# EDGAR Filing Document

**Accession Number:** 0000276776
**File Stem:** 0001193125-23-064070
**Filing Date:** 2023-3
**Character Count:** 551569
**Document Hash:** 6a19cd3e56b849f72b37ed3dcf36b7fe
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-23-064070.hdr.sgml**: 20230308

**ACCESSION NUMBER**: 0001193125-23-064070

**CONFORMED SUBMISSION TYPE**: N-CSRS

**PUBLIC DOCUMENT COUNT**: 12

**CONFORMED PERIOD OF REPORT**: 20221231

**FILED AS OF DATE**: 20230308

**DATE AS OF CHANGE**: 20230308

**EFFECTIVENESS DATE**: 20230308

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** PIONEER BOND FUND /DE/
- **CENTRAL INDEX KEY:** 0000276776
- **IRS NUMBER:** 042652279
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 0630

**FILING VALUES:**
- **FORM TYPE:** N-CSRS
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-02864
- **FILM NUMBER:** 23715231

**BUSINESS ADDRESS:**
- **STREET 1:** 60 STATE ST 5TH FL
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02109
- **BUSINESS PHONE:** 617-742-7825

**MAIL ADDRESS:**
- **STREET 1:** 60 STATE ST
- **STREET 2:** 5TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02109-1820

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** PIONEER BOND FUND /MA/
- **DATE OF NAME CHANGE:** 19920703

## Series and Classes Contracts Data

### Pioneer Bond Fund (Series ID: S000003927)

| Class ID   | Class Name                 | Ticker Symbol   |
|:---|:---|:---|
| C000011026 | Pioneer Bond Fund: Class A | PIOBX           |
| C000011028 | Pioneer Bond Fund: Class C | PCYBX           |
| C000011029 | Pioneer Bond Fund: Class Y | PICYX           |
| C000011031 | Pioneer Bond Fund: Class R | PBFRX           |
| C000123839 | Pioneer Bond Fund: Class K | PBFKX           |

------

------

**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 811-02864** 

------

## Pioneer Bond Fund
**(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: December 31, 2022** 

**Date of reporting period: July 1, 2022 through December 31, 2022** 

------

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.

------

Semiannual Report \| December 31, 2022

---

| | | | | |
|:---|:---|:---|:---|:---|
| **A: PIOBX** | **C: PCYBX** | **K: PBFKX** | **R: PBFRX** | **Y: PICYX** |

---

![](g470498img99bde61b1.gif)

------

visit us: www.amundi.com/us

------

### **Table of Contents**

------

---

| | |
|:---|:---|
| [President's Letter](#xx_de90b8ab-94b1-4385-9b17-6a78762e0b9c_1) | 2 |
| [Portfolio Management Discussion](#xx_c5787e34-8de8-4a94-a1c9-222ef6986820_1) | 4 |
| [Portfolio Summary](#xx_695c0322-1091-4f2f-8d09-9c6579cfe5b2_1) | 12 |
| [Prices and Distributions](#xx_53ee0d99-b07e-4377-a6fd-5dfde83be491_1) | 13 |
| [Performance Update](#xx_0f113444-8702-49c0-af1c-367c311afa5b_1) | 14 |
| [Comparing Ongoing Fund Expenses](#xx_2e600233-75eb-4df5-97f5-c1b2b9f93322_1) | 19 |
| [Schedule of Investments](#xx_5cdd1d65-94b0-467b-a7b0-df5ef9858ff8_1) | 21 |
| [Financial Statements](#xx_7e3805cc-ecbc-47d4-bfd7-81af6e263805_1) | 102 |
| [Notes to Financial Statements](#xx_6b91d10a-49dd-4523-ad14-487c691a7608_1) | 111 |
| [Approval of Renewal of Investment Management Agreement](#xx_53b78d45-7594-4ea5-b9ba-ccb96f40ec39_1) | 130 |
| [Trustees, Officers and Service Providers](#xx_cdb03185-13c2-4983-bf8b-a1e727933c58_1) | 135 |

---

Pioneer Bond Fund \| Semiannual Report \| 12/31/221

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

### President's Letter
Dear Shareholders,

On February 13, 2023 Amundi US celebrated the 95<sup>th</sup> 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, the father 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 philosophy, Pioneer Fund focuses on investing in what the managers believe are high-quality companies with sustainable business models and attractive long-term growth and income potential across the spectrum of large-cap growth and value companies. The current portfolio management team is led by Jeff Kripke, who has been in that role since 2015. Employing many of the same techniques utilized in the 1920s, Jeff and his team 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, not just in managing Pioneer Fund, but across all of our portfolios – can help mitigate the risks 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.

2Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

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

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

![](g470498img4cea57722.jpg)

Lisa M. Jones<br> Head of the Americas, President and CEO of US<br> Amundi Asset Management US, Inc.<br> February 2023

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/223

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

### Portfolio Management Discussion \| 12/31/22
*In the following interview, Brad Komenda discusses the factors that affected the performance of Pioneer Bond Fund during the six-month period ended December 31, 2022. Mr. Komenda, a Managing Director and Director of Investment-Grade Corporates, and a portfolio manager at Amundi Asset Management US, Inc. (Amundi US), is responsible for the daily management of the Portfolio, along with Kenneth J. Taubes, Executive Vice President and Chief Investment Officer, US, and a portfolio manager at Amundi US, Timothy Rowe, Managing Director, Director of Multisector Fixed Income, and a portfolio manager at Amundi US, and Jonathan Scott, a senior vice president, Deputy Director of Multi-Sector Fixed Income, and a portfolio manager at Amundi US.*

---

| | |
|:---|:---|
| **Q** | **How did the Fund perform during the six-month period ended December 31, 2022?** |
| **A** | Pioneer Bond Fund's Class A shares returned -4.31% at net asset value during the six-month period ended December 31, 2022, while the Fund's benchmark, the Bloomberg US Aggregate Bond Index, returned -2.97%. During the same six-month period, the average return of the 640 mutual funds in Morningstar's Intermediate Core-Plus Bond Funds Category was -2.64%. |
| **Q** | **How would you describe the investment environment in the fixed-income markets during the six-month period ended December 31, 2022?** |
| **A** | Entering the period in July 2022, the prospect of continued tightening of monetary policy by central banks dominated the market's focus. With data showing that US year-over-year consumer price inflation had reached a new high of 9.1% in June, expectations were that the Federal Reserve (Fed) would continue to aggressively raise its benchmark overnight lending (federal funds) rate's target range. Indeed, the Fed, after beginning to raise rates gradually in March and May, implemented successive 75-basis point (bps) increases in the federal funds rate target range at its July and September meetings. (A basis point is equal to 1/100<sup>th</sup> of a percentage point). Those actions by the Fed weighed on investors' sentiment towards credit-sensitive securities and drove down fixed-income market returns on a broad scale. |
|  | As post-June inflation data showed signs of modest easing, investors began to anticipate a pivot by the Fed to a more dovish |

---

4Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| |
|:---|
| policy stance, leading to strong fixed-income market returns in October and November, despite another 75 bps increase in the federal funds target range by the Fed in early November. However, the market's focus soon turned to the potential recessionary effects of the higher interest-rate regime already put in place by the Fed, leading riskier assets such as equities and corporate bonds to retrace some of their earlier fourth-quarter gains over the month of December. The Fed implemented a more modest 50 bps increase to the federal funds target range at its December meeting, leaving the target range at 4.25%‒4.50% at the end of 2022, the highest level since the fall of 2007. |
| Against this backdrop, the US Treasury yield curve moved higher, with yield increases the most significant for securities with shorter maturities as the market priced in the Fed's rate increases. For the six-month period ended December 31, 2022, the two-year Treasury yield finished 149 bps higher than where it began the period, increasing from 2.92% to 4.41%, while the 10-year Treasury yield rose a more modest 90 bps over the six-month period, from 2.98% to 3.88%, and the 30-year Treasury yield rose 83 bps, from 3.14% to 3.97%. (A yield curve is a line that plots the interest rates, at a set point in time, of bonds having equal credit quality but differing maturity dates.) |
| Those yield moves resulted in the Treasury yield curve becoming significantly inverted by the end of 2022 (meaning that short-term yields were higher than long-term yields), a development commonly viewed as a recession precursor/predictor. |
| The upward move in interest rates weighed on fixed-income market returns for the full six-month period. The investment-grade corporate bond market, as gauged by the Bloomberg US Aggregate Bond Index (the Bloomberg Index), the Fund's benchmark, posted a return of -2.97% for the period. While all sectors within the benchmark finished the period in negative territory, the returns for corporate bonds was notably better than returns for both securitized assets and Treasuries. Below-investment-grade, high-yield corporate bonds, which have tended to be less interest-rate-sensitive, returned 3.50% for the period, on the strength of credit-spread tightening during the |

---

Pioneer Bond Fund \| Semiannual Report \| 12/31/225

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | |
|:---|:---|
|  | fourth quarter of 2022. (Credit spreads are commonly defined as the differences in yield between Treasuries and other types of fixed-income securities with similar maturities.) |
| **Q** | **What factors influenced the Fund's performance relative to the Bloomberg Barclays Index during the six-month period ended December 31, 2022?** |
| **A** | The Fund's tactical positioning along the yield curve weighed on benchmark-relative returns over the six-month period. Specifically, the Fund was overweight to the long end of the curve, which underperformed as US Treasury yields moved higher, due to the long end's greater sensitivity to changes in interest rates. |
|  | Sector allocation results were another detractor from the Fund's relative performance, most notably, the portfolio's overweights to non-agency mortgage-backed securities (MBS) and commercial MBS (CMBS). Credit concerns and an imbalance between supply and demand weighed on the performance of non-agency MBS during the period, while investors' sentiment with respect to CMBS weakened on fears of impairments in underlying collateral in the event of a recession. The negative effects on the Fund's relative returns from the portfolio's allocations to those securitized sectors were offset, in part, by an underweight to US Treasuries, which experienced rising yields and corresponding price weakness (bond prices and yields tend to move in opposite directions). |
|  | On the positive side, within the Fund's allocation to agency MBS, an overweight to higher-coupon pools modestly supported relative returns, as higher-coupon MBS have tended to be less sensitive to prepayment risk, and they outperformed over the period as mortgage rates rose and mortgage durations extended for lower-coupon pools. (Prepayment risk is the risk involved with the premature return of principal on a fixed-income security. When principal is returned early, future interest payments will not be paid on that part of the principal.) |
|  | The Fund's positioning within corporate credit also proved additive to benchmark-relative returns, with an overweight to financials and a focus on lower-quality issues within industrials the key positive contributors in that area. In both cases, |

---

6Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | |
|:---|:---|
|  | benchmark-relative performance benefited from narrowing credit spreads. However, those positives were largely offset by underperformance of the portfolio's holdings of index-based, high-yield credit-default-swap contracts (CDX), which we utilized in an effort to hedge credit risk in the portfolio. As spreads tightened over the period, and high-yield bond prices rose, the Fund's short exposure to high yield via the CDX positions had a negative effect on relative performance. |
| **Q** | **Did the Fund have any investments in derivative securities during the 12-month period? If so, did the derivatives have any material impact on performance?** |
| **A** | Yes, we invested the Fund in Treasury futures and CDX (as noted earlier). We have used Treasury futures as part of our duration-management strategy for the portfolio. We believe the use of Treasury futures has allowed us to express our views on duration and yield-curve positioning in the most efficient manner. (Duration is a measure of the sensitivity of the price, or the value of principal, of a fixed-income investment to a change in interest rates, expressed as a number of years.) |
|  | We typically have used the CDX positions as part of our efforts to either gain or reduce the Fund's exposures to both investment-grade and high-yield corporate securities efficiently, as cash-bond transactions take a little more time to execute, and have a higher liquidity cost. The use of derivatives, we think, may allow the Fund to potentially benefit from the performance effects of the targeted asset class, while retaining a better liquidity profile, which may help reduce risk. Treasury futures, which we typically utilize to help managed the portfolio's yield-curve and duration positioning, had a slightly negative effect on the Fund's relative |

---

Pioneer Bond Fund \| Semiannual Report \| 12/31/227

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | |
|:---|:---|
|  | returns during the period. The CDX positions, as discussed previously, had a negative effect on the Fund's relative returns over the six-month period. |
| **Q** | **What factors affected the Fund's yield, or distributions\* to shareholders, during the six-month period ended December 31, 2022?** |
| **A** | The Fund's monthly distribution rate increased during the six-month period as rising Treasury yields more than offset the modest narrowing in corporate credit spreads. Spreads for securitized sectors modestly widened during the period, which further benefited the Fund's yield. |
| **Q** | **What is your investment outlook and how is the Fund positioned?** |
| **A** | The US macroeconomic situation remains highly unusual, in our view, due to the lingering effects of COVID-19-related changes in consumption, production, and supply chains. As consumption has continued to shift away from goods to services and as supply chains have continued to normalize, manufacturing has slowed overall. Supply-chain disruptions have decreased significantly, but backlogs remain for many products. At the same time, the domestic job market has remained overheated, with job openings far in excess of available workers. Inflation has remained well above the Fed's longer-run goal of 2%, and wage growth has been above levels consistent with that inflation target. The Fed has continued to focus on cooling the labor market to bring wage inflation down, and likely hopes that it can do so without tipping the economy into recession. However, we believe the path to such a "soft landing" for the economy remains extremely narrow. |
|  | We believe clarity on when the Fed will eventually pause its rate-hiking cycle could boost investor demand for US fixed-income assets in general, and provide a tailwind for fixed-income market returns, based on both spread tightening in the securitized and financials sectors as well as declining interest rates over the near term. With that said, we still see elevated risk for a possible Fed policy mistake later this year, which could lead to a recession, and so we believe that a strong focus on credit selection remains critical. As of period-end, we had moved the portfolio from a |

---

**\*** **Distributions are not guaranteed.** 

8Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| |
|:---|
| relatively neutral-duration stance versus the benchmark to a modest long-duration stance. |
| Within the corporate credit segment, we have continued to favor investments in the financials sector, and banks, in particular, as we feel valuations there are historically dislocated relative to the industrials sector. We have maintained a meaningfully higher credit-quality profile in the portfolio than we normally have over time (still higher than the benchmark's), due to what we view as poor valuations and the potential for a slowing economy. |

---

Pioneer Bond Fund \| Semiannual Report \| 12/31/229

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

#### Please refer to the Schedule of Investments on pages 21-101 for a full listing of Fund securities.
**All investments are subject to risk, including the possible loss of principal. In the past several years, financial markets have experienced increased volatility and heightened uncertainty. The market prices of securities may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic, political, or regulatory conditions, recessions, inflation, changes in interest or currency rates, lack of liquidity in the bond markets, the spread of infectious illness or other public health issues, armed conflict including Russia's military invasion of Ukraine, sanctions against Russia, other nations or individuals or companies and possible countermeasures, market disruptions caused by tariffs, trade disputes or other government actions, or adverse investor sentiment. These conditions may continue, recur, worsen or spread.**

**The Fund'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). Plans are underway to phase out the use of LIBOR. There remains uncertainty regarding the nature of any replacement rate and the impact of the transition from LIBOR on the Fund, issuers of instruments in which the Fund invests, and financial markets generally.**

**The market price of securities may fluctuate when interest rates change. When interest rates rise, the prices of fixed income securities in the Fund will generally fall. Conversely, when interest rates fall, the prices of fixed income securities in the Fund will generally rise.**

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

**Prepayment risk is the chance that an issuer may exercise its right to prepay its security, if falling interest rates prompt the issuer to do so. Forced to reinvest the unanticipated proceeds at lower interest rates, the Fund would experience a decline in income and lose the opportunity for additional price appreciation.**

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

#### The securities issued by U.S. Government-sponsored entities (e.g., FNMA, Freddie Mac) are neither guaranteed nor issued by the U.S. Government.
10Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

**The Fund may invest in mortgage-backed securities, which during times of fluctuating interest rates may increase or decrease more than other fixed income securities. Mortgage-backed securities are also subject to pre-payments.**

***Before investing, consider the product's investment objectives, risks, charges and expenses. Contact your financial professional or Amundi Asset Management US, Inc., for a prospectus or summary prospectus containing this information. Read it carefully.***

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2211

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

Portfolio Summary \| 12/31/22

#### Portfolio Diversification

------

(As a percentage of total investments)\*

![](g470498img3b9786993.jpg)

#### 10 Largest Holdings

------

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;(As a percentage of total investments)\* | &nbsp;&nbsp;(As a percentage of total investments)\* | &nbsp;&nbsp;(As a percentage of total investments)\* |
| &nbsp;&nbsp;1. | &nbsp;&nbsp;U.S. Treasury Bills, 1/10/23 | &nbsp;&nbsp;3.51% |
| &nbsp;&nbsp;2. | &nbsp;&nbsp;U.S. Treasury Bonds, 2.875%, 5/15/52 | &nbsp;&nbsp;3.38 |
| &nbsp;&nbsp;3. | &nbsp;&nbsp;U.S. Treasury Bonds, 2.25%, 2/15/52 | &nbsp;&nbsp;2.93 |
| &nbsp;&nbsp;4. | &nbsp;&nbsp;Federal National Mortgage Association, 2.50%, 1/1/53 (TBA) | &nbsp;&nbsp;1.56 |
| &nbsp;&nbsp;5. | &nbsp;&nbsp;Federal National Mortgage Association, 2.00%, 1/1/53 (TBA) | &nbsp;&nbsp;1.21 |
| &nbsp;&nbsp;6. | &nbsp;&nbsp;Federal National Mortgage Association, 6.00%, 12/1/52 | &nbsp;&nbsp;1.05 |
| &nbsp;&nbsp;7. | &nbsp;&nbsp;Government National Mortgage Association II, 3.00%, 5/20/52 | &nbsp;&nbsp;1.00 |
| &nbsp;&nbsp;8. | &nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.00%, 4/1/52 | &nbsp;&nbsp;0.92 |
| &nbsp;&nbsp;9. | &nbsp;&nbsp;U.S. Treasury Bills, 1/24/23 | &nbsp;&nbsp;0.91 |
| &nbsp;&nbsp;10. | &nbsp;&nbsp;Federal National Mortgage Association, 2.50%, 5/1/51 | &nbsp;&nbsp;0.78 |

---

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

12Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

### Prices and Distributions \| 12/31/22

#### Net Asset Value per Share

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Class** | &nbsp;&nbsp;**12/31/22** | &nbsp;&nbsp;**6/30/22** |
| &nbsp;&nbsp;A | &nbsp;&nbsp;$8.13 | &nbsp;&nbsp;$8.60 |
| &nbsp;&nbsp;C | &nbsp;&nbsp;$8.03 | &nbsp;&nbsp;$8.51 |
| &nbsp;&nbsp;K | &nbsp;&nbsp;$8.12 | &nbsp;&nbsp;$8.60 |
| &nbsp;&nbsp;R | &nbsp;&nbsp;$8.20 | &nbsp;&nbsp;$8.68 |
| &nbsp;&nbsp;Y | &nbsp;&nbsp;$8.05 | &nbsp;&nbsp;$8.51 |

---

#### Distributions per Share: 7/1/22 - 12/31/22

---

| | | | |
|:---|:---|:---|:---|
| &nbsp;&nbsp;**Class** | &nbsp;&nbsp;**Net <br> Investment<br> Income** | &nbsp;&nbsp;**Short-Term <br> Capital Gains** | &nbsp;&nbsp;**Long-Term <br> Capital Gains** |
| &nbsp;&nbsp;A | &nbsp;&nbsp;$0.1006 | &nbsp;&nbsp;$— | &nbsp;&nbsp;$— |
| &nbsp;&nbsp;C | &nbsp;&nbsp;$0.0735 | &nbsp;&nbsp;$— | &nbsp;&nbsp;$— |
| &nbsp;&nbsp;K | &nbsp;&nbsp;$0.1205 | &nbsp;&nbsp;$— | &nbsp;&nbsp;$— |
| &nbsp;&nbsp;R | &nbsp;&nbsp;$0.0891 | &nbsp;&nbsp;$— | &nbsp;&nbsp;$— |
| &nbsp;&nbsp;Y | &nbsp;&nbsp;$0.1143 | &nbsp;&nbsp;$— | &nbsp;&nbsp;$— |

---

#### Index Definition
The **Bloomberg U.S. Aggregate Bond Index** is an unmanaged measure of the US bond market. Index returns are calculated monthly, assume reinvestment of dividends and do not reflect any fees, expenses or sales charges. It is not possible to invest directly in an index.

The index defined here pertains to the "Value of $10,000 Investment" and "Value of $5 Million Investment" charts on pages 14-18.

Pioneer Bond Fund \| Semiannual Report \| 12/31/2213

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | |
|:---|:---|
| **Performance Update \| 12/31/22** | **Class A Shares** |

---

#### Investment Returns

------

The mountain chart on the right shows the change in value of a $10,000 investment made in Class A shares of Pioneer Bond Fund at public offering price during the periods shown, compared to that of the Bloomberg U.S. Aggregate Bond Index.

---

| | | | |
|:---|:---|:---|:---|
| &nbsp;&nbsp;**Average Annual Total Returns<br> (As of December 31, 2022)** | &nbsp;&nbsp;**Average Annual Total Returns<br> (As of December 31, 2022)** | &nbsp;&nbsp;**Average Annual Total Returns<br> (As of December 31, 2022)** | &nbsp;&nbsp;**Average Annual Total Returns<br> (As of December 31, 2022)** |
| &nbsp;&nbsp;**Period** | &nbsp;&nbsp;**Net <br> Asset<br> Value<br> (NAV)** | &nbsp;&nbsp;**Public <br> Offering<br> Price<br> (POP)** | &nbsp;&nbsp;**Bloomberg <br> U.S.<br> Aggregate<br> Bond<br> Index** |
| &nbsp;&nbsp;10 Years | &nbsp;&nbsp;&nbsp;&nbsp;1.49% | &nbsp;&nbsp;&nbsp;&nbsp;1.02% | &nbsp;&nbsp;&nbsp;&nbsp;1.06% |
| &nbsp;&nbsp;5 Years | &nbsp;&nbsp;&nbsp;&nbsp;0.09 | &nbsp;&nbsp;&nbsp;-0.83 | &nbsp;&nbsp;&nbsp;&nbsp;0.02 |
| &nbsp;&nbsp;1 Year | &nbsp;&nbsp;-14.60 | &nbsp;&nbsp;-18.46 | &nbsp;&nbsp;-13.01 |

---

---

| |
|:---|
| &nbsp;&nbsp;**Expense Ratio<br> (Per prospectus dated November 1, 2022)** |
| &nbsp;&nbsp;**Gross** |
| &nbsp;&nbsp;0.79% |

---

#### Value of $10,000 Investment
![](g470498imge45539a24.jpg)

#### Call 1-800-225-6292 or visit www.amundi.com/us for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted.
**The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost.**

NAV results represent the percent change in net asset value per share. NAV returns would have been lower had sales charges been reflected. POP returns reflect deduction of maximum 4.50% sales charge. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ.

Performance results reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information.

The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares.

Please refer to the financial highlights for a more current expense ratio.

14Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | |
|:---|:---|
| **Performance Update \| 12/31/22** | **Class C Shares** |

---

#### Investment Returns

------

The mountain chart on the right shows the change in value of a $10,000 investment made in Class C shares of Pioneer Bond Fund during the periods shown, compared to that of the Bloomberg U.S. Aggregate Bond Index.

---

| | | | |
|:---|:---|:---|:---|
| &nbsp;&nbsp;**Average Annual Total Returns<br> (As of December 31, 2022)** | &nbsp;&nbsp;**Average Annual Total Returns<br> (As of December 31, 2022)** | &nbsp;&nbsp;**Average Annual Total Returns<br> (As of December 31, 2022)** | &nbsp;&nbsp;**Average Annual Total Returns<br> (As of December 31, 2022)** |
| &nbsp;&nbsp;**Period** | &nbsp;&nbsp;**If <br> Held** | &nbsp;&nbsp;**If <br> Redeemed** | &nbsp;&nbsp;**Bloomberg <br> U.S.<br> Aggregate<br> Bond<br> Index** |
| &nbsp;&nbsp;10 Years | &nbsp;&nbsp;&nbsp;&nbsp;0.75% | &nbsp;&nbsp;&nbsp;&nbsp;0.75% | &nbsp;&nbsp;&nbsp;&nbsp;1.06% |
| &nbsp;&nbsp;5 Years | &nbsp;&nbsp;&nbsp;-0.58 | &nbsp;&nbsp;&nbsp;-0.58 | &nbsp;&nbsp;&nbsp;&nbsp;0.02 |
| &nbsp;&nbsp;1 Year | &nbsp;&nbsp;-15.23 | &nbsp;&nbsp;-16.07 | &nbsp;&nbsp;-13.01 |

---

---

| |
|:---|
| &nbsp;&nbsp;**Expense Ratio<br> (Per prospectus dated November 1, 2022)** |
| &nbsp;&nbsp;**Gross** |
| &nbsp;&nbsp;1.43% |

---

#### Value of $10,000 Investment
![](g470498imga6364f1b5.jpg)

#### Call 1-800-225-6292 or visit www.amundi.com/us for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted.
**The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost.**

Class C shares held for less than one year are also subject to a 1% contingent deferred sales charge (CDSC). "If Held" results represent the percent change in net asset value per share. "If Redeemed" returns reflect deduction of the CDSC for the one-year period, assuming a complete redemption of shares at the last price calculated on the last business day of the period, and no CDSC for the five- and 10-year periods. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ.

Performance results reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information.

The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares.

Please refer to the financial highlights for a more current expense ratio.

Pioneer Bond Fund \| Semiannual Report \| 12/31/2215

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | |
|:---|:---|
| **Performance Update \| 12/31/22** | **Class K Shares** |

---

#### Investment Returns

------

The mountain chart on the right shows the change in value of a $5 million investment made in Class K shares of Pioneer Bond Fund during the periods shown, compared to that of the Bloomberg U.S. Aggregate Bond Index.

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Average Annual Total Returns<br> (As of December 31, 2022)** | &nbsp;&nbsp;**Average Annual Total Returns<br> (As of December 31, 2022)** | &nbsp;&nbsp;**Average Annual Total Returns<br> (As of December 31, 2022)** |
| &nbsp;&nbsp;**Period** | &nbsp;&nbsp;**Net <br> Asset<br> Value<br> (NAV)** | &nbsp;&nbsp;**Bloomberg <br> U.S.<br> Aggregate<br> Bond<br> Index** |
| &nbsp;&nbsp;10 Years | &nbsp;&nbsp;&nbsp;&nbsp;1.90% | &nbsp;&nbsp;&nbsp;&nbsp;1.06% |
| &nbsp;&nbsp;5 Years | &nbsp;&nbsp;&nbsp;&nbsp;0.53 | &nbsp;&nbsp;&nbsp;&nbsp;0.02 |
| &nbsp;&nbsp;1 Year | &nbsp;&nbsp;-14.29 | &nbsp;&nbsp;-13.01 |

---

---

| |
|:---|
| &nbsp;&nbsp;**Expense Ratio<br> (Per prospectus dated November 1, 2022)** |
| &nbsp;&nbsp;**Gross** |
| &nbsp;&nbsp;0.33% |

---

#### Value of $5 Million Investment
![](g470498imgdd8280786.jpg)

#### Call 1-800-225-6292 or visit www.amundi.com/us for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted.
**The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost.**

The performance shown for Class K shares for the period prior to the commencement of operations of Class K shares on December 20, 2012, is the net asset value performance of the Fund's Class A shares, which has not been restated to reflect any differences in expenses, including Rule 12b-1 fees applicable to Class A shares. Since fees for Class A shares generally are higher than those of Class K shares, the performance of Class K shares prior to their inception, would have been higher than the performance shown. Class K shares are not subject to sales charges and are available for limited groups of eligible investors, including institutional investors. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ.

Performance results reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information.

The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares.

Please refer to the financial highlights for a more current expense ratio.

16Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | |
|:---|:---|
| **Performance Update \| 12/31/22** | **Class R Shares** |

---

#### Investment Returns

------

The mountain chart on the right shows the change in value of a $10,000 investment made in Class R shares of Pioneer Bond Fund during the periods shown, compared to that of the Bloomberg U.S. Aggregate Bond Index.

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Average Annual Total Returns<br> (As of December 31, 2022)** | &nbsp;&nbsp;**Average Annual Total Returns<br> (As of December 31, 2022)** | &nbsp;&nbsp;**Average Annual Total Returns<br> (As of December 31, 2022)** |
| &nbsp;&nbsp;**Period** | &nbsp;&nbsp;**Net <br> Asset<br> Value<br> (NAV)** | &nbsp;&nbsp;**Bloomberg <br> U.S.<br> Aggregate<br> Bond<br> Index** |
| &nbsp;&nbsp;10 Years | &nbsp;&nbsp;&nbsp;&nbsp;1.21% | &nbsp;&nbsp;&nbsp;&nbsp;1.06% |
| &nbsp;&nbsp;5 Years | &nbsp;&nbsp;&nbsp;-0.19 | &nbsp;&nbsp;&nbsp;&nbsp;0.02 |
| &nbsp;&nbsp;1 Year | &nbsp;&nbsp;-14.89 | &nbsp;&nbsp;-13.01 |

---

---

| |
|:---|
| &nbsp;&nbsp;**Expense Ratio<br> (Per prospectus dated November 1, 2022)** |
| &nbsp;&nbsp;**Gross** |
| &nbsp;&nbsp;1.07% |

---

#### Value of $10,000 Investment
![](g470498img562b9e717.jpg)

#### Call 1-800-225-6292 or visit www.amundi.com/us for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted.
**The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost.**

Class R shares are not subject to sales charges and are available for limited groups of eligible investors, including institutional investors. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ.

Performance results reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information.

The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares.

Please refer to the financial highlights for a more current expense ratio.

Pioneer Bond Fund \| Semiannual Report \| 12/31/2217

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | |
|:---|:---|
| **Performance Update \| 12/31/22** | **Class Y Shares** |

---

#### Investment Returns

------

The mountain chart on the right shows the change in value of a $5 million investment made in Class Y shares of Pioneer Bond Fund during the periods shown, compared to that of the Bloomberg U.S. Aggregate Bond Index.

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Average Annual Total Returns<br> (As of December 31, 2022)** | &nbsp;&nbsp;**Average Annual Total Returns<br> (As of December 31, 2022)** | &nbsp;&nbsp;**Average Annual Total Returns<br> (As of December 31, 2022)** |
| &nbsp;&nbsp;**Period** | &nbsp;&nbsp;**Net <br> Asset<br> Value<br> (NAV)** | &nbsp;&nbsp;**Bloomberg <br> U.S.<br> Aggregate<br> Bond<br> Index** |
| &nbsp;&nbsp;10 Years | &nbsp;&nbsp;&nbsp;&nbsp;1.79% | &nbsp;&nbsp;&nbsp;&nbsp;1.06% |
| &nbsp;&nbsp;5 Years | &nbsp;&nbsp;&nbsp;&nbsp;0.44 | &nbsp;&nbsp;&nbsp;&nbsp;0.02 |
| &nbsp;&nbsp;1 Year | &nbsp;&nbsp;-14.24 | &nbsp;&nbsp;-13.01 |

---

---

| |
|:---|
| &nbsp;&nbsp;**Expense Ratio<br> (Per prospectus dated November 1, 2022)** |
| &nbsp;&nbsp;**Gross** |
| &nbsp;&nbsp;0.44% |

---

#### Value of $5 Million Investment
![](g470498img053de1558.jpg)

#### Call 1-800-225-6292 or visit www.amundi.com/us for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted.
**The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost.**

Class Y shares are not subject to sales charges and are available for limited groups of eligible investors, including institutional investors. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ.

Performance results reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information.

The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares.

Please refer to the financial highlights for a more current expense ratio.

18Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

Comparing Ongoing Fund Expenses

As a shareowner in the Fund, you incur two types of costs:

(1) ongoing costs, including
management fees, distribution and/or service (12b-1) fees, and other Fund expenses; and

(2) transaction costs,
 including sales charges (loads) on purchase payments.

This example is intended to help you understand your ongoing expenses (in dollars) of investing in the Fund and to compare these costs with the ongoing costs of investing in other mutual funds. The example is based on an investment of $1,000 at the beginning of the Fund's latest six-month period and held throughout the six months.

#### Using the Tables

------

#### Actual Expenses
The first table below provides information about actual account values and actual expenses. You may use the information in this table, together with the amount you invested, to estimate the expenses that you paid over the period as follows:

(1) Divide your account value by
$1,000<br> 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 Bond Fund
Based on actual returns from July 1, 2022 through December 31, 2022.

---

| | | | | | |
|:---|:---|:---|:---|:---|:---|
| &nbsp;&nbsp;**Share Class** | **A** | &nbsp;&nbsp;&nbsp;&nbsp;**C** | &nbsp;&nbsp;&nbsp;&nbsp;**K** | &nbsp;&nbsp;&nbsp;&nbsp;**R** | &nbsp;&nbsp;&nbsp;&nbsp;**Y** |
| &nbsp;&nbsp;Beginning Account<br> Value on 7/1/22 | $1000.00 | &nbsp;&nbsp;&nbsp;&nbsp;$1000.00 | &nbsp;&nbsp;&nbsp;&nbsp;$1000.00 | &nbsp;&nbsp;&nbsp;&nbsp;$1000.00 | &nbsp;&nbsp;&nbsp;&nbsp;$1000.00 |
| &nbsp;&nbsp;Ending Account Value<br> (after expenses) on 12/31/22 | &nbsp;&nbsp;&nbsp;&nbsp;$956.90 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$952.10 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$958.00 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$954.90 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$959.30 |
| &nbsp;&nbsp;Expenses Paid<br> During Period\* | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$4.09 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$7.23 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$1.73 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$5.42 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$2.37 |

---

\* Expenses are equal to the Fund's annualized expense ratio of 0.83%, 1.47%, 0.35%, 1.10%, and 0.48% for Class A, Class C, Class K, Class R, and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 184/365 (to reﬂect the partial year period).

Pioneer Bond Fund \| Semiannual Report \| 12/31/2219

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

Comparing Ongoing Fund Expenses (continued)

#### Hypothetical Example for Comparison Purposes
The table below provides information about hypothetical account values and hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not the Fund's actual return. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period.

You may use this information to compare the ongoing costs of investing in the Fund and other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of the other funds.

Please note that the expenses shown in the tables are meant to highlight your ongoing costs only and do not reflect any transaction costs, such as sales charges (loads) that are charged at the time of the transaction. Therefore, the table below is useful in comparing ongoing costs only and will not help you determine the relative total costs of owning different funds. In addition, if these transaction costs were included, your costs would have been higher.

#### Expenses Paid on a $1,000 Investment in Pioneer Bond Fund
Based on a hypothetical 5% return per year before expenses, reflecting the period from July 1, 2022 through December 31, 2022.

---

| | | | | | |
|:---|:---|:---|:---|:---|:---|
| &nbsp;&nbsp;**Share Class** | **A** | &nbsp;&nbsp;&nbsp;&nbsp;**C** | &nbsp;&nbsp;&nbsp;&nbsp;**K** | &nbsp;&nbsp;&nbsp;&nbsp;**R** | &nbsp;&nbsp;&nbsp;&nbsp;**Y** |
| &nbsp;&nbsp;Beginning Account<br> Value on 7/1/22 | $1000.00 | &nbsp;&nbsp;&nbsp;&nbsp;$1000.00 | &nbsp;&nbsp;&nbsp;&nbsp;$1000.00 | &nbsp;&nbsp;&nbsp;&nbsp;$1000.00 | &nbsp;&nbsp;&nbsp;&nbsp;$1000.00 |
| &nbsp;&nbsp;Ending Account Value<br> (after expenses) on 12/31/22 | $1021.02 | &nbsp;&nbsp;&nbsp;&nbsp;$1017.80 | &nbsp;&nbsp;&nbsp;&nbsp;$1023.44 | &nbsp;&nbsp;&nbsp;&nbsp;$1019.66 | &nbsp;&nbsp;&nbsp;&nbsp;$1022.79 |
| &nbsp;&nbsp;Expenses Paid<br> During Period\* | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$4.23 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$7.48 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$1.79 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$5.60 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$2.45 |

---

\* Expenses are equal to the Fund's annualized expense ratio of 0.83%, 1.47%, 0.35%, 1.10%, and 0.48% for Class A, Class C, Class K, Class R, and Class Y shares, respectively, multiplied by the average account value over the period, multiplied by 184/365 (to reﬂect the partial year period).

20Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

### Schedule of Investments \| 12/31/22
(unaudited)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**UNAFFILIATED ISSUERS — 102.6%** |  |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Senior Secured Floating Rate Loan<br> Interests — 0.4% of Net Assets\*(a)** |  |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Chemicals-Diversified — 0.1%** |  |
| 1404387 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;LSF11 A5 HoldCo LLC, Term Loan, 7.938% (Term SOFR + 350 bps), 10/15/28 | $1358745 |
| 4299525 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Mativ Holdings, Inc., Term B Loan, 8.188% (Term SOFR + 375 bps), 4/20/28 | &nbsp;&nbsp; 4084549 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Chemicals-Diversified** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **5443294** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Electric-Generation — 0.0%†** |  |
| 317551 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Eastern Power LLC (Eastern Covert Midco LLC), Term Loan, 8.48% (LIBOR + 375 bps), 10/2/25 | $283116 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Electric-Generation** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **283116** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Electronic Composition — 0.0%†** |  |
| 1011313 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Energy Acquisition LP, First Lien Initial Term Loan, 8.634% (LIBOR + 425 bps), 6/26/25 | $912395 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Electronic Composition** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **912395** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Finance-Leasing Company — 0.0%†** |  |
| 614493 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Avolon TLB Borrower 1 (US) LLC, Term B-4 Loan, 5.853% (LIBOR + 150 bps), 2/12/27 | $607538 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Finance-Leasing Company** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **607538** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Medical-Wholesale Drug Distribution — 0.1%** |  |
| 2198388 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Owens & Minor, Inc., Term B-1 Loan, 8.173% (Term SOFR + 375 bps), 3/29/29 | $2203883 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Medical-Wholesale Drug Distribution** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **2203883** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Metal Processors & Fabrication — 0.1%** |  |
| 3480938 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Grinding Media, Inc. (Molycop, Ltd.), First Lien Initial Term Loan, 8.765% (LIBOR + 400 bps), 10/12/28 | $3254676 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Metal Processors & Fabrication** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **3254676** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Physical Practice Management — 0.0%†** |  |
| 926185 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Team Health Holdings, Inc., Extended Term Loan, 9.573% (Term SOFR + 525 bps), 3/2/27 | $702743 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Physical Practice Management** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **702743** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Recreational Centers — 0.0%†** |  |
| 190787 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Fitness International LLC, Term B Loan, 7.494% (Term SOFR + 325 bps), 4/18/25 | $176776 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Recreational Centers** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **176776** |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2221

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Rental Auto & Equipment — 0.0%†** |  |
| 1108800 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;PECF USS Intermediate Holding III Corp., Initial Term Loan, 8.634% (LIBOR + 425 bps), 12/15/28 | $928505 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Rental Auto & Equipment** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **928505** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Retail — 0.0%†** |  |
| 345904 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Staples, Inc., 2019 Refinancing New Term B-2 Loan, 8.94% (LIBOR + 450 bps), 9/12/24 | $340553 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Retail** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **340553** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Retail-Restaurants — 0.1%** |  |
| 1372987 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1011778 B.C. Unlimited Liability Co., Term B-4 Loan, 6.165% (LIBOR + 175 bps), 11/19/26 | $1351105 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Retail-Restaurants** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **1351105** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Schools — 0.0%†** |  |
| 1058219 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;KUEHG Corp. (fka KC MergerSub, Inc.), Term B-3 Loan, 8.48% (LIBOR + 375 bps), 2/21/25 | $1019032 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Schools** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **1019032** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Telephone-Integrated — 0.0%†** |  |
| 627394 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Level 3 Financing, Inc., Tranche B 2027 Term Loan, 6.134% (LIBOR + 175 bps), 3/1/27 | $602887 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Telephone-Integrated** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **602887** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Senior Secured Floating Rate Loan Interests<br> (Cost $18,815,537)** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **17826503** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Asset Backed Securities — 8.3% of Net<br> Assets** |  |
| 500000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;321 Henderson Receivables III LLC, Series 2008-1A, Class B, 8.37%, 1/15/46 (144A) | $515962 |
| 301,074(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;321 Henderson Receivables LLC, Series 2005-1A, Class A1, 4.548% (1 Month USD LIBOR + 23 bps), 11/15/40 (144A) | &nbsp;&nbsp; 294374 |
| 1,750,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ABPCI Direct Lending Fund CLO X LP, Series 2020-10A, Class A1A, 6.193% (3 Month USD LIBOR + 195 bps), 1/20/32 (144A) | &nbsp;&nbsp; 1723295 |
| 2257056 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Accelerated LLC, Series 2021-1H, Class C, 2.35%, 10/20/40 (144A) | &nbsp;&nbsp; 1974271 |
| 2676000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Amur Equipment Finance Receivables VII LLC, Series 2019-1A, Class E, 4.47%, 3/20/25 (144A) | &nbsp;&nbsp; 2640071 |
| 5415000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Aqua Finance Trust, Series 2019-A, Class C, 4.01%, 7/16/40 (144A) | &nbsp;&nbsp; 4978051 |
| 2110000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Aqua Finance Trust, Series 2020-AA, Class C, 3.97%, 7/17/46 (144A) | &nbsp;&nbsp; 1827225 |

---

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

22Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Asset Backed Securities — (continued)** |  |
| 3,175,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Arbor Realty Collateralized Loan Obligation, Ltd., Series 2020-FL1, Class C, 6.50% (1 Month Term SOFR + 216 bps), 2/15/35 (144A) | $3046803 |
| 6,975,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Arbor Realty Commercial Real Estate Notes, Ltd., Series 2021-FL3, Class C, 6.168% (1 Month USD LIBOR + 185 bps), 8/15/34 (144A) | &nbsp;&nbsp; 6295175 |
| 9,175,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Arbor Realty Commercial Real Estate Notes, Ltd., Series 2021-FL4, Class D, 7.218% (1 Month USD LIBOR + 290 bps), 11/15/36 (144A) | &nbsp;&nbsp; 8301806 |
| 11,740,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Arbor Realty Commercial Real Estate Notes, Ltd., Series 2022-FL1, Class C, 6.107% (SOFR30A + 230 bps), 1/15/37 (144A) | &nbsp;&nbsp; 10940373 |
| 10,600,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Arbor Realty Commercial Real Estate Notes, Ltd., Series 2022-FL2, Class C, 7.786% (1 Month Term SOFR + 345 bps), 5/15/37 (144A) | &nbsp;&nbsp; 10094098 |
| 8206688 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Blackbird Capital Aircraft, Series 2021-1A, Class A, 2.443%, 7/15/46 (144A) | &nbsp;&nbsp; 6732359 |
| 4,980,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BSPRT Issuer, Ltd., Series 2022-FL8, Class C, 6.107% (SOFR30A + 230 bps), 2/15/37 (144A) | &nbsp;&nbsp; 4678191 |
| 201800 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BXG Receivables Note Trust, Series 2015-A, Class A, 2.88%, 5/2/30 (144A) | &nbsp;&nbsp; 193695 |
| 2,750,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Carlyle US CLO, Ltd., Series 2019-4A, Class CR, 7.064% (3 Month Term SOFR + 320 bps), 4/15/35 (144A) | &nbsp;&nbsp; 2513453 |
| 5,693,063(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Cascade MH Asset Trust, Series 2019-MH1, Class A, 4.00%, 11/25/44 (144A) | &nbsp;&nbsp; 5324312 |
| 4405000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Commercial Equipment Finance LLC, Series 2021-A, Class C, 3.55%, 12/15/28 (144A) | &nbsp;&nbsp; 4099774 |
| 315,872(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Commonbond Student Loan Trust, Series 2017-BGS, Class A2, 5.039% (1 Month USD LIBOR + 65 bps), 9/25/42 (144A) | &nbsp;&nbsp; 308766 |
| 2338854 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Continental Credit Card ABS LLC, Series 2019-1A, Class A, 3.83%, 8/15/26 (144A) | &nbsp;&nbsp; 2318478 |
| 12425000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Continental Finance Credit Card ABS Master Trust, Series 2022-A, Class A, 6.19%, 10/15/30 (144A) | &nbsp;&nbsp; 11891930 |
| 2400000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;DataBank Issuer, Series 2021-1A, Class B, 2.65%, 2/27/51 (144A) | &nbsp;&nbsp; 2053779 |
| 396467 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Diamond Resorts Owner Trust, Series 2019-1A, Class B, 3.53%, 2/20/32 (144A) | &nbsp;&nbsp; 386729 |
| 8300287 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Domino's Pizza Master Issuer LLC, Series 2019-1A, Class A2, 3.668%, 10/25/49 (144A) | &nbsp;&nbsp; 7170120 |
| 1515000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Drive Auto Receivables Trust, Series 2020-2, Class D, 3.05%, 5/15/28 | &nbsp;&nbsp; 1482661 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2223

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Asset Backed Securities — (continued)** |  |
| 4000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ExteNet LLC, Series 2019-1A, Class C, 5.219%, 7/26/49 (144A) | $3733079 |
| 68558 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FCI Funding LLC, Series 2019-1A, Class A, 3.63%, 2/18/31 (144A) | &nbsp;&nbsp; 68493 |
| 84291 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FCI Funding LLC, Series 2019-1A, Class B, 3.66%, 2/18/31 (144A) | &nbsp;&nbsp; 84181 |
| 12,575,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Finance of America HECM Buyout, Series 2022-HB1, Class M3, 5.084%, 2/25/32 (144A) | &nbsp;&nbsp; 11694034 |
| 5343944 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Finance of America Structured Securities Trust, Series 2021-S2, Class A2, 1.75%, 9/25/51 | &nbsp;&nbsp; 4933418 |
| 8,000,497(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Finance of America Structured Securities Trust, Series 2022-S1, Class A1, 2.00%, 2/25/52 | &nbsp;&nbsp; 7282902 |
| 8,387,848(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Finance of America Structured Securities Trust, Series 2022-S1, Class A2, 3.00%, 2/25/52 | &nbsp;&nbsp; 7407518 |
| 1,575,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;First Eagle BSL CLO, Ltd., Series 2019-1A, Class C, 8.593% (3 Month USD LIBOR + 435 bps), 1/20/33 (144A) | &nbsp;&nbsp; 1402289 |
| 1,000,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;First Eagle BSL CLO, Ltd., Series 2019-1A, Class D, 11.943% (3 Month USD LIBOR + 770 bps), 1/20/33 (144A) | &nbsp;&nbsp; 861142 |
| 1,000,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Fort Washington CLO, Series 2019-1A, Class ER, 10.993% (3 Month USD LIBOR + 675 bps), 10/20/32 (144A) | &nbsp;&nbsp; 817747 |
| 3440000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Foundation Finance Trust, Series 2019-1A, Class B, 4.22%, 11/15/34 (144A) | &nbsp;&nbsp; 3281121 |
| 2947658 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Foundation Finance Trust, Series 2021-1A, Class A, 1.27%, 5/15/41 (144A) | &nbsp;&nbsp; 2636278 |
| 4200000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Four Seas LP, Series 2017-1A, Class A2, 5.927%, 8/28/27 (144A) | &nbsp;&nbsp; 3614343 |
| 3,000,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Goldentree Loan Management US CLO 6, Ltd., Series 2019-6A, Class DR, 7.063% (3 Month Term SOFR + 310 bps), 4/20/35 (144A) | &nbsp;&nbsp; 2625273 |
| 3978413 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Hardee's Funding LLC, Series 2018-1A, Class A2II, 4.959%, 6/20/48 (144A) | &nbsp;&nbsp; 3736298 |
| 3,440,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;HGI CRE CLO, Ltd., Series 2021-FL2, Class C, 6.126% (1 Month USD LIBOR + 180 bps), 9/17/36 (144A) | &nbsp;&nbsp; 3228949 |
| 477618 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;HIN Timeshare Trust, Series 2020-A, Class D, 5.50%, 10/9/39 (144A) | &nbsp;&nbsp; 439741 |
| 5890438 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;HOA Funding LLC - HOA, Series 2021-1A, Class A2, 4.723%, 8/20/51 (144A) | &nbsp;&nbsp; 4401612 |
| 3035501 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Home Partners of America Trust, Series 2019-1, Class D, 3.406%, 9/17/39 (144A) | &nbsp;&nbsp; 2610325 |
| 4255096 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Home Partners of America Trust, Series 2019-2, Class E, 3.32%, 10/19/39 (144A) | &nbsp;&nbsp; 3502886 |

---

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

24Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Asset Backed Securities — (continued)** |  |
| 2052000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Horizon Funding LLC, Series 2019-1A, Class A1, 4.21%, 9/15/27 (144A) | $2021446 |
| 666243 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Icon Brand Holdings LLC, Series 2012-1A, Class A, 4.229%, 1/25/43 (144A) | &nbsp;&nbsp; 199896 |
| 183300 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Icon Brand Holdings LLC, Series 2013-1A, Class A2, 4.352%, 1/25/43 (144A) | &nbsp;&nbsp; 54996 |
| 3219058 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;J.G. Wentworth XLI LLC, Series 2018-1A, Class A, 3.74%, 10/17/72 (144A) | &nbsp;&nbsp; 2662214 |
| 5085526 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JG Wentworth XLIII LLC, Series 2019-1A, Class A, 3.82%, 8/17/71 (144A) | &nbsp;&nbsp; 4291052 |
| 152771 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JG Wentworth XXII LLC, Series 2010-3A, Class A, 3.82%, 12/15/48 (144A) | &nbsp;&nbsp; 148645 |
| 1950000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JPMorgan Chase Bank NA - CACLN, Series 2021-3, Class F, 3.694%, 2/26/29 (144A) | &nbsp;&nbsp; 1691000 |
| 4332851 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Libra Solutions LLC, Series 2022-2A, Class B, 8.85%, 10/15/34 (144A) | &nbsp;&nbsp; 4277041 |
| 1751783 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Marlette Funding Trust, Series 2019-2A, Class C, 4.11%, 7/16/29 (144A) | &nbsp;&nbsp; 1738558 |
| 6930000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Mercury Financial Credit Card Master Trust, Series 2021-1A, Class A, 1.54%, 3/20/26 (144A) | &nbsp;&nbsp; 6611602 |
| 9,635,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MF1, Ltd., Series 2021-FL7, Class D, 6.889% (1 Month USD LIBOR + 255 bps), 10/16/36 (144A) | &nbsp;&nbsp; 8949826 |
| 1787796 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Mosaic Solar Loan Trust, Series 2019-2A, Class A, 2.88%, 9/20/40 (144A) | &nbsp;&nbsp; 1535676 |
| 29010 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Mosaic Solar Loan Trust, Series 2019-2A, Class C, 4.35%, 9/20/40 (144A) | &nbsp;&nbsp; 28912 |
| 819733 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Mosaic Solar Loan Trust, Series 2020-1A, Class A, 2.10%, 4/20/46 (144A) | &nbsp;&nbsp; 711579 |
| 425051 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MVW LLC, Series 2020-1A, Class C, 4.21%, 10/20/37 (144A) | &nbsp;&nbsp; 397459 |
| 5095000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Nelnet Student Loan Trust, Series 2021-A, Class B1, 2.85%, 4/20/62 (144A) | &nbsp;&nbsp; 4049072 |
| 2,850,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Newark BSL CLO 1, Ltd., Series 2016-1A, Class CR, 7.358% (3 Month USD LIBOR + 300 bps), 12/21/29 (144A) | &nbsp;&nbsp; 2709407 |
| 697,898(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Newtek Small Business Loan Trust, Series 2017-1, Class A, 6.389% (1 Month USD LIBOR + 200 bps), 2/25/43 (144A) | &nbsp;&nbsp; 695405 |
| 2491974 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;NMEF Funding LLC, Series 2019-A, Class C, 3.30%, 8/17/26 (144A) | &nbsp;&nbsp; 2475147 |
| 2300000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;NMEF Funding LLC, Series 2021-A, Class C, 2.58%, 12/15/27 (144A) | &nbsp;&nbsp; 2172887 |
| 2690000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;NMEF Funding LLC, Series 2022-B, Class C, 8.54%, 6/15/29 (144A) | &nbsp;&nbsp; 2703969 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2225

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Asset Backed Securities — (continued)** |  |
| 4315000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Oportun Funding XIV LLC, Series 2021-A, Class C, 3.44%, 3/8/28 (144A) | $3974694 |
| 2038864 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Orange Lake Timeshare Trust, Series 2019-A, Class D, 4.93%, 4/9/38 (144A) | &nbsp;&nbsp; 1878357 |
| 1081106 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Oxford Finance Funding LLC, Series 2019-1A, Class B, 5.438%, 2/15/27 (144A) | &nbsp;&nbsp; 1052255 |
| 4,000,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Palmer Square Loan Funding, Ltd., Series 2020-1A, Class B, 6.575% (3 Month USD LIBOR + 190 bps), 2/20/28 (144A) | &nbsp;&nbsp; 3931980 |
| 4,000,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Palmer Square Loan Funding, Ltd., Series 2020-1A, Class D, 9.525% (3 Month USD LIBOR + 485 bps), 2/20/28 (144A) | &nbsp;&nbsp; 3701120 |
| 3,000,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Palmer Square Loan Funding, Ltd., Series 2022-1A, Class C, 6.464% (3 Month Term SOFR + 260 bps), 4/15/30 (144A) | &nbsp;&nbsp; 2857035 |
| 5500000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Perimeter Master Note Business Trust, Series 2019-2A, Class B, 5.21%, 5/15/24 (144A) | &nbsp;&nbsp; 5348880 |
| 5000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;PG Receivables Finance, Series 2020-1, Class A1, 3.968%, 7/20/25 (144A) | &nbsp;&nbsp; 4800000 |
| 2350000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;PG Receivables Finance, Series 2020-1, Class B, 4.705%, 7/20/25 (144A) | &nbsp;&nbsp; 2256000 |
| 8,500,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Race Point VIII CLO, Ltd., Series 2013-8A, Class CR2, 6.725% (3 Month USD LIBOR + 205 bps), 2/20/30 (144A) | &nbsp;&nbsp; 8037337 |
| 4,000,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Race Point VIII CLO, Ltd., Series 2013-8A, Class DR2, 8.175% (3 Month USD LIBOR + 350 bps), 2/20/30 (144A) | &nbsp;&nbsp; 3766024 |
| 9010000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Republic Finance Issuance Trust, Series 2021-A, Class A, 2.30%, 12/22/31 (144A) | &nbsp;&nbsp; 8072001 |
| 2300000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Republic Finance Issuance Trust, Series 2021-A, Class C, 3.53%, 12/22/31 (144A) | &nbsp;&nbsp; 1998028 |
| 657245 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Santander Bank N.A. - SBCLN, Series 2021-1A, Class C, 3.268%, 12/15/31 (144A) | &nbsp;&nbsp; 634539 |
| 1925000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Santander Bank N.A. - SBCLN, Series 2021-1A, Class D, 5.004%, 12/15/31 (144A) | &nbsp;&nbsp; 1770418 |
| 2760429 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Santander Bank NA - SBCLN, Series 2021-1A, Class B, 1.833%, 12/15/31 (144A) | &nbsp;&nbsp; 2655071 |
| 6975000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SBA Tower Trust, 3.869%, 10/15/49 (144A) | &nbsp;&nbsp; 6664543 |
| 4600000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SCF Equipment Leasing LLC, Series 2019-2A, Class C, 3.11%, 6/21/27 (144A) | &nbsp;&nbsp; 4344006 |
| 5,000,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Signal Peak CLO 2 LLC, Series 2015-1A, Class DR2, 7.093% (3 Month USD LIBOR + 285 bps), 4/20/29 (144A) | &nbsp;&nbsp; 4691695 |

---

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

26Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Asset Backed Securities — (continued)** |  |
| 2,750,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sound Point CLO XXVIII, Ltd., Series 2020-3A, Class D, 8.008% (3 Month USD LIBOR + 365 bps), 1/25/32 (144A) | $2503751 |
| 5325684 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SpringCastle America Funding LLC, Series 2020-AA, Class A, 1.97%, 9/25/37 (144A) | &nbsp;&nbsp; 4802587 |
| 10,345,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;STWD, Ltd., Series 2022-FL3, Class B, 5.757% (SOFR30A + 195 bps), 11/15/38 (144A) | &nbsp;&nbsp; 9764618 |
| 38515 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Tidewater Auto Receivables Trust, Series 2018-AA, Class D, 4.30%, 11/15/24 (144A) | &nbsp;&nbsp; 38452 |
| 3700000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Tricolor Auto Securitization Trust, Series 2021-1A, Class D, 1.92%, 5/15/26 (144A) | &nbsp;&nbsp; 3602589 |
| 8580476 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Tricon American Homes Trust, Series 2019-SFR1, Class A, 2.75%, 3/17/38 (144A) | &nbsp;&nbsp; 7861045 |
| 5650000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Tricon American Homes Trust, Series 2020-SFR2, Class E1, 2.73%, 11/17/39 (144A) | &nbsp;&nbsp; 4620817 |
| 44380 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;United States Small Business Administration, Series 2005-20B, Class 1, 4.625%, 2/1/25 | &nbsp;&nbsp; 43419 |
| 37076 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;United States Small Business Administration, Series 2005-20E, Class 1, 4.84%, 5/1/25 | &nbsp;&nbsp; 36867 |
| 72736 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;United States Small Business Administration, Series 2008-20D, Class 1, 5.37%, 4/1/28 | &nbsp;&nbsp; 72036 |
| 69689 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;United States Small Business Administration, Series 2008-20H, Class 1, 6.02%, 8/1/28 | &nbsp;&nbsp; 69242 |
| 52122 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;United States Small Business Administration, Series 2008-20J, Class 1, 5.63%, 10/1/28 | &nbsp;&nbsp; 51357 |
| 43382 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;United States Small Business Administration, Series 2008-20L, Class 1, 6.22%, 12/1/28 | &nbsp;&nbsp; 44331 |
| 21073 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;United States Small Business Administration, Series 2009-20A, Class 1, 5.72%, 1/1/29 | &nbsp;&nbsp; 20761 |
| 47582 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;United States Small Business Administration, Series 2009-20I, Class 1, 4.20%, 9/1/29 | &nbsp;&nbsp; 46432 |
| 3876002 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Upstart Securitization Trust, Series 2020-1, Class C, 4.899%, 4/22/30 (144A) | &nbsp;&nbsp; 3798891 |
| 479733 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Welk Resorts LLC, Series 2017-AA, Class B, 3.41%, 6/15/33 (144A) | &nbsp;&nbsp; 476294 |
| 822149 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Welk Resorts LLC, Series 2019-AA, Class C, 3.34%, 6/15/38 (144A) | &nbsp;&nbsp; 788249 |
| 394540 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Welk Resorts LLC, Series 2019-AA, Class D, 4.03%, 6/15/38 (144A) | &nbsp;&nbsp; 379541 |
| 2021751 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Westgate Resorts LLC, Series 2020-1A, Class C, 6.213%, 3/20/34 (144A) | &nbsp;&nbsp; 1990936 |
| 9984822 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Westgate Resorts LLC, Series 2022-1A, Class C, 2.488%, 8/20/36 (144A) | &nbsp;&nbsp; 9372461 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2227

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Asset Backed Securities — (continued)** |  |
| 1,800,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Whitebox CLO II, Ltd., Series 2020-2A, Class ER, 11.425% (3 Month USD LIBOR + 710 bps), 10/24/34 (144A) | $1591153 |
| 1,500,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Woodmont Trust, Series 2020-7A, Class A1A, 5.979% (3 Month USD LIBOR + 190 bps), 1/15/32 (144A) | &nbsp;&nbsp; 1462359 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Asset Backed Securities<br> (Cost $376,175,908)** | &nbsp;&nbsp; **$** **346145340** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Collateralized Mortgage <br> Obligations—12.6% of Net Assets** |  |
| 4,671,243(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Bayview MSR Opportunity Master Fund Trust, Series 2022-5, Class B2, 3.47%, 2/25/52 (144A) | $3321270 |
| 514,465(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Bellemeade Re, Ltd., Series 2018-3A, Class M1B, 6.239% (1 Month USD LIBOR + 185 bps), 10/25/28 (144A) | &nbsp;&nbsp; 514053 |
| 7,010,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Bellemeade Re, Ltd., Series 2018-3A, Class M2, 7.139% (1 Month USD LIBOR + 275 bps), 10/25/28 (144A) | &nbsp;&nbsp; 6947096 |
| 173,666(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Bellemeade Re, Ltd., Series 2019-1A, Class M1B, 6.139% (1 Month USD LIBOR + 175 bps), 3/25/29 (144A) | &nbsp;&nbsp; 173594 |
| 3,725,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Bellemeade Re, Ltd., Series 2019-1A, Class M2, 7.089% (1 Month USD LIBOR + 270 bps), 3/25/29 (144A) | &nbsp;&nbsp; 3696735 |
| 5,418,419(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Bellemeade Re, Ltd., Series 2020-3A, Class M1C, 8.089% (1 Month USD LIBOR + 370 bps), 10/25/30 (144A) | &nbsp;&nbsp; 5450948 |
| 4,910,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Bellemeade Re, Ltd., Series 2020-3A, Class M2, 9.239% (1 Month USD LIBOR + 485 bps), 10/25/30 (144A) | &nbsp;&nbsp; 4812692 |
| 3,000,654(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Bellemeade Re, Ltd., Series 2020-4A, Class M2B, 7.989% (1 Month USD LIBOR + 360 bps), 6/25/30 (144A) | &nbsp;&nbsp; 2997705 |
| 4,880,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Bellemeade Re, Ltd., Series 2021-3A, Class M2, 7.078% (SOFR30A + 315 bps), 9/25/31 (144A) | &nbsp;&nbsp; 4181616 |
| 12,559,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BINOM Securitization Trust, Series 2022-RPL1, Class M2, 3.00%, 2/25/61 (144A) | &nbsp;&nbsp; 8460532 |
| 3,386,730(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Brean Asset Backed Securities Trust, Series 2021-RM1, Class A, 1.40%, 10/25/63 (144A) | &nbsp;&nbsp; 2881839 |
| 2,985,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Bunker Hill Loan Depositary Trust, Series 2020-1, Class A3, 3.253%, 2/25/55 (144A) | &nbsp;&nbsp; 2679423 |
| 1,532,270(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Cascade Funding Mortgage Trust, Series 2018-RM2, Class A, 4.00%, 10/25/68 (144A) | &nbsp;&nbsp; 1474731 |

---

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

28Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Collateralized Mortgage<br> Obligations—(continued)** |  |
| 3,234,695(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Cascade Funding Mortgage Trust, Series 2018-RM2, Class C, 4.00%, 10/25/68 (144A) | $3044704 |
| 3,580,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Cascade Funding Mortgage Trust, Series 2021-HB6, Class M3, 3.735%, 6/25/36 (144A) | &nbsp;&nbsp; 3228138 |
| 3773000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Cascade MH Asset Trust, Series 2021-MH1, Class M1, 2.992%, 2/25/46 (144A) | &nbsp;&nbsp; 2713780 |
| 1906000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Cascade MH Asset Trust, Series 2021-MH1, Class M2, 3.693%, 2/25/46 (144A) | &nbsp;&nbsp; 1403673 |
| 3,485,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CFMT LLC, Series 2021-HB5, Class M3, 2.91%, 2/25/31 (144A) | &nbsp;&nbsp; 3213418 |
| 7,600,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CFMT LLC, Series 2021-HB7, Class M3, 3.849%, 10/27/31 (144A) | &nbsp;&nbsp; 6905854 |
| 3,745,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CFMT LLC, Series 2022-HB9, Class M3, 3.25%, 9/25/37 (144A) | &nbsp;&nbsp; 2903433 |
| 5,170,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CIM Trust, Series 2020-R2, Class M3, 3.00%, 10/25/59 (144A) | &nbsp;&nbsp; 3742316 |
| 5,713,342(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CIM Trust, Series 2021-J1, Class B1, 2.658%, 3/25/51 (144A) | &nbsp;&nbsp; 4240760 |
| 3,332,101(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CIM Trust, Series 2021-J2, Class B2, 2.673%, 4/25/51 (144A) | &nbsp;&nbsp; 2354589 |
| 3,184,747(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Citigroup Mortgage Loan Trust, Series 2021-INV1, Class B1W, 2.707%, 5/25/51 (144A) | &nbsp;&nbsp; 2365527 |
| 168,484(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Connecticut Avenue Securities Trust, Series 2019-R03, Class 1M2, 6.539% (1 Month USD LIBOR + 215 bps), 9/25/31 (144A) | &nbsp;&nbsp; 168073 |
| 9,260,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Connecticut Avenue Securities Trust, Series 2022-R02, Class 2M2, 6.928% (SOFR30A + 300 bps), 1/25/42 (144A) | &nbsp;&nbsp; 8725068 |
| 2,490,163(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CSMC Trust, Series 2021-RPL2, Class M1, 2.75%, 1/25/60 (144A) | &nbsp;&nbsp; 1766416 |
| 2,350,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CSMC Trust, Series 2021-RPL2, Class M2, 3.25%, 1/25/60 (144A) | &nbsp;&nbsp; 1633340 |
| 1,450,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Deephaven Residential Mortgage Trust, Series 2020-2, Class M1, 4.112%, 5/25/65 (144A) | &nbsp;&nbsp; 1324772 |
| 1,727,526(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Eagle Re, Ltd., Series 2018-1, Class M1, 6.089% (1 Month USD LIBOR + 170 bps), 11/25/28 (144A) | &nbsp;&nbsp; 1721863 |
| 6,126,937(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Eagle Re, Ltd., Series 2019-1, Class M1B, 6.189% (1 Month USD LIBOR + 180 bps), 4/25/29 (144A) | &nbsp;&nbsp; 5997659 |
| 194,324(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Fannie Mae Grantor Trust, Series 2004-T2, Class 2A, 3.738%, 7/25/43 | &nbsp;&nbsp; 191285 |
| 5,140,570(a)(c) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp. REMICs, Series 4091, Class SH, 2.232% (1 Month USD LIBOR + 655 bps), 8/15/42 | &nbsp;&nbsp; 592365 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2229

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Collateralized Mortgage<br> Obligations—(continued)** |  |
| 2,979,069(c) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp. REMICs, Series 4999, Class QI, 4.00%, 5/25/50 | $570486 |
| 5,762,326(c) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp. REMICs, Series 5018, Class EI, 4.00%, 10/25/50 | &nbsp;&nbsp; 1163362 |
| 3,117,618(c) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp. REMICs, Series 5067, Class GI, 4.00%, 12/25/50 | &nbsp;&nbsp; 606461 |
| 48883 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association REMICs, Series 2009-36, Class HX, 4.50%, 6/25/29 | &nbsp;&nbsp; 48089 |
| 2,494,708(c) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association REMICs, Series 2020-83, Class EI, 4.00%, 11/25/50 | &nbsp;&nbsp; 511037 |
| 173,297,900(b)(c) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Flagstar Mortgage Trust, Series 2021-4, Class AX1, 0.207%, 6/1/51 (144A) | &nbsp;&nbsp; 1653019 |
| 6,940,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Freddie Mac STACR REMIC Trust, Series 2019-HRP1, Class M3, 6.639% (1 Month USD LIBOR + 225 bps), 2/25/49 (144A) | &nbsp;&nbsp; 6463561 |
| 6,951,944(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Freddie Mac STACR REMIC Trust, Series 2020-DNA3, Class B1, 9.489% (1 Month USD LIBOR + 510 bps), 6/25/50 (144A) | &nbsp;&nbsp; 7242705 |
| 8,723,692(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Freddie Mac STACR REMIC Trust, Series 2020-DNA4, Class B1, 10.389% (1 Month USD LIBOR + 600 bps), 8/25/50 (144A) | &nbsp;&nbsp; 9275113 |
| 2,766,175(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Freddie Mac STACR REMIC Trust, Series 2020-DNA5, Class M2, 6.728% (SOFR30A + 280 bps), 10/25/50 (144A) | &nbsp;&nbsp; 2787926 |
| 9,475,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Freddie Mac STACR REMIC Trust, Series 2022-DNA2, Class M2, 7.678% (SOFR30A + 375 bps), 2/25/42 (144A) | &nbsp;&nbsp; 8910710 |
| 5,590,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Freddie Mac STACR REMIC Trust, Series 2022-DNA3, Class M1B, 6.828% (SOFR30A + 290 bps), 4/25/42 (144A) | &nbsp;&nbsp; 5523663 |
| 1,560,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Freddie Mac STACR REMIC Trust, Series 2022-HQA1, Class M1B, 7.428% (SOFR30A + 350 bps), 3/25/42 (144A) | &nbsp;&nbsp; 1546825 |
| 1,548,238(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FWD Securitization Trust, Series 2019-INV1, Class A1, 2.81%, 6/25/49 (144A) | &nbsp;&nbsp; 1422241 |
| 45008 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association, Series 2005-61, Class UZ, 5.25%, 8/16/35 | &nbsp;&nbsp; 44921 |
| 31555 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association, Series 2012-130, Class PA, 3.00%, 4/20/41 | &nbsp;&nbsp; 31264 |
| 338996 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association, Series 2013-169, Class TE, 3.25%, 4/16/27 | &nbsp;&nbsp; 326990 |
| 14,690,740(c) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association, Series 2019-159, Class CI, 3.50%, 12/20/49 | &nbsp;&nbsp; 2570497 |

---

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

30Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Collateralized Mortgage<br> Obligations—(continued)** |  |
| 12,700,528(a)(c) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association, Series 2020-9, Class SA, 3.35% (1 Month USD LIBOR + 335 bps), 1/20/50 | $233829 |
| 2,982,057(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;GS Mortgage-Backed Securities Corp. Trust, Series 2021-PJ1, Class B3, 2.754%, 6/25/51 (144A) | &nbsp;&nbsp; 1909699 |
| 6,071,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;GS Mortgage-Backed Securities Corp. Trust, Series 2021-RPL1, Class B1, 2.75%, 12/25/60 (144A) | &nbsp;&nbsp; 4326255 |
| 4,820,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;GS Mortgage-Backed Securities Corp. Trust, Series 2022-PJ4, Class A33, 3.00%, 9/25/52 (144A) | &nbsp;&nbsp; 3395353 |
| 159,182(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;GS Mortgage-Backed Securities Trust, Series 2020-NQM1, Class A3, 2.352%, 9/27/60 (144A) | &nbsp;&nbsp; 140090 |
| 2,102,692(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;GS Mortgage-Backed Securities Trust, Series 2021-GR3, Class B2, 3.39%, 4/25/52 (144A) | &nbsp;&nbsp; 1505754 |
| 2,981,149(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;GS Mortgage-Backed Securities Trust, Series 2021-PJ9, Class B3, 2.936%, 2/26/52 (144A) | &nbsp;&nbsp; 1913757 |
| 1,782,124(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Home Re, Ltd., Series 2019-1, Class M1, 6.039% (1 Month USD LIBOR + 165 bps), 5/25/29 (144A) | &nbsp;&nbsp; 1754848 |
| 1,731,970(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Home Re, Ltd., Series 2020-1, Class M1C, 8.539% (1 Month USD LIBOR + 415 bps), 10/25/30 (144A) | &nbsp;&nbsp; 1732544 |
| 4,580,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Home Re, Ltd., Series 2020-1, Class M2, 9.639% (1 Month USD LIBOR + 525 bps), 10/25/30 (144A) | &nbsp;&nbsp; 4619157 |
| 2,780,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Home Re, Ltd., Series 2021-1, Class M2, 7.239% (1 Month USD LIBOR + 285 bps), 7/25/33 (144A) | &nbsp;&nbsp; 2592123 |
| 3,990,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Homeward Opportunities Fund I Trust, Series 2020-2, Class A3, 3.196%, 5/25/65 (144A) | &nbsp;&nbsp; 3553857 |
| 2,185,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Homeward Opportunities Fund I Trust, Series 2020-2, Class M1, 3.897%, 5/25/65 (144A) | &nbsp;&nbsp; 1870230 |
| 60,760,030(b)(c) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Hundred Acre Wood Trust, Series 2021-INV1, Class AX1, 0.227%, 7/25/51 (144A) | &nbsp;&nbsp; 619187 |
| 4,627,389(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Hundred Acre Wood Trust, Series 2021-INV1, Class B1, 3.227%, 7/25/51 (144A) | &nbsp;&nbsp; 3405644 |
| 12,320,616(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Hundred Acre Wood Trust, Series 2021-INV3, Class A3, 2.50%, 10/25/51 (144A) | &nbsp;&nbsp; 9889697 |
| 1,800,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Imperial Fund Mortgage Trust, Series 2021-NQM2, Class B1, 3.295%, 9/25/56 (144A) | &nbsp;&nbsp; 959047 |
| 2,065,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Imperial Fund Mortgage Trust, Series 2021-NQM2, Class M1, 2.489%, 9/25/56 (144A) | &nbsp;&nbsp; 1114744 |
| 13711157 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;IMS Ecuadorian Mortgage Trust, Series 2021-1, Class GA, 3.40%, 8/18/43 (144A) | &nbsp;&nbsp; 12682821 |
| 114,948,330(b)(c) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JP Morgan Mortgage Trust, Series 2021-10, Class AX1, 0.123%, 12/25/51 (144A) | &nbsp;&nbsp; 621572 |
| 5,779,768(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JP Morgan Mortgage Trust, Series 2021-10, Class B1, 2.811%, 12/25/51 (144A) | &nbsp;&nbsp; 4247356 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2231

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Collateralized Mortgage<br> Obligations—(continued)** |  |
| 4,154,678(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JP Morgan Mortgage Trust, Series 2021-12, Class B1, 3.167%, 2/25/52 (144A) | $3173517 |
| 3,965,454(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JP Morgan Mortgage Trust, Series 2021-13, Class B1, 3.143%, 4/25/52 (144A) | &nbsp;&nbsp; 3055744 |
| 4,951,535(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JP Morgan Mortgage Trust, Series 2021-7, Class B2, 2.799%, 11/25/51 (144A) | &nbsp;&nbsp; 3253407 |
| 99,471,981(b)(c) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JP Morgan Mortgage Trust, Series 2021-8, Class AX1, 0.124%, 12/25/51 (144A) | &nbsp;&nbsp; 578300 |
| 9,088,294(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JP Morgan Mortgage Trust, Series 2021-8, Class B2, 2.849%, 12/25/51 (144A) | &nbsp;&nbsp; 5984590 |
| 2,698,416(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JP Morgan Mortgage Trust, Series 2021-INV1, Class B1, 2.986%, 10/25/51 (144A) | &nbsp;&nbsp; 2003944 |
| 3,333,564(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JP Morgan Mortgage Trust, Series 2021-INV1, Class B2, 2.986%, 10/25/51 (144A) | &nbsp;&nbsp; 2341194 |
| 4,643,067(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JP Morgan Mortgage Trust, Series 2021-INV4, Class B2, 3.225%, 1/25/52 (144A) | &nbsp;&nbsp; 3285007 |
| 4,921,438(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JP Morgan Mortgage Trust, Series 2021-INV4, Class B3, 3.225%, 1/25/52 (144A) | &nbsp;&nbsp; 3323674 |
| 7,106,976(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JP Morgan Mortgage Trust, Series 2022-3, Class B2, 3.116%, 8/25/52 (144A) | &nbsp;&nbsp; 5073193 |
| 6,420,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JP Morgan Mortgage Trust, Series 2022-4, Class A5, 3.00%, 10/25/52 (144A) | &nbsp;&nbsp; 4517656 |
| 3,585,539(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JP Morgan Mortgage Trust, Series 2022-6, Class B2, 3.309%, 11/25/52 (144A) | &nbsp;&nbsp; 2502998 |
| 6,014,385(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JP Morgan Mortgage Trust, Series 2022-INV1, Class B2, 3.298%, 3/25/52 (144A) | &nbsp;&nbsp; 4309068 |
| 7,114,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JP Morgan Mortgage Trust, Series 2022-LTV1, Class M1, 3.525%, 7/25/52 (144A) | &nbsp;&nbsp; 4372986 |
| 1248064 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;La Hipotecaria El Salvadorian Mortgage Trust, Series 2016-1A, Class A, 3.358%, 1/15/46 (144A) | &nbsp;&nbsp; 1166940 |
| 422,721(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;La Hipotecaria Panamanian Mortgage Trust, Series 2010-1GA, Class A, 2.75% (Panamanian Mortgage Reference Rate - 300 bps), 9/8/39 (144A) | &nbsp;&nbsp; 401585 |
| 1,948,700(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;La Hipotecaria Panamanian Mortgage Trust, Series 2014-1A, Class A1, 3.508% (Panamanian Mortgage Reference Rate + -224 bps), 11/24/42 (144A) | &nbsp;&nbsp; 1851265 |
| 7774482 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;La Hipotecaria Panamanian Mortgage Trust, Series 2021-1, Class GA, 4.35%, 7/13/52 (144A) | &nbsp;&nbsp; 7210832 |
| 4,880,823(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;LSTAR Securities Investment, Ltd., Series 2019-3, Class A1, 7.869% (1 Month USD LIBOR + 350 bps), 4/1/24 (144A) | &nbsp;&nbsp; 4848167 |

---

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

32Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Collateralized Mortgage<br> Obligations—(continued)** |  |
| 10,525,637(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Mello Mortgage Capital Acceptance, Series 2021-INV2, Class A15, 2.50%, 8/25/51 (144A) | $8041008 |
| 4,041,009(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Mello Mortgage Capital Acceptance, Series 2021-MTG1, Class B2, 2.647%, 4/25/51 (144A) | &nbsp;&nbsp; 2647448 |
| 4,674,551(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Mello Mortgage Capital Acceptance, Series 2021-MTG2, Class B1, 2.669%, 6/25/51 (144A) | &nbsp;&nbsp; 3332064 |
| 4,841,497(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Mello Mortgage Capital Acceptance, Series 2022-INV1, Class B1, 3.324%, 3/25/52 (144A) | &nbsp;&nbsp; 3640791 |
| 7,115,554(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Mello Mortgage Capital Acceptance, Series 2022-INV2, Class B1, 3.533%, 4/25/52 (144A) | &nbsp;&nbsp; 5121276 |
| 151,967(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MFA Trust, Series 2020-NQM1, Class A3, 2.30%, 8/25/49 (144A) | &nbsp;&nbsp; 139758 |
| 3,186,217(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Mill City Mortgage Loan Trust, Series 2017-3, Class B2, 3.25%, 1/25/61 (144A) | &nbsp;&nbsp; 2399001 |
| 7,800,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Mill City Mortgage Loan Trust, Series 2019-GS1, Class M3, 3.25%, 7/25/59 (144A) | &nbsp;&nbsp; 5665682 |
| 8,785,831(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Morgan Stanley Residential Mortgage Loan Trust, Series 2021-1, Class B1, 2.95%, 3/25/51 (144A) | &nbsp;&nbsp; 6502714 |
| 10,950,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;New Residential Mortgage Loan Trust, Series 2019-RPL2, Class M2, 3.75%, 2/25/59 (144A) | &nbsp;&nbsp; 9150854 |
| 4175000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;NYMT Loan Trust, Series 2022-CP1, Class M1, 3.215%, 7/25/61 (144A) | &nbsp;&nbsp; 3441187 |
| 335,096(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Oaktown Re V, Ltd., Series 2020-2A, Class M1B, 7.989% (1 Month USD LIBOR + 360 bps), 10/25/30 (144A) | &nbsp;&nbsp; 335240 |
| 3,550,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Oaktown Re V, Ltd., Series 2020-2A, Class M2, 9.639% (1 Month USD LIBOR + 525 bps), 10/25/30 (144A) | &nbsp;&nbsp; 3535993 |
| 8,597,262(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Oceanview Mortgage Trust, Series 2021-1, Class B2, 3.243%, 6/25/51 (144A) | &nbsp;&nbsp; 6169713 |
| 2,834,805(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Oceanview Mortgage Trust, Series 2021-5, Class B2, 2.978%, 10/25/51 (144A) | &nbsp;&nbsp; 1949934 |
| 4,514,742(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Onslow Bay Mortgage Loan Trust, Series 2022-INV4, Class A2, 3.00%, 6/25/52 (144A) | &nbsp;&nbsp; 3762934 |
| 6,673,891(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;PRMI Securitization Trust, Series 2021-1, Class B1, 2.479%, 4/25/51 (144A) | &nbsp;&nbsp; 4686733 |
| 2,735,625(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;PRMI Securitization Trust, Series 2021-1, Class B2, 2.479%, 4/25/51 (144A) | &nbsp;&nbsp; 1772906 |
| 3,425,544(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Provident Funding Mortgage Trust, Series 2021-1, Class B1, 2.384%, 4/25/51 (144A) | &nbsp;&nbsp; 2506540 |
| 3,451,150(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Provident Funding Mortgage Trust, Series 2021-2, Class B1, 2.354%, 4/25/51 (144A) | &nbsp;&nbsp; 2236966 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2233

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Collateralized Mortgage<br> Obligations—(continued)** |  |
| 2,888,183(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Provident Funding Mortgage Trust, Series 2021-J1, Class B1, 2.638%, 10/25/51 (144A) | $2130986 |
| 2,976,814(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Provident Funding Mortgage Trust, Series 2021-J1, Class B2, 2.638%, 10/25/51 (144A) | &nbsp;&nbsp; 2041723 |
| 6,538,531(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Radnor Re, Ltd., Series 2019-1, Class M1B, 6.339% (1 Month USD LIBOR + 195 bps), 2/25/29 (144A) | &nbsp;&nbsp; 6463470 |
| 3,437,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Radnor Re, Ltd., Series 2019-1, Class M2, 7.589% (1 Month USD LIBOR + 320 bps), 2/25/29 (144A) | &nbsp;&nbsp; 3368574 |
| 11,015,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Radnor Re, Ltd., Series 2020-1, Class M1C, 6.139% (1 Month USD LIBOR + 175 bps), 1/25/30 (144A) | &nbsp;&nbsp; 10769934 |
| 2,740,821(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Rate Mortgage Trust, Series 2021-HB1, Class B1, 2.706%, 12/25/51 (144A) | &nbsp;&nbsp; 1975425 |
| 4,103,925(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Rate Mortgage Trust, Series 2021-HB1, Class B2, 2.706%, 12/25/51 (144A) | &nbsp;&nbsp; 2863898 |
| 4,041,877(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Rate Mortgage Trust, Series 2021-J3, Class B2, 2.714%, 10/25/51 (144A) | &nbsp;&nbsp; 2730529 |
| 4,030,599(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Rate Mortgage Trust, Series 2021-J4, Class B3, 2.632%, 11/25/51 (144A) | &nbsp;&nbsp; 2540273 |
| 5,152,354(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;RCKT Mortgage Trust, Series 2021-1, Class B2A, 2.719%, 3/25/51 (144A) | &nbsp;&nbsp; 3635571 |
| 5,402,730(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;RCKT Mortgage Trust, Series 2021-2, Class B1A, 2.564%, 6/25/51 (144A) | &nbsp;&nbsp; 3851080 |
| 3,846,011(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;RCKT Mortgage Trust, Series 2021-2, Class B2A, 2.564%, 6/25/51 (144A) | &nbsp;&nbsp; 2533751 |
| 3,479,274(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;RCKT Mortgage Trust, Series 2021-3, Class A25, 2.50%, 7/25/51 (144A) | &nbsp;&nbsp; 2657974 |
| 10,649,649(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;RCKT Mortgage Trust, Series 2021-4, Class B1A, 3.008%, 9/25/51 (144A) | &nbsp;&nbsp; 7920693 |
| 12,685,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;RCKT Mortgage Trust, Series 2022-3, Class A17, 3.00%, 5/25/52 (144A) | &nbsp;&nbsp; 8902821 |
| 5,560,926(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;RCKT Mortgage Trust, Series 2022-3, Class B1A, 3.19%, 5/25/52 (144A) | &nbsp;&nbsp; 4141584 |
| 3,000,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;RMF Buyout Issuance Trust, Series 2021-HB1, Class M3, 3.69%, 11/25/31 (144A) | &nbsp;&nbsp; 2202137 |
| 4,751,164(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;RMF Proprietary Issuance Trust, Series 2021-2, Class A, 2.125%, 9/25/61 (144A) | &nbsp;&nbsp; 3783822 |
| 15,913,144(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Saluda Grade Alternative Mortgage Trust, Series 2021-FIG2, Class A2, 3.50%, 10/25/51 (144A) | &nbsp;&nbsp; 14600310 |
| 4,125,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Saluda Grade Alternative Mortgage Trust, Series 2022-SEQ2, Class A3, 4.50%, 2/25/52 (144A) | &nbsp;&nbsp; 3847032 |
| 541,452(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sequoia Mortgage Trust, Series 2012-6, Class B3, 3.702%, 12/25/42 | &nbsp;&nbsp; 512930 |

---

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

34Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Collateralized Mortgage<br> Obligations—(continued)** |  |
| 77,805(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sequoia Mortgage Trust, Series 2018-CH3, Class A1, 4.50%, 8/25/48 (144A) | $75698 |
| 2,868,680(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sequoia Mortgage Trust, Series 2021-1, Class B2, 2.66%, 3/25/51 (144A) | &nbsp;&nbsp; 1916258 |
| 1,379,760(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sequoia Mortgage Trust, Series 2021-4, Class A1, 2.50%, 6/25/51 (144A) | &nbsp;&nbsp; 1109251 |
| 4,725,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sequoia Mortgage Trust, Series 2022-1, Class A7, 2.50%, 2/25/52 (144A) | &nbsp;&nbsp; 3137580 |
| 11,220,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;STACR Trust, Series 2018-HRP2, Class B1, 8.589% (1 Month USD LIBOR + 420 bps), 2/25/47 (144A) | &nbsp;&nbsp; 11195127 |
| 3,660,655(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;STACR Trust, Series 2018-HRP2, Class M3, 6.789% (1 Month USD LIBOR + 240 bps), 2/25/47 (144A) | &nbsp;&nbsp; 3559315 |
| 10,000,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Towd Point Mortgage Trust, Series 2019-3, Class M2D, 3.25%, 2/25/59 (144A) | &nbsp;&nbsp; 7277633 |
| 2,000,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Towd Point Mortgage Trust, Series 2019-HY2, Class B1, 6.639% (1 Month USD LIBOR + 225 bps), 5/25/58 (144A) | &nbsp;&nbsp; 1862201 |
| 11,996,051(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Towd Point Mortgage Trust, Series 2021-R1, Class A1, 2.918%, 11/30/60 (144A) | &nbsp;&nbsp; 9623532 |
| 1,889,357(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Triangle Re, Ltd., Series 2020-1, Class M2, 9.989% (1 Month USD LIBOR + 560 bps), 10/25/30 (144A) | &nbsp;&nbsp; 1893002 |
| 1,892,371(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Triangle Re, Ltd., Series 2021-1, Class M1C, 7.789% (1 Month USD LIBOR + 340 bps), 8/25/33 (144A) | &nbsp;&nbsp; 1892366 |
| 7,942,321(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;UWM Mortgage Trust, Series 2021-INV4, Class B2, 3.229%, 12/25/51 (144A) | &nbsp;&nbsp; 5700840 |
| 5,024,102(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;UWM Mortgage Trust, Series 2021-INV5, Class B1, 3.242%, 1/25/52 (144A) | &nbsp;&nbsp; 3828604 |
| 2,810,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Wells Fargo Mortgage Backed Securities Trust, Series 2022-2, Class A5, 3.00%, 12/25/51 (144A) | &nbsp;&nbsp; 1981043 |
| 11,105,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Wells Fargo Mortgage Backed Securities Trust, Series 2022-2, Class A6, 2.50%, 12/25/51 (144A) | &nbsp;&nbsp; 7423760 |
| 8,840,336(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Wells Fargo Mortgage Backed Securities Trust, Series 2022-INV1, Class B2, 3.442%, 3/25/52 (144A) | &nbsp;&nbsp; 6316183 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Collateralized Mortgage Obligations<br> (Cost $631,361,203)** | &nbsp;&nbsp; **$** **522175420** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Commercial Mortgage-Backed<br> Securities—6.9% of Net Assets** |  |
| 4,360,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;AREIT Trust, Series 2022-CRE6, Class D, 6.676% (SOFR30A + 285 bps), 1/16/37 (144A) | $3989519 |
| 7460000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BANK, Series 2017-BNK5, Class AS, 3.624%, 6/15/60 | &nbsp;&nbsp; 6730622 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2235

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Commercial Mortgage-Backed<br> Securities—(continued)** |  |
| 2,444,409(c)(d) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Bayview Commercial Asset Trust, Series 2007-2A, Class IO, 0.000%, 7/25/37 (144A) | &nbsp;&nbsp;$— |
| 6,200,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Beast Mortgage Trust, Series 2021-1818, Class A, 5.368% (1 Month USD LIBOR + 105 bps), 3/15/36 (144A) | &nbsp;&nbsp; 5833871 |
| 3855000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Benchmark Mortgage Trust, Series 2018-B5, Class A3, 3.944%, 7/15/51 | &nbsp;&nbsp; 3610666 |
| 7340000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Benchmark Mortgage Trust, Series 2018-B8, Class A4, 3.963%, 1/15/52 | &nbsp;&nbsp; 6951368 |
| 2,615,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Benchmark Mortgage Trust, Series 2020-IG3, Class B, 3.29%, 9/15/48 (144A) | &nbsp;&nbsp; 2014399 |
| 3,030,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Benchmark Mortgage Trust, Series 2022-B34, Class AM, 3.833%, 4/15/55 | &nbsp;&nbsp; 2592308 |
| 1,375,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BSREP Commercial Mortgage Trust, Series 2021-DC, Class B, 5.668% (1 Month USD LIBOR + 135 bps), 8/15/38 (144A) | &nbsp;&nbsp; 1261868 |
| 3,200,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BX Commercial Mortgage Trust, Series 2020-VIV3, Class B, 3.544%, 3/9/44 (144A) | &nbsp;&nbsp; 2575303 |
| 7,615,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BX Commercial Mortgage Trust, Series 2021-VIV5, Class A, 2.843%, 3/9/44 (144A) | &nbsp;&nbsp; 6076268 |
| 6,105,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BX Commercial Mortgage Trust, Series 2021-VOLT, Class F, 6.718% (1 Month USD LIBOR + 240 bps), 9/15/36 (144A) | &nbsp;&nbsp; 5616630 |
| 17400000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BX Trust, Series 2019-OC11, Class A, 3.202%, 12/9/41 (144A) | &nbsp;&nbsp; 14556403 |
| 23,280,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BX Trust, Series 2021-ARIA, Class D, 6.213% (1 Month USD LIBOR + 190 bps), 10/15/36 (144A) | &nbsp;&nbsp; 21528559 |
| 2,385,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CCUBS Commercial Mortgage Trust, Series 2017-C1, Class AS, 3.907%, 11/15/50 | &nbsp;&nbsp; 2128351 |
| 3,845,959(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CHC Commercial Mortgage Trust, Series 2019-CHC, Class D, 6.368% (1 Month USD LIBOR + 205 bps), 6/15/34 (144A) | &nbsp;&nbsp; 3533794 |
| 6,000,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Citigroup Commercial Mortgage Trust, Series 2014-GC25, Class B, 4.345%, 10/10/47 | &nbsp;&nbsp; 5646959 |
| 5,552,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Citigroup Commercial Mortgage Trust, Series 2015-GC33, Class B, 4.573%, 9/10/58 | &nbsp;&nbsp; 5118003 |
| 3,000,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Citigroup Commercial Mortgage Trust, Series 2018-B2, Class AS, 4.179%, 3/10/51 | &nbsp;&nbsp; 2729875 |
| 5012848 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Citigroup Commercial Mortgage Trust, Series 2018-C5, Class A3, 3.963%, 6/10/51 | &nbsp;&nbsp; 4663473 |
| 49,545,896(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;COMM Mortgage Trust, Series 2014-CR18, Class XA, 0.985%, 7/15/47 | &nbsp;&nbsp; 555281 |

---

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

36Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Commercial Mortgage-Backed<br> Securities—(continued)** |  |
| 4,130,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;COMM Mortgage Trust, Series 2015-DC1, Class B, 4.035%, 2/10/48 | $3813522 |
| 1,375,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;COMM Mortgage Trust, Series 2018-COR3, Class B, 4.512%, 5/10/51 | &nbsp;&nbsp; 1197209 |
| 662,423(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Freddie Mac Multifamily Structured Credit Risk, Series 2021-MN1, Class M1, 5.928% (SOFR30A + 200 bps), 1/25/51 (144A) | &nbsp;&nbsp; 619922 |
| 6,790,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Freddie Mac Multifamily Structured Credit Risk, Series 2021-MN3, Class M2, 7.928% (SOFR30A + 400 bps), 11/25/51 (144A) | &nbsp;&nbsp; 5959405 |
| 2,500,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FREMF Mortgage Trust, Series 2017-KW03, Class B, 4.074%, 7/25/27 (144A) | &nbsp;&nbsp; 2301626 |
| 4,071,496(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FREMF Mortgage Trust, Series 2018-KSW4, Class B, 6.592% (1 Month USD LIBOR + 245 bps), 10/25/28 | &nbsp;&nbsp; 3830185 |
| 2,189,712(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FREMF Mortgage Trust, Series 2018-KSW4, Class C, 9.142% (1 Month USD LIBOR + 500 bps), 10/25/28 | &nbsp;&nbsp; 2005805 |
| 4,590,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FREMF Mortgage Trust, Series 2019-K88, Class C, 4.383%, 2/25/52 (144A) | &nbsp;&nbsp; 4070970 |
| 4,106,918(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FREMF Mortgage Trust, Series 2019-KF64, Class B, 6.442% (1 Month USD LIBOR + 230 bps), 6/25/26 (144A) | &nbsp;&nbsp; 3994157 |
| 8,019,916(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FREMF Mortgage Trust, Series 2019-KF66, Class B, 6.542% (1 Month USD LIBOR + 240 bps), 7/25/29 (144A) | &nbsp;&nbsp; 7672414 |
| 2,850,345(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FREMF Mortgage Trust, Series 2019-KJ24, Class B, 7.60%, 10/25/27 (144A) | &nbsp;&nbsp; 2590986 |
| 5,000,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FREMF Mortgage Trust, Series 2019-KS12, Class C, 11.042% (1 Month USD LIBOR + 690 bps), 8/25/29 | &nbsp;&nbsp; 4490041 |
| 9,000,000(e) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FREMF Mortgage Trust, Series 2021-KG05, Class C, 0.000%, 1/25/31 (144A) | &nbsp;&nbsp; 4189628 |
| 110999571 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FREMF Mortgage Trust, Series 2021-KG05, Class X2A, 0.10%, 1/25/31 (144A) | &nbsp;&nbsp; 634784 |
| 9000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FREMF Mortgage Trust, Series 2021-KG05, Class X2B, 0.10%, 1/25/31 (144A) | &nbsp;&nbsp; 47409 |
| 3,367,973(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FRESB Mortgage Trust, Series 2018-SB52, Class A7F, 3.39%, 6/25/25 | &nbsp;&nbsp; 3234636 |
| 16,392,390(b)(c) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association, Series 2017-21, Class IO, 0.633%, 10/16/58 | &nbsp;&nbsp; 582767 |
| 4,885,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;GS Mortgage Securities Corportation Trust, Series 2021-IP, Class D, 6.418% (1 Month USD LIBOR + 210 bps), 10/15/36 (144A) | &nbsp;&nbsp; 4459957 |
| 8216000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ILPT Trust, Series 2019-SURF, Class A, 4.145%, 2/11/41 (144A) | &nbsp;&nbsp; 7407812 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2237

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Commercial Mortgage-Backed<br> Securities—(continued)** |  |
| 5685000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JP Morgan Chase Commercial Mortgage Securities Trust, Series 2016-JP3, Class AS, 3.144%, 8/15/49 | $4952135 |
| 5,435,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JP Morgan Chase Commercial Mortgage Securities Trust, Series 2018-BCON, Class C, 3.756%, 1/5/31 (144A) | &nbsp;&nbsp; 5426691 |
| 6150000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JP Morgan Chase Commercial Mortgage Securities Trust, Series 2018-WPT, Class AFX, 4.248%, 7/5/33 (144A) | &nbsp;&nbsp; 5744738 |
| 3,450,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JPMDB Commercial Mortgage Securities Trust, Series 2016-C2, Class B, 3.99%, 6/15/49 | &nbsp;&nbsp; 2862250 |
| 2,000,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JPMDB Commercial Mortgage Securities Trust, Series 2016-C4, Class D, 3.068%, 12/15/49 (144A) | &nbsp;&nbsp; 1423423 |
| 7010000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JPMDB Commercial Mortgage Securities Trust, Series 2018-C8, Class A4, 4.211%, 6/15/51 | &nbsp;&nbsp; 6619157 |
| 45,714,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JPMDB Commercial Mortgage Securities Trust, Series 2018-C8, Class XB, 0.147%, 6/15/51 | &nbsp;&nbsp; 250536 |
| 6560000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Key Commercial Mortgage Securities Trust, Series 2019-S2, Class A3, 3.469%, 6/15/52 (144A) | &nbsp;&nbsp; 5877178 |
| 12,700,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Med Trust, Series 2021-MDLN, Class E, 7.468% (1 Month USD LIBOR + 315 bps), 11/15/38 (144A) | &nbsp;&nbsp; 11776512 |
| 4,785,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Med Trust, Series 2021-MDLN, Class F, 8.318% (1 Month USD LIBOR + 400 bps), 11/15/38 (144A) | &nbsp;&nbsp; 4401087 |
| 2,250,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MF1 Multifamily Housing Mortgage Loan Trust, Series 2021-FL5, Class D, 6.95% (1 Month Term SOFR + 261 bps), 7/15/36 (144A) | &nbsp;&nbsp; 2088147 |
| 2,628,500(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Morgan Stanley Bank of America Merrill Lynch Trust, Series 2015-C21, Class C, 4.129%, 3/15/48 | &nbsp;&nbsp; 2190691 |
| 6,330,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Morgan Stanley Capital I Trust, Series 2018-MP, Class A, 4.276%, 7/11/40 (144A) | &nbsp;&nbsp; 5515514 |
| 2000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Palisades Center Trust, Series 2016-PLSD, Class A, 2.713%, 4/13/33 (144A) | &nbsp;&nbsp; 1310000 |
| 6,380,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ready Capital Mortgage Financing LLC, Series 2021-FL7, Class D, 7.339% (1 Month USD LIBOR + 295 bps), 11/25/36 (144A) | &nbsp;&nbsp; 5839999 |
| 6,285,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ready Capital Mortgage Financing LLC, Series 2022-FL8, Class D, 7.644% (SOFR30A + 370 bps), 1/25/37 (144A) | &nbsp;&nbsp; 5928327 |
| 280499 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ReadyCap Commercial Mortgage Trust, Series 2019-6, Class A, 2.833%, 10/25/52 (144A) | &nbsp;&nbsp; 259757 |
| 16245000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SLG Office Trust, Series 2021-OVA, Class E, 2.851%, 7/15/41 (144A) | &nbsp;&nbsp; 11315620 |
| 2,375,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Soho Trust, Series 2021-SOHO, Class A, 2.697%, 8/10/38 (144A) | &nbsp;&nbsp; 1842667 |

---

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

38Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Commercial Mortgage-Backed<br> Securities—(continued)** |  |
| 18,405,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Taubman Centers Commercial Mortgage Trust, Series 2022-DPM, Class B, 7.268% (1 Month Term SOFR + 293 bps), 5/15/37 (144A) | $17678299 |
| 1,774,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;UBS Commercial Mortgage Trust, Series 2018-C9, Class C, 4.954%, 3/15/51 | &nbsp;&nbsp; 1495258 |
| 28,996,104(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Wells Fargo Commercial Mortgage Trust, Series 2015-NXS3, Class XA, 0.878%, 9/15/57 | &nbsp;&nbsp; 568715 |
| 6683498 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Wells Fargo Commercial Mortgage Trust, Series 2016-C32, Class A3, 3.294%, 1/15/59 | &nbsp;&nbsp; 6281007 |
| 2,715,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Wells Fargo Commercial Mortgage Trust, Series 2018-C43, Class A4, 4.012%, 3/15/51 | &nbsp;&nbsp; 2555371 |
| 2795000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Wells Fargo Commercial Mortgage Trust, Series 2019-C51, Class A4, 3.311%, 6/15/52 | &nbsp;&nbsp; 2484467 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Commercial Mortgage-Backed Securities<br> (Cost $327,642,248)** | &nbsp;&nbsp; **$** **287504301** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Corporate Bonds — 28.2% of Net Assets** |  |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Advertising — 0.3%** |  |
| 11894000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Interpublic Group of Cos., Inc., 4.75%, 3/30/30 | $11220782 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Advertising** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **11220782** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Aerospace & Defense — 0.7%** |  |
| 19915000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Boeing Co., 3.75%, 2/1/50 | $13672819 |
| 13240000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Boeing Co., 3.90%, 5/1/49 | &nbsp;&nbsp; 9296664 |
| 7995000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Boeing Co., 5.805%, 5/1/50 | &nbsp;&nbsp; 7412771 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Aerospace & Defense** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **30382254** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Airlines — 0.4%** |  |
| 5050315 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Air Canada 2017-1 Class AA Pass Through Trust, 3.30%, 1/15/30 (144A) | $4311336 |
| 1320000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;American Airlines 2021-1 Class B Pass Through Trust, 3.95%, 7/11/30 | &nbsp;&nbsp; 1047338 |
| 2490000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Delta Air Lines, Inc./SkyMiles IP, Ltd., 4.75%, 10/20/28 (144A) | &nbsp;&nbsp; 2340533 |
| 4124180 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JetBlue 2019-1 Class AA Pass Through Trust, 2.75%, 5/15/32 | &nbsp;&nbsp; 3383192 |
| 1553128 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JetBlue 2020-1 Class A Pass Through Trust, 4.00%, 11/15/32 | &nbsp;&nbsp; 1380832 |
| 2095500 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;United Airlines 2020-1 Class B Pass Through Trust, 4.875%, 1/15/26 | &nbsp;&nbsp; 1993628 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2239

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Airlines — (continued)** |  |
| 1320000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;United Airlines, Inc., 4.375%, 4/15/26 (144A) | $1223542 |
| 1320000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;United Airlines, Inc., 4.625%, 4/15/29 (144A) | &nbsp;&nbsp; 1149318 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Airlines** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **16829719** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Auto Manufacturers — 0.4%** |  |
| 3640000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ford Motor Co., 6.10%, 8/19/32 | $3361021 |
| 6150000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ford Motor Credit Co. LLC, 3.625%, 6/17/31 | &nbsp;&nbsp; 4831182 |
| 6464000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;General Motors Co., 6.60%, 4/1/36 | &nbsp;&nbsp; 6330822 |
| 1605000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;General Motors Financial Co., Inc., 3.10%, 1/12/32 | &nbsp;&nbsp; 1257585 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Auto Manufacturers** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **15780610** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Banks — 9.7%** |  |
| 16,300,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ABN AMRO Bank NV, 2.47% (1 Year CMT Index + 110 bps), 12/13/29 (144A) | $13180629 |
| 2,600,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ABN AMRO Bank NV, 3.324% (5 Year CMT Index + 190 bps), 3/13/37 (144A) | &nbsp;&nbsp; 1879627 |
| 14,720,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;AIB Group Plc, 4.263% (3 Month USD LIBOR + 187 bps), 4/10/25 (144A) | &nbsp;&nbsp; 14202041 |
| 3,800,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ANZ Bank New Zealand, Ltd., 5.548% (5 Year CMT Index + 300 bps), 8/11/32 (144A) | &nbsp;&nbsp; 3689270 |
| 9413000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Banco Santander Chile, 2.70%, 1/10/25 (144A) | &nbsp;&nbsp; 8929238 |
| 3630000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Banco Santander Mexico SA Institucion de Banca Multiple Grupo Financiero Santand, 5.375%, 4/17/25 (144A) | &nbsp;&nbsp; 3591885 |
| 8,200,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Banco Santander SA, 1.722% (1 Year CMT Index + 90 bps), 9/14/27 | &nbsp;&nbsp; 7004165 |
| 2800000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Banco Santander SA, 2.749%, 12/3/30 | &nbsp;&nbsp; 2144523 |
| 17,000,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Banco Santander SA, 3.225% (1 Year CMT Index + 160 bps), 11/22/32 | &nbsp;&nbsp; 12836821 |
| 11,055,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Bank of America Corp., 2.572% (SOFR + 121 bps), 10/20/32 | &nbsp;&nbsp; 8658302 |
| 18,900,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Bank of America Corp., 2.884% (3 Month USD LIBOR + 119 bps), 10/22/30 | &nbsp;&nbsp; 15811268 |
| 4,385,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Bank of New York Mellon Corp., 5.834% (SOFR + 207 bps), 10/25/33 | &nbsp;&nbsp; 4545463 |
| 19,195,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Bank of Nova Scotia, 4.588% (5 Year CMT Index + 205 bps), 5/4/37 | &nbsp;&nbsp; 16380134 |
| 10,825,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Barclays Plc, 5.746% (5 Year CMT Index + 300 bps), 8/9/33 | &nbsp;&nbsp; 10225962 |
| 4,435,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Barclays Plc, 7.437% (1 Year CMT Index + 350 bps), 11/2/33 | &nbsp;&nbsp; 4646999 |
| 7,275,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BNP Paribas SA, 2.159% (SOFR + 122 bps), 9/15/29 (144A) | &nbsp;&nbsp; 5930735 |

---

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

40Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Banks — (continued)** |  |
| 11,470,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BPCE SA, 3.116% (SOFR + 173 bps), 10/19/32 (144A) | $8369264 |
| 5,625,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BPCE SA, 3.648% (5 Year CMT Index + 190 bps), 1/14/37 (144A) | &nbsp;&nbsp; 4203191 |
| 7,440,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Citigroup, Inc., 2.52% (SOFR + 118 bps), 11/3/32 | &nbsp;&nbsp; 5785856 |
| 5,530,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Citigroup, Inc., 4.91% (SOFR + 209 bps), 5/24/33 | &nbsp;&nbsp; 5178475 |
| 10,660,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Comerica Bank, 5.332% (SOFR + 261 bps), 8/25/33 | &nbsp;&nbsp; 10239681 |
| 7,000,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Goldman Sachs Group, Inc., 2.65% (SOFR + 126 bps), 10/21/32 | &nbsp;&nbsp; 5526986 |
| 5,815,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Goldman Sachs Group, Inc., 4.223% (3 Month USD LIBOR + 130 bps), 5/1/29 | &nbsp;&nbsp; 5417358 |
| 10,240,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;HSBC Holdings Plc, 2.206% (SOFR + 129 bps), 8/17/29 | &nbsp;&nbsp; 8265534 |
| 11,015,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;HSBC Holdings Plc, 2.871% (SOFR + 141 bps), 11/22/32 | &nbsp;&nbsp; 8418097 |
| 1,835,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;HSBC Holdings Plc, 5.402% (SOFR + 287 bps), 8/11/33 | &nbsp;&nbsp; 1699252 |
| 1,800,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ING Groep NV, 4.252% (SOFR + 207 bps), 3/28/33 | &nbsp;&nbsp; 1584742 |
| 15,574,000(b)(f) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ING Groep NV, 4.25% (5 Year CMT Index + 286 bps) | &nbsp;&nbsp; 10687756 |
| 900,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Intesa Sanpaolo S.p.A., 4.198% (1 Year CMT Index + 260 bps), 6/1/32 (144A) | &nbsp;&nbsp; 661237 |
| 4,695,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Intesa Sanpaolo S.p.A., 4.95% (5 Year CMT Index + 275 bps), 6/1/42 (144A) | &nbsp;&nbsp; 3014889 |
| 6,480,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Intesa Sanpaolo S.p.A., 8.248% (1 Year CMT Index + 440 bps), 11/21/33 (144A) | &nbsp;&nbsp; 6573903 |
| 9,060,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JPMorgan Chase & Co., 2.545% (SOFR + 118 bps), 11/8/32 | &nbsp;&nbsp; 7161305 |
| 2,960,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JPMorgan Chase & Co., 4.586% (SOFR + 180 bps), 4/26/33 | &nbsp;&nbsp; 2740259 |
| 5900000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;KeyBank NA, 4.90%, 8/8/32 | &nbsp;&nbsp; 5460203 |
| 5,400,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Lloyds Banking Group Plc, 4.976% (5 Year CMT Index + 230 bps), 8/11/33 | &nbsp;&nbsp; 4958228 |
| 8,408,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Lloyds Banking Group Plc, 7.953% (1 Year CMT Index + 375 bps), 11/15/33 | &nbsp;&nbsp; 8899880 |
| 9,860,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Macquarie Group, Ltd., 2.691% (SOFR + 144 bps), 6/23/32 (144A) | &nbsp;&nbsp; 7566115 |
| 6,190,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Macquarie Group, Ltd., 2.871% (SOFR + 153 bps), 1/14/33 (144A) | &nbsp;&nbsp; 4748861 |
| 3,490,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Mitsubishi UFJ Financial Group, Inc., 2.494% (1 Year CMT Index + 97 bps), 10/13/32 | &nbsp;&nbsp; 2719258 |
| 4,030,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Mizuho Financial Group, Inc., 5.669% (5 Year CMT Index + 240 bps), 9/13/33 | &nbsp;&nbsp; 3998873 |
| 9,845,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Morgan Stanley, 5.297% (SOFR + 262 bps), 4/20/37 | &nbsp;&nbsp; 9001863 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2241

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Banks — (continued)** |  |
| 10,926,000(b)(f) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Nordea Bank Abp, 3.75% (5 Year CMT Index + 260 bps) (144A) | $8435450 |
| 6,210,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Santander Holdings USA, Inc., 2.49% (SOFR + 125 bps), 1/6/28 | &nbsp;&nbsp; 5328072 |
| 2,195,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Societe Generale SA, 2.797% (1 Year CMT Index + 130 bps), 1/19/28 (144A) | &nbsp;&nbsp; 1920420 |
| 3,095,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Societe Generale SA, 4.027% (1 Year CMT Index + 190 bps), 1/21/43 (144A) | &nbsp;&nbsp; 2094197 |
| 4,550,000(b)(f) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Societe Generale SA, 5.375% (5 Year CMT Index + 451 bps) (144A) | &nbsp;&nbsp; 3686122 |
| 8,090,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Societe Generale SA, 6.221% (1 Year CMT Index + 320 bps), 6/15/33 (144A) | &nbsp;&nbsp; 7566452 |
| 17,125,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Standard Chartered Plc, 3.603% (1 Year CMT Index + 190 bps), 1/12/33 (144A) | &nbsp;&nbsp; 12878013 |
| 2,100,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;State Street Corp., 4.421% (SOFR + 161 bps), 5/13/33 | &nbsp;&nbsp; 1987113 |
| 8350000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Toronto-Dominion Bank, 4.456%, 6/8/32 | &nbsp;&nbsp; 7958966 |
| 5,415,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Toronto-Dominion Bank, 8.125% (5 Year CMT Index + 408 bps), 10/31/82 | &nbsp;&nbsp; 5631600 |
| 15,765,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Truist Financial Corp., 4.916% (SOFR + 224 bps), 7/28/33 | &nbsp;&nbsp; 14787452 |
| 12,330,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;UBS Group AG, 2.746% (1 Year CMT Index + 110 bps), 2/11/33 (144A) | &nbsp;&nbsp; 9529222 |
| 2,615,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;UBS Group AG, 4.988% (5 Year CMT Index + 240 bps), 8/5/33 (144A) | &nbsp;&nbsp; 2420657 |
| 19,295,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;UniCredit S.p.A., 2.569% (1 Year CMT Index + 230 bps), 9/22/26 (144A) | &nbsp;&nbsp; 17086188 |
| 4,578,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;UniCredit S.p.A., 5.459% (5 Year CMT Index + 475 bps), 6/30/35 (144A) | &nbsp;&nbsp; 3719387 |
| 7,483,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;UniCredit S.p.A., 7.296% (5 Year USD 1100 Run ICE Swap Rate + 491 bps), 4/2/34 (144A) | &nbsp;&nbsp; 6858111 |
| 17,775,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;US Bancorp, 2.491% (5 Year CMT Index + 95 bps), 11/3/36 | &nbsp;&nbsp; 13526272 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Banks** | &nbsp;&nbsp; **$** **401951822** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Biotechnology — 0.3%** |  |
| 2429000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Bio-Rad Laboratories, Inc., 3.70%, 3/15/32 | $2080489 |
| 5780000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CSL Finance Plc, 4.25%, 4/27/32 (144A) | &nbsp;&nbsp; 5442572 |
| 3995000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Grifols Escrow Issuer SA, 4.75%, 10/15/28 (144A) | &nbsp;&nbsp; 3449563 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Biotechnology** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **10972624** |

---

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

42Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Building Materials — 0.2%** |  |
| 5017000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Builders FirstSource, Inc., 6.375%, 6/15/32 (144A) | $4712198 |
| 4490000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Fortune Brands Innovations, Inc., 4.50%, 3/25/52 | &nbsp;&nbsp; 3370896 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Building Materials** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **8083094** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Chemicals — 0.6%** |  |
| 16840000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Albemarle Corp., 5.65%, 6/1/52 | $15322061 |
| 3320000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Celanese US Holdings LLC, 6.379%, 7/15/32 | &nbsp;&nbsp; 3157147 |
| 3208000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;NOVA Chemicals Corp., 5.25%, 6/1/27 (144A) | &nbsp;&nbsp; 2881499 |
| 5340000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Tronox, Inc., 4.625%, 3/15/29 (144A) | &nbsp;&nbsp; 4438875 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Chemicals** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **25799582** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Commercial Services — 0.6%** |  |
| 3646000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Allied Universal Holdco LLC/Allied Universal Finance Corp., 6.625%, 7/15/26 (144A) | $3336090 |
| 2115000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Allied Universal Holdco LLC/Allied Universal Finance Corp./Atlas Luxco 4 S.a.r.l., 4.625%, 6/1/28 (144A) | &nbsp;&nbsp; 1746842 |
| 1230000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Allied Universal Holdco LLC/Allied Universal Finance Corp./Atlas Luxco 4 S.a.r.l., 4.625%, 6/1/28 (144A) | &nbsp;&nbsp; 997214 |
| 4500000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ashtead Capital, Inc., 5.50%, 8/11/32 (144A) | &nbsp;&nbsp; 4304111 |
| 3080000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CoreLogic, Inc., 4.50%, 5/1/28 (144A) | &nbsp;&nbsp; 2362976 |
| 6660000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Garda World Security Corp., 4.625%, 2/15/27 (144A) | &nbsp;&nbsp; 5880647 |
| 5385000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Prime Security Services Borrower LLC/Prime Finance, Inc., 6.25%, 1/15/28 (144A) | &nbsp;&nbsp; 4901212 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Commercial Services** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **23529092** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Diversified Financial Services — 2.1%** |  |
| 6710000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;AerCap Ireland Capital DAC/AerCap Global Aviation Trust, 3.30%, 1/30/32 | $5245615 |
| 7725000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Air Lease Corp., 2.10%, 9/1/28 | &nbsp;&nbsp; 6291992 |
| 4915000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Air Lease Corp., 2.875%, 1/15/32 | &nbsp;&nbsp; 3904625 |
| 6235000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Air Lease Corp., 3.125%, 12/1/30 | &nbsp;&nbsp; 5166923 |
| 11780000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ally Financial, Inc., 4.75%, 6/9/27 | &nbsp;&nbsp; 11041582 |
| 905000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Avolon Holdings Funding, Ltd., 3.95%, 7/1/24 (144A) | &nbsp;&nbsp; 866357 |
| 6515000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B3 SA - Brasil Bolsa Balcao, 4.125%, 9/20/31 (144A) | &nbsp;&nbsp; 5489822 |
| 8534000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Bread Financial Holdings, Inc., 7.00%, 1/15/26 (144A) | &nbsp;&nbsp; 7424580 |
| 3,750,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Capital One Financial Corp., 5.247% (SOFR + 260 bps), 7/26/30 | &nbsp;&nbsp; 3571300 |
| 9,235,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Capital One Financial Corp., 5.268% (SOFR + 237 bps), 5/10/33 | &nbsp;&nbsp; 8578586 |
| 14325000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Nomura Holdings, Inc., 2.999%, 1/22/32 | &nbsp;&nbsp; 11238761 |
| 4645000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Nomura Holdings, Inc., 5.605%, 7/6/29 | &nbsp;&nbsp; 4561640 |
| 4020000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;OneMain Finance Corp., 3.50%, 1/15/27 | &nbsp;&nbsp; 3328440 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2243

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Diversified Financial Services — (continued)** |  |
| 2,755,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;OWS Cre Funding I LLC, 9.269% (1 Month USD LIBOR + 490 bps), 9/1/23 (144A) | $2630872 |
| 8559000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;United Wholesale Mortgage LLC, 5.50%, 4/15/29 (144A) | &nbsp;&nbsp; 6808515 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Diversified Financial Services** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **86149610** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Electric — 1.2%** |  |
| 8170000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;AES Corp., 2.45%, 1/15/31 | $6499408 |
| 2955000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;AES Corp., 3.95%, 7/15/30 (144A) | &nbsp;&nbsp; 2606310 |
| 6,305,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Algonquin Power & Utilities Corp., 4.75% (5 Year CMT Index + 325 bps), 1/18/82 | &nbsp;&nbsp; 5107050 |
| 3090000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Enel Finance International NV, 7.75%, 10/14/52 (144A) | &nbsp;&nbsp; 3301004 |
| 2125000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Entergy Louisiana LLC, 4.75%, 9/15/52 | &nbsp;&nbsp; 1906725 |
| 3820000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Niagara Mohawk Power Corp., 5.783%, 9/16/52 (144A) | &nbsp;&nbsp; 3806711 |
| 8840000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;NRG Energy, Inc., 2.45%, 12/2/27 (144A) | &nbsp;&nbsp; 7324425 |
| 7410000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;NRG Energy, Inc., 3.875%, 2/15/32 (144A) | &nbsp;&nbsp; 5565280 |
| 6870000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Puget Energy, Inc., 2.379%, 6/15/28 | &nbsp;&nbsp; 5845508 |
| 7185000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Puget Energy, Inc., 4.10%, 6/15/30 | &nbsp;&nbsp; 6415926 |
| 2120000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Puget Energy, Inc., 4.224%, 3/15/32 | &nbsp;&nbsp; 1881391 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Electric** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **50259738** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Electrical Components & Equipments — 0.0%†** |  |
| 1990000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Energizer Holdings, Inc., 6.50%, 12/31/27 (144A) | $1893861 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Electrical Components & Equipments** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **1893861** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Electronics — 0.0%†** |  |
| 1885000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Atkore, Inc., 4.25%, 6/1/31 (144A) | $1616387 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Electronics** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **1616387** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Energy-Alternate Sources — 0.1%** |  |
| 4548574 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Adani Renewable Energy RJ, Ltd./Kodangal Solar Parks Pvt, Ltd./Wardha Solar Maharash, 4.625%, 10/15/39 (144A) | $3388688 |
| 254867 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Alta Wind Holdings LLC, 7.00%, 6/30/35 (144A) | &nbsp;&nbsp; 251883 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Energy-Alternate Sources** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **3640571** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Entertainment — 0.2%** |  |
| 8400000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Resorts World Las Vegas LLC/RWLV Capital, Inc., 4.625%, 4/16/29 (144A) | $5957528 |
| 2700000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Resorts World Las Vegas LLC/RWLV Capital, Inc., 4.625%, 4/6/31 (144A) | &nbsp;&nbsp; 1823797 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Entertainment** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **7781325** |

---

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

44Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Food — 0.6%** |  |
| 3430000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JBS USA LUX SA/JBS USA Food Co./JBS USA Finance, Inc., 3.00%, 2/2/29 (144A) | $2838821 |
| 1654000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JBS USA LUX SA/JBS USA Food Co./JBS USA Finance, Inc., 3.00%, 5/15/32 (144A) | &nbsp;&nbsp; 1268371 |
| 7490000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JBS USA LUX SA/JBS USA Food Co./JBS USA Finance, Inc., 5.75%, 4/1/33 (144A) | &nbsp;&nbsp; 7143812 |
| 2335000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JBS USA LUX SA/JBS USA Food Co./JBS USA Finance, Inc., 6.50%, 12/1/52 (144A) | &nbsp;&nbsp; 2222480 |
| 5405000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Minerva Luxembourg SA, 4.375%, 3/18/31 (144A) | &nbsp;&nbsp; 4435505 |
| 6070000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Smithfield Foods, Inc., 2.625%, 9/13/31 (144A) | &nbsp;&nbsp; 4341306 |
| 5935000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Smithfield Foods, Inc., 3.00%, 10/15/30 (144A) | &nbsp;&nbsp; 4518868 |
| 668000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Smithfield Foods, Inc., 5.20%, 4/1/29 (144A) | &nbsp;&nbsp; 610218 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Food** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **27379381** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Forest Products & Paper — 0.1%** |  |
| 2728000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Inversiones CMPC SA, 3.85%, 1/13/30 (144A) | $2469532 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Forest Products & Paper** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **2469532** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Gas — 0.1%** |  |
| 2810000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Boston Gas Co., 3.15%, 8/1/27 (144A) | $2525283 |
| 1625502 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Nakilat, Inc., 6.267%, 12/31/33 (144A) | &nbsp;&nbsp; 1683207 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Gas** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **4208490** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Hand & Machine Tools — 0.1%** |  |
| 3559000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Kennametal, Inc., 2.80%, 3/1/31 | $2779733 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Hand & Machine Tools** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **2779733** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Healthcare-Products — 0.2%** |  |
| 2139000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Edwards Lifesciences Corp., 4.30%, 6/15/28 | $2044890 |
| 10178000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Smith & Nephew Plc, 2.032%, 10/14/30 | &nbsp;&nbsp; 7955441 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Healthcare-Products** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **10000331** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Healthcare-Services — 0.4%** |  |
| 2500000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Elevance Health, Inc., 6.10%, 10/15/52 | $2665179 |
| 16810000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Fresenius Medical Care US Finance III, Inc., 2.375%, 2/16/31 (144A) | &nbsp;&nbsp; 12328201 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Healthcare-Services** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **14993380** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Insurance — 1.5%** |  |
| 1683000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Aon Corp./Aon Global Holdings Plc, 2.60%, 12/2/31 | $1373678 |
| 13975000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CNO Global Funding, 2.65%, 1/6/29 (144A) | &nbsp;&nbsp; 11822849 |
| 2,720,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Farmers Exchange Capital III, 5.454% (3 Month USD LIBOR + 345 bps), 10/15/54 (144A) | &nbsp;&nbsp; 2481334 |
| 8,910,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Farmers Insurance Exchange, 4.747% (3 Month USD LIBOR + 323 bps), 11/1/57 (144A) | &nbsp;&nbsp; 7162614 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2245

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Insurance — (continued)** |  |
| 16962000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Liberty Mutual Insurance Co., 7.697%, 10/15/97 (144A) | $18319733 |
| 14190000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Nationwide Mutual Insurance Co., 4.35%, 4/30/50 (144A) | &nbsp;&nbsp; 10598750 |
| 9,700,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Nippon Life Insurance Co., 2.90% (5 Year CMT Index + 260 bps), 9/16/51 (144A) | &nbsp;&nbsp; 7758352 |
| 2590000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Primerica, Inc., 2.80%, 11/19/31 | &nbsp;&nbsp; 2108138 |
| 635000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Teachers Insurance & Annuity Association of America, 6.85%, 12/16/39 (144A) | &nbsp;&nbsp; 698918 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Insurance** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **62324366** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Iron & Steel — 0.1%** |  |
| 2185000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Cleveland-Cliffs, Inc., 4.875%, 3/1/31 (144A) | $1929335 |
| 2136000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Commercial Metals Co., 4.375%, 3/15/32 | &nbsp;&nbsp; 1858163 |
| 1065000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Mineral Resources, Ltd., 8.00%, 11/1/27 (144A) | &nbsp;&nbsp; 1088984 |
| 1130000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Mineral Resources, Ltd., 8.50%, 5/1/30 (144A) | &nbsp;&nbsp; 1145289 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Iron & Steel** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **6021771** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Lodging — 0.4%** |  |
| 14805000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Marriott International, Inc., 3.50%, 10/15/32 | $12315739 |
| 2845000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Marriott International, Inc., 4.625%, 6/15/30 | &nbsp;&nbsp; 2654709 |
| 1720000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sands China, Ltd., 4.875%, 6/18/30 | &nbsp;&nbsp; 1511502 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Lodging** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **16481950** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Machinery-Construction & Mining — 0.1%** |  |
| 5155000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Weir Group Plc, 2.20%, 5/13/26 (144A) | $4571690 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Machinery-Construction & Mining** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **4571690** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Media — 0.4%** |  |
| 1085000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CCO Holdings LLC/CCO Holdings Capital Corp., 4.50%, 6/1/33 (144A) | $832445 |
| 7800000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CCO Holdings LLC/CCO Holdings Capital Corp., 4.75%, 3/1/30 (144A) | &nbsp;&nbsp; 6726837 |
| 4380000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Charter Communications Operating LLC/Charter Communications Operating Capital, 4.40%, 4/1/33 | &nbsp;&nbsp; 3747787 |
| 5325000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CSC Holdings LLC, 4.625%, 12/1/30 (144A) | &nbsp;&nbsp; 2942776 |
| 2125000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CSC Holdings LLC, 5.00%, 11/15/31 (144A) | &nbsp;&nbsp; 1187238 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Media** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **15437083** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Mining — 0.4%** |  |
| 5890000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Anglo American Capital Plc, 2.25%, 3/17/28 (144A) | $4953205 |
| 4475000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Anglo American Capital Plc, 4.75%, 3/16/52 (144A) | &nbsp;&nbsp; 3715438 |

---

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

46Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Mining — (continued)** |  |
| 4092000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;AngloGold Ashanti Holdings Plc, 3.75%, 10/1/30 | $3549133 |
| 3959000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FMG Resources August 2006 Pty, Ltd., 4.375%, 4/1/31 (144A) | &nbsp;&nbsp; 3292635 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Mining** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **15510411** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Miscellaneous Manufacturing — 0.3%** |  |
| 3210000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Eaton Corp., 4.70%, 8/23/52 | $2904258 |
| 11027000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Teledyne Technologies, Inc., 2.25%, 4/1/28 | &nbsp;&nbsp; 9494548 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Miscellaneous Manufacturing** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **12398806** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Multi-National — 0.3%** |  |
| 5565000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;African Export-Import Bank, 3.994%, 9/21/29 (144A) | $4823185 |
| 6560000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Banque Ouest Africaine de Developpement, 4.70%, 10/22/31 (144A) | &nbsp;&nbsp; 5573376 |
| 2030000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Banque Ouest Africaine de Developpement, 5.00%, 7/27/27 (144A) | &nbsp;&nbsp; 1903775 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Multi-National** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **12300336** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Oil & Gas — 0.9%** |  |
| 18980000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Aker BP ASA, 3.10%, 7/15/31 (144A) | $15565941 |
| 1225000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Harbour Energy Plc, 5.50%, 10/15/26 (144A) | &nbsp;&nbsp; 1097747 |
| 2580000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Lundin Energy Finance BV, 2.00%, 7/15/26 (144A) | &nbsp;&nbsp; 2278942 |
| 11125000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Phillips 66 Co., 3.75%, 3/1/28 (144A) | &nbsp;&nbsp; 10239331 |
| 7773000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Valero Energy Corp., 6.625%, 6/15/37 | &nbsp;&nbsp; 8271529 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Oil & Gas** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **37453490** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Oil & Gas Services — 0.0%†** |  |
| 2065000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Halliburton Co., 7.60%, 8/15/96 (144A) | $1932237 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Oil & Gas Services** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **1932237** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Pharmaceuticals — 0.1%** |  |
| 2720000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Teva Pharmaceutical Finance Netherlands III BV, 4.75%, 5/9/27 | $2458607 |
| 2720000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Teva Pharmaceutical Finance Netherlands III BV, 5.125%, 5/9/29 | &nbsp;&nbsp; 2422288 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Pharmaceuticals** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **4880895** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Pipelines — 2.2%** |  |
| 2265000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Boardwalk Pipelines LP, 3.60%, 9/1/32 | $1874280 |
| 2930000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Energy Transfer LP, 4.15%, 9/15/29 | &nbsp;&nbsp; 2646868 |
| 13251000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Energy Transfer LP, 4.95%, 5/15/28 | &nbsp;&nbsp; 12709591 |
| 4800000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Energy Transfer LP, 5.35%, 5/15/45 | &nbsp;&nbsp; 4070578 |
| 3750000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Energy Transfer LP, 6.00%, 6/15/48 | &nbsp;&nbsp; 3380429 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2247

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Pipelines — (continued)** |  |
| 14,417,000(b)(f) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Energy Transfer LP, 7.125% (5 Year CMT Index + 531 bps) | $12038195 |
| 7631000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;EnLink Midstream Partners LP, 5.45%, 6/1/47 | &nbsp;&nbsp; 6129601 |
| 3944000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;EnLink Midstream Partners LP, 5.60%, 4/1/44 | &nbsp;&nbsp; 3252880 |
| 16180000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Kinder Morgan, Inc., 5.45%, 8/1/52 | &nbsp;&nbsp; 14522824 |
| 9120000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MPLX LP, 4.25%, 12/1/27 | &nbsp;&nbsp; 8617684 |
| 7725000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MPLX LP, 4.95%, 3/14/52 | &nbsp;&nbsp; 6310120 |
| 6295000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;NGPL PipeCo LLC, 3.25%, 7/15/31 (144A) | &nbsp;&nbsp; 5120372 |
| 2270000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Williams Cos., Inc., 7.75%, 6/15/31 | &nbsp;&nbsp; 2503089 |
| 7360000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Williams Cos., Inc., 7.50%, 1/15/31 | &nbsp;&nbsp; 8056089 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Pipelines** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **91232600** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**REITs — 0.8%** |  |
| 1955000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;GLP Capital LP/GLP Financing II, Inc., 3.25%, 1/15/32 | $1562797 |
| 4748000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;HAT Holdings I LLC/HAT Holdings II LLC, 3.375%, 6/15/26 (144A) | &nbsp;&nbsp; 4125062 |
| 8169000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Healthcare Realty Holdings LP, 3.10%, 2/15/30 | &nbsp;&nbsp; 6820822 |
| 1450000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Highwoods Realty LP, 2.60%, 2/1/31 | &nbsp;&nbsp; 1085277 |
| 2539000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Highwoods Realty LP, 4.125%, 3/15/28 | &nbsp;&nbsp; 2293119 |
| 7870000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;LXP Industrial Trust, 2.375%, 10/1/31 | &nbsp;&nbsp; 5966337 |
| 4880000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;LXP Industrial Trust, 2.70%, 9/15/30 | &nbsp;&nbsp; 3887170 |
| 3420000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sun Communities Operating LP, 2.30%, 11/1/28 | &nbsp;&nbsp; 2847065 |
| 4865000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;UDR, Inc., 4.40%, 1/26/29 | &nbsp;&nbsp; 4547046 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total REITs** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **33134695** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Retail — 0.7%** |  |
| 1675000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;AutoNation, Inc., 1.95%, 8/1/28 | $1335738 |
| 1675000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;AutoNation, Inc., 2.40%, 8/1/31 | &nbsp;&nbsp; 1204344 |
| 7335000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;AutoNation, Inc., 3.85%, 3/1/32 | &nbsp;&nbsp; 5854626 |
| 3775000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;AutoNation, Inc., 4.75%, 6/1/30 | &nbsp;&nbsp; 3368035 |
| 11070000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Dollar Tree, Inc., 2.65%, 12/1/31 | &nbsp;&nbsp; 8953725 |
| 8895000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Lowe's Cos., Inc., 3.75%, 4/1/32 | &nbsp;&nbsp; 7912446 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Retail** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **28628914** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Semiconductors — 0.6%** |  |
| 978000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Broadcom, Inc., 3.137%, 11/15/35 (144A) | $719090 |
| 14123000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Broadcom, Inc., 3.187%, 11/15/36 (144A) | &nbsp;&nbsp; 10144379 |
| 3930000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Broadcom, Inc., 4.15%, 4/15/32 (144A) | &nbsp;&nbsp; 3449983 |
| 2960000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Broadcom, Inc., 4.30%, 11/15/32 | &nbsp;&nbsp; 2608768 |
| 8577000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Skyworks Solutions, Inc., 3.00%, 6/1/31 | &nbsp;&nbsp; 6727210 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Semiconductors** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **23649430** |

---

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

48Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Software — 0.3%** |  |
| 14250000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Autodesk, Inc., 2.40%, 12/15/31 | $11383236 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Software** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **11383236** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Telecommunications — 0.7%** |  |
| 1945000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Altice France SA, 5.125%, 7/15/29 (144A) | $1458251 |
| 7584000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Altice France SA, 5.50%, 1/15/28 (144A) | &nbsp;&nbsp; 5939182 |
| 2673000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Level 3 Financing, Inc., 4.625%, 9/15/27 (144A) | &nbsp;&nbsp; 2225273 |
| 9430000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Motorola Solutions, Inc., 2.30%, 11/15/30 | &nbsp;&nbsp; 7373815 |
| 4420000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Motorola Solutions, Inc., 5.60%, 6/1/32 | &nbsp;&nbsp; 4302636 |
| 5250000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;T-Mobile USA, Inc., 2.70%, 3/15/32 | &nbsp;&nbsp; 4241712 |
| 4265000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;T-Mobile USA, Inc., 5.20%, 1/15/33 | &nbsp;&nbsp; 4226546 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Telecommunications** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **29767415** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Trucking & Leasing — 0.1%** |  |
| 6820000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Penske Truck Leasing Co. LP/PTL Finance Corp., 4.40%, 7/1/27 (144A) | $6471798 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Trucking & Leasing** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **6471798** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Corporate Bonds<br> (Cost $1,386,388,365)** | **$1171303041** |

---

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Shares** |  |  |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Convertible Preferred Stocks — 0.8% of<br> Net Assets** |  |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Banks — 0.8%** |  |
| 2,798(f) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Bank of America Corp., 7.25% | $3245680 |
| 26,827(f) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Wells Fargo & Co., 7.50% | &nbsp;&nbsp; 31789995 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Banks** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **35035675** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Convertible Preferred Stocks<br> (Cost $38,718,832)** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **35035675** |

---

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  |  |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Municipal Bonds — 0.9% of Net Assets(g)** |  |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Arizona — 0.1%** |  |
| 2710000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Maricopa County Industrial Development Authority, Banner Health, Series 2019F, 3.00%, 1/1/49 | $1919195 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Arizona** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$1919195** |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2249

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**California — 0.1%** |  |
| 2785000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;California Health Facilities Financing Authority, Cedars-Sinai Health System, Series A, 3.00%, 8/15/51 | $2127796 |
| 1395000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Regents of the University of California, Medical Center Pooled Revenue, Series P, 4.00%, 5/15/53 | &nbsp;&nbsp; 1319098 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total California** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$3446894** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Florida — 0.0%†** |  |
| 2090000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;South Broward Hospital District, South Broward Hospital District Obligated Group, Series A, 2.50%, 5/1/47 | $1348363 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Florida** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$1348363** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Georgia — 0.0%†** |  |
| 1205000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gainesville & Hall County Hospital Authority, Northeast Georgia Health System, Inc. Project, Series A, 3.00%, 2/15/51 | $859864 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Georgia** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$859864** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Massachusetts — 0.0%†** |  |
| 2,210,000(h) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Commonwealth of Massachusetts, Series B, 3.00%, 4/1/47 | $1664572 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Massachusetts** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$1664572** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Missouri — 0.0%†** |  |
| 555000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Health & Educational Facilities Authority of the State of Missouri, BJC Health System, Series A, 3.00%, 7/1/38 | $467693 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Missouri** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$467693** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Nebraska — 0.1%** |  |
| 1,100,000(h) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Lancaster County School District 001, Lincoln Public Schools, 2.00%, 1/15/43 | $698082 |
| 4105000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;University of Nebraska Facilities Corp., Green Bond, Series B, 3.00%, 7/15/54 | &nbsp;&nbsp; 2964056 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Nebraska** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$3662138** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**New Jersey — 0.1%** |  |
| 1395000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;New Jersey Health Care Facilities Financing Authority, Atlanticare Health System Obligated Group Issue, 3.00%, 7/1/46 | $990087 |
| 3000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;New Jersey Health Care Facilities Financing Authority, RWJ Barnabas Health Obligated Group Issue, 3.00%, 7/1/51 | &nbsp;&nbsp; 2141430 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total New Jersey** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$3131517** |

---

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

50Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**New York — 0.0%†** |  |
| 2205000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;New York State Thruway Authority, Series A-1, 3.00%, 3/15/50 | $1666341 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total New York** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$1666341** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**North Carolina — 0.1%** |  |
| 2215000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;City of Charlotte Airport Revenue, Charlotte Douglas International Airport Revenue, Series A, 4.00%, 7/1/47 | $2054058 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total North Carolina** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$2054058** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Oregon — 0.0%†** |  |
| 1950000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Oregon Health & Science University, Green Bond, Series A, 3.00%, 7/1/51 | $1446237 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Oregon** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$1446237** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Pennsylvania — 0.1%** |  |
| 4175000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Montgomery County Higher Education and Health Authority, Thomas Jefferson University, Series B, 4.00%, 5/1/56 | $3436442 |
| 930000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pennsylvania Turnpike Commission, Series C, 3.00%, 12/1/51 | &nbsp;&nbsp; 676073 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Pennsylvania** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$4112515** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Tennessee — 0.0%†** |  |
| 305000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;City of Memphis TN Water Revenue, Memphis Light, Gas and Water Division, 3.00%, 12/1/45 | $244363 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Tennessee** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$244363** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Texas — 0.1%** |  |
| 3760000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Harris County Cultural Education Facilities Finance Corp., Texas Children's Hospital, 3.00%, 10/1/51 | $2645799 |
| 1395000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Texas Water Development Board, State Revolving Fund, 3.00%, 8/1/40 | &nbsp;&nbsp; 1207568 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Texas** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$3853367** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Virginia — 0.2%** |  |
| 945000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Hampton Roads Transportation Accountability Commission, Series A, 4.00%, 7/1/57 | $855036 |
| 1670000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Roanoke Economic Development Authority, Carilion Clinic Obligated Group, 3.00%, 7/1/45 | &nbsp;&nbsp; 1253636 |
| 710000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Rockingham County Economic Development Authority, Sentara RMH Medical Center, Series A, 3.00%, 11/1/46 | &nbsp;&nbsp; 535219 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2251

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Virginia — (continued)** |  |
| 2860000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Virginia College Building Authority, Public Higher Education Financing Program, Series C, 3.00%, 9/1/51 | $2148661 |
| 2335000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Virginia Commonwealth Transportation Board, Transportation Capital Projects, 4.00%, 5/15/32 | &nbsp;&nbsp; 2364374 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Virginia** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$7156926** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Municipal Bonds<br> (Cost $38,864,289)** | &nbsp;&nbsp;&nbsp;&nbsp; **$37034043** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Insurance-Linked Securities — 3.4% of<br> Net Assets#** |  |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Event Linked Bonds — 0.9%** |  |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Earthquakes – California — 0.1%** |  |
| 1,000,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Phoenician Re, 7.241%, (3 Month U.S. Treasury Bill + 290 bps), 12/14/24 (144A) | $914800 |
| 1,750,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sutter Re, 9.343%, (3 Month U.S. Treasury Bill + 500 bps), 5/23/23 (144A) | &nbsp;&nbsp; 1697150 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; $2611950 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Earthquakes – Mexico — 0.0%†** |  |
| 250,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;International Bank for Reconstruction & Development, 8.153%, (3 Month USD LIBOR + 350 bps), 3/13/24 (144A) | $240400 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Earthquakes - U.S. — 0.0%†** |  |
| 500,000(b) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Veraison Re, 2.50%, (1 Month U.S. Treasury Bill + 250 bps), 3/9/26 (144A) | $499750 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Health – U.S. — 0.1%** |  |
| 3,000,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Vitality Re X, 6.093%, (3 Month U.S. Treasury Bill + 175 bps), 1/10/23 (144A) | $2999700 |
| 500,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Vitality Re X, 6.343%, (3 Month U.S. Treasury Bill + 200 bps), 1/10/23 (144A) | &nbsp;&nbsp; 499950 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; $3499650 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Inland Flood – U.S. — 0.1%** |  |
| 2,000,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FloodSmart Re, 15.593%, (3 Month U.S. Treasury Bill + 1,125 bps), 2/25/25 (144A) | $1860000 |
| 1,250,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FloodSmart Re, 17.923%, (3 Month U.S. Treasury Bill + 1,358 bps), 3/1/24 (144A) | &nbsp;&nbsp; 1125000 |
| 750,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FloodSmart Re, 19.423%, (3 Month U.S. Treasury Bill + 1,508 bps), 2/27/23 (144A) | &nbsp;&nbsp; 675000 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; $3660000 |

---

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

52Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Multiperil – U.S. — 0.4%** |  |
| 100,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Caelus Re V, 4.443%, (1 Month U.S. Treasury Bill + 10 bps), 6/5/24 (144A) | $80000 |
| 250,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Easton Re Pte, 8.343%, (3 Month U.S. Treasury Bill + 400 bps), 1/8/24 (144A) | &nbsp;&nbsp; 233700 |
| 500,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Four Lakes Re, 9.093%, (3 Month U.S. Treasury Bill + 475 bps), 1/7/25 (144A) | &nbsp;&nbsp; 459700 |
| 3,000,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Four Lakes Re, 10.843%, (3 Month U.S. Treasury Bill + 650 bps), 1/7/26 (144A) | &nbsp;&nbsp; 2999700 |
| 500,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Herbie Re, 14.063%, (3 Month U.S. Treasury Bill + 972 bps), 1/8/25 (144A) | &nbsp;&nbsp; 425000 |
| 2,000,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Matterhorn Re, 9.572%, (SOFR + 532 bps), 3/24/25 (144A) | &nbsp;&nbsp; 1721400 |
| 1,000,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Matterhorn Re, 12.072%, (SOFR + 775 bps), 3/24/25 (144A) | &nbsp;&nbsp; 853700 |
| 3,400,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Mystic Re IV, 4.843%, (3 Month U.S. Treasury Bill + 50 bps), 1/8/26 (144A) | &nbsp;&nbsp; 3398300 |
| 1,750,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Residential Re, 11.343%, (3 Month U.S. Treasury Bill + 700 bps), 12/6/26 (144A) | &nbsp;&nbsp; 1743350 |
| 750,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sakura Re, 17.843%, (3 Month U.S. Treasury Bill + 1,350 bps), 1/5/26 (144A) | &nbsp;&nbsp; 749925 |
| 2,750,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sanders Re II, 7.433%, (3 Month U.S. Treasury Bill + 309 bps), 4/7/25 (144A) | &nbsp;&nbsp; 2549250 |
| 1,000,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sanders Re III, 10.593%, (3 Month U.S. Treasury Bill + 625 bps), 4/7/27 (144A) | &nbsp;&nbsp; 998500 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp; $16212525 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Multiperil – U.S. & Canada — 0.0%†** |  |
| 250,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Matterhorn Re, 10.023%, (SOFR + 575 bps), 12/8/25 (144A) | $198475 |
| 1,000,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Mona Lisa Re, Ltd., 17.08%, (3 Month U.S. Treasury Bill + 1250 bps), 1/8/26 (144A) | &nbsp;&nbsp; 1000000 |
| 750,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Northshore Re II, 12.343%, (3 Month U.S. Treasury Bill + 800 bps), 7/8/25 (144A) | &nbsp;&nbsp; 712050 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; $1910525 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Multiperil – U.S. Regional — 0.1%** |  |
| 1,000,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Kilimanjaro III Re, 5.25%, (3 Month U.S. Treasury Bill + 525 bps), 6/25/25 (144A) | $897400 |
| 3,500,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Long Point Re IV, 8.593%, (3 Month USD LIBOR + 425 bps), 6/1/26 (144A) | &nbsp;&nbsp; 3316950 |
| 1,250,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Matterhorn Re, 9.343%, (3 Month U.S. Treasury Bill + 500 bps), 1/8/24 (144A) | &nbsp;&nbsp; 1050000 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; $5264350 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2253

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Pandemic – U.S — 0.0%†** |  |
| 1,000,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Vitality Re XI, 6.143%, (3 Month U.S. Treasury Bill + 180 bps), 1/9/24 (144A) | $947500 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Windstorm – Florida — 0.0%†** |  |
| 750,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Integrity Re, 11.343%, (3 Month U.S. Treasury Bill + 700 bps), 6/6/25 (144A) | $637500 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Windstorm - Texas — 0.1%** |  |
| 3,250,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Alamo Re II, 9.863%, (1 Month U.S. Treasury Bill + 552 bps), 6/8/23 (144A) | $3243500 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Windstorm – U.S. — 0.0%†** |  |
| 250,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Bonanza Re, 10.093%, (3 Month U.S. Treasury Bill + 575 bps), 3/16/25 (144A) | $200000 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Windstorm – U.S. Regional — 0.0%†** |  |
| 1,000,000(a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Commonwealth Re, 3.50%, (3 Month U.S. Treasury Bill + 350 bps), 7/8/25 (144A) | $942500 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Event Linked Bonds** | &nbsp;&nbsp;&nbsp;&nbsp; **$39870150** |

---

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Face <br> Amount<br> USD ($)** |  |  |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Collateralized Reinsurance — 0.7%** |  |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Earthquakes – California — 0.0%†** |  |
| 1,006,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Adare Re 2022, 12/31/27 | $1054819 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Multiperil – Massachusetts — 0.1%** |  |
| 1,250,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ailsa Re 2022, 5/31/28 | $1241343 |
| 1,750,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Denning Re 2022, 6/30/28 | &nbsp;&nbsp; 1733561 |
| 500,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Portsalon Re 2022, 5/31/28 | &nbsp;&nbsp; 458460 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; $3433364 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Multiperil – U.S. — 0.3%** |  |
| 8,000,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ballybunion Re 2020, 2/28/23 | $903793 |
| 2,250,000(i)(j) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ballybunion Re 2021-3, 7/31/25 | &nbsp;&nbsp; 100616 |
| 1,750,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ballybunion Re 2022, 12/31/27 | &nbsp;&nbsp; 1780366 |
| 3,000,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ballybunion Re 2022-2, 5/31/28 | &nbsp;&nbsp; 3046530 |
| 4,000,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ballybunion Re 2022-3, 6/30/28 | &nbsp;&nbsp; 4089129 |
| 500,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Port Royal Re 2022, 4/30/28 | &nbsp;&nbsp; 497500 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp; $10417934 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Multiperil – Worldwide — 0.3%** |  |
| 2,000,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Celadon Re 2022, 3/31/28 | $1926256 |
| 5,500,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gamboge Re 2022, 3/31/28 | &nbsp;&nbsp; 5363973 |
| 167,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Limestone Re, 3/1/23 (144A) | &nbsp;&nbsp;&nbsp;&nbsp; — |

---

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

54Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Face <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Multiperil – Worldwide — (continued)** |  |
| 1,420,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Limestone Re 2020-1, 3/1/24 (144A) | $20874 |
| 480,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Limestone Re 2020-1, 3/1/24 (144A) | &nbsp;&nbsp; 7056 |
| 250,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Merion Re 2022-1, 12/31/27 | &nbsp;&nbsp; 253650 |
| 250,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Old Head Re 2022, 12/31/27 | &nbsp;&nbsp; 125000 |
| 1,000,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pine Valley Re 2022, 12/31/27 | &nbsp;&nbsp; 992080 |
| 350,000(i)(j) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Walton Health Re 2019, 6/30/23 | &nbsp;&nbsp; 189933 |
| 2,500,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Walton Health Re 2022, 12/15/27 | &nbsp;&nbsp; 2327387 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp; $11206209 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Windstorm – Florida — 0.0%†** |  |
| 1,500,000(i)(j) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Formby Re 2018, 2/28/23 | $48035 |
| 2,000,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Isosceles Re 2022, 5/31/28 | &nbsp;&nbsp; 1997600 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; $2045635 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Windstorm - North Carolina — 0.0%†** |  |
| 2,000,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Isosceles Re 2022-A, 4/30/28 | $1200 |
| 2,000,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Isosceles Re 2022-A, 4/30/28 | &nbsp;&nbsp; 5200 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; $6400 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Windstorm – U.S. — 0.0%†** |  |
| 500,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Shadow Creek Re 2021, 7/31/25 | $7593 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Windstorm – U.S. Regional — 0.0%†** |  |
| 7,255,240(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Oakmont Re 2020, 4/30/24 | &nbsp;&nbsp;$— |
| 4,500,000(i)(j) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Oakmont Re 2022, 4/1/28 | &nbsp;&nbsp; 1415274 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; $1415274 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Collateralized Reinsurance** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **29587228** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Reinsurance Sidecars — 1.7%** |  |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Multiperil – U.S. — 0.0%** |  |
| 2,000,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Carnoustie Re 2020, 12/31/23 | $271200 |
| 1,853,719(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Carnoustie Re 2021, 12/31/24 | &nbsp;&nbsp; 87866 |
| 1,000,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Carnoustie Re 2022, 12/31/27 | &nbsp;&nbsp; 1059539 |
| 2,000,000(k) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Harambee Re 2018, 12/31/24 | &nbsp;&nbsp;&nbsp;&nbsp; — |
| 5,000,000(k) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Harambee Re 2019, 12/31/24 | &nbsp;&nbsp; 6000 |
| 4,000,000(k) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Harambee Re 2020, 12/31/23 | &nbsp;&nbsp; 59200 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; $1483805 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Multiperil – Worldwide — 1.7%** |  |
| 2,200(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Alturas Re 2019-1, 3/10/23 (144A) | $10061 |
| 34,018(k) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Alturas Re 2019-2, 3/10/23 | &nbsp;&nbsp; 10239 |
| 24,550(k) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Alturas Re 2019-3, 9/12/23 | &nbsp;&nbsp;&nbsp; 304 |
| 285,668(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Alturas Re 2020-1A, 3/10/23 (144A) | &nbsp;&nbsp; 10827 |
| 363,577(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Alturas Re 2020-1B, 3/10/23 (144A) | &nbsp;&nbsp; 13780 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2255

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Face <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Multiperil – Worldwide — (continued)** |  |
| 540,698(k) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Alturas Re 2020-2, 3/10/23 | $78996 |
| 225,450(k) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Alturas Re 2020-3, 9/30/24 | &nbsp;&nbsp;&nbsp;&nbsp; — |
| 3,959,302(k) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Alturas Re 2021-2, 12/31/24 | &nbsp;&nbsp;&nbsp;&nbsp; — |
| 213,682(j)(k) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Alturas Re 2021-3, 7/31/25 | &nbsp;&nbsp; 45792 |
| 3,159,827(k) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Alturas Re 2022-2, 12/31/27 | &nbsp;&nbsp; 2962970 |
| 5,000,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Bantry Re 2019, 12/31/24 | &nbsp;&nbsp; 85091 |
| 5,000,000(i)(j) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Bantry Re 2021, 12/31/24 | &nbsp;&nbsp; 446963 |
| 4,171,573(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Bantry Re 2022, 12/31/27 | &nbsp;&nbsp; 4349625 |
| 10,192,268(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Berwick Re 2018-1, 12/31/24 | &nbsp;&nbsp; 787862 |
| 7,281,734(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Berwick Re 2019-1, 12/31/24 | &nbsp;&nbsp; 1161437 |
| 3,000,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Berwick Re 2020-1, 12/31/23 | &nbsp;&nbsp;&nbsp; 300 |
| 4,500,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Berwick Re 2022, 12/31/27 | &nbsp;&nbsp; 4506300 |
| 59,061(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Eden Re II, 3/22/23 (144A) | &nbsp;&nbsp; 49824 |
| 6,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Eden Re II, 3/22/23 (144A) | &nbsp;&nbsp; 4221 |
| 640,000(i)(j) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Eden Re II, 3/22/24 (144A) | &nbsp;&nbsp; 247040 |
| 210,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Eden Re II, 3/22/24 (144A) | &nbsp;&nbsp; 98700 |
| 790,856(i)(j) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Eden Re II, 3/21/25 (144A) | &nbsp;&nbsp; 449206 |
| 5,200,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Eden Re II, 3/20/26 (144A) | &nbsp;&nbsp; 4837040 |
| 1,000,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gleneagles Re 2018, 12/31/24 | &nbsp;&nbsp; 118300 |
| 1,250,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gleneagles Re 2021, 12/31/24 | &nbsp;&nbsp; 277857 |
| 1,250,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gleneagles Re 2022, 12/31/27 | &nbsp;&nbsp; 1289063 |
| 2,118,314(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gullane Re 2018, 12/31/24 | &nbsp;&nbsp; 131133 |
| 6,000,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gullane Re 2022, 12/31/27 | &nbsp;&nbsp; 6381951 |
| 500,000(k) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Lion Rock Re 2019, 1/31/23 | &nbsp;&nbsp;&nbsp;&nbsp; — |
| 500,000(k) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Lion Rock Re 2020, 1/31/23 | &nbsp;&nbsp;&nbsp;&nbsp; — |
| 500,000(j)(k) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Lion Rock Re 2021, 12/31/24 | &nbsp;&nbsp; 104650 |
| 2,993,180(j)(k) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Lorenz Re 2019, 6/30/23 | &nbsp;&nbsp; 5388 |
| 7,000,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Merion Re 2018-2, 12/31/24 | &nbsp;&nbsp; 1059800 |
| 9,000,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Merion Re 2021-2, 12/31/24 | &nbsp;&nbsp; 1768500 |
| 6,551,154(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Merion Re 2022-2, 12/31/27 | &nbsp;&nbsp; 6211225 |
| 3,800,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pangaea Re 2018-1, 12/31/24 | &nbsp;&nbsp; 80007 |
| 4,017,011(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pangaea Re 2019-1, 2/1/23 | &nbsp;&nbsp; 83704 |
| 4,779,537(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pangaea Re 2019-3, 7/1/23 | &nbsp;&nbsp; 171924 |
| 4,727,246(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pangaea Re 2022-1, 12/31/27 | &nbsp;&nbsp; 5052150 |
| 2,750,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pangaea Re 2022-3, 5/31/28 | &nbsp;&nbsp; 2822314 |
| 1,250,000(i)(j) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Phoenix One Re, 1/4/27 (144A) | &nbsp;&nbsp; 1415125 |
| 2,000,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;RosaPenna Re 2022, 6/30/28 | &nbsp;&nbsp; 2023249 |
| 600,000(i)(j) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sector Re V, 3/1/24 (144A) | &nbsp;&nbsp; 289640 |
| 1,914(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sector Re V, 3/1/24 (144A) | &nbsp;&nbsp; 48793 |
| 99,999(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sector Re V, 12/1/24 (144A) | &nbsp;&nbsp; 166869 |
| 200,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sector Re V, 12/1/24 (144A) | &nbsp;&nbsp; 333741 |

---

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

56Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Face <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Multiperil – Worldwide — (continued)** |  |
| 3,490(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sector Re V, 3/1/25 (144A) | $25078 |
| 3,326(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sector Re V, 12/1/25 (144A) | &nbsp;&nbsp;&nbsp;&nbsp; — |
| 5,986(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sector Re V, 12/1/25 (144A) | &nbsp;&nbsp;&nbsp;&nbsp; — |
| 10,000(a)(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sector Re V, 12/1/26 (144A) | &nbsp;&nbsp; 10694 |
| 84,000(a)(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sector Re V, 12/1/26 (144A) | &nbsp;&nbsp; 89833 |
| 4,605,987 + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sector Re V, 12/1/27 (144A) | &nbsp;&nbsp; 4605987 |
| 3,609,700(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sussex Re 2020-1, 12/31/24 | &nbsp;&nbsp; 5415 |
| 1,250,000(i)(j) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sussex Re 2021-1, 12/31/24 | &nbsp;&nbsp; 113500 |
| 3,000,000(k) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Thopas Re 2019, 12/31/24 | &nbsp;&nbsp; 5100 |
| 6,000,000(k) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Thopas Re 2020, 12/31/23 | &nbsp;&nbsp;&nbsp;&nbsp; — |
| 7,000,000(k) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Thopas Re 2021, 12/31/24 | &nbsp;&nbsp; 112700 |
| 4,000,000(k) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Thopas Re 2022, 12/31/27 | &nbsp;&nbsp; 4322800 |
| 4,228,426(j)(k) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Torricelli Re 2021, 7/31/25 | &nbsp;&nbsp; 237638 |
| 4,500,000(k) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Torricelli Re 2022, 6/30/28 | &nbsp;&nbsp; 4462200 |
| 2,000,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Versutus Re 2018, 12/31/24 | &nbsp;&nbsp; 3200 |
| 1,765,095(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Versutus Re 2019-A, 12/31/24 | &nbsp;&nbsp;&nbsp;&nbsp; — |
| 1,734,905(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Versutus Re 2019-B, 12/31/24 | &nbsp;&nbsp;&nbsp;&nbsp; — |
| 1,000,000(j)(k) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Viribus Re 2018, 12/31/24 | &nbsp;&nbsp;&nbsp;&nbsp; — |
| 3,650,000(k) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Viribus Re 2019, 12/31/24 | &nbsp;&nbsp; 25915 |
| 4,139,570(k) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Viribus Re 2020, 12/31/23 | &nbsp;&nbsp; 182141 |
| 3,000,000(k) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Viribus Re 2022, 12/31/27 | &nbsp;&nbsp; 3060000 |
| 1,623,326(i)(j) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Woburn Re 2018, 12/31/24 | &nbsp;&nbsp; 51702 |
| 4,979,452(i)(j) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Woburn Re 2019, 12/31/24 | &nbsp;&nbsp; 946702 |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp; $68252566 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Reinsurance Sidecars** | &nbsp;&nbsp;&nbsp;&nbsp; **$** **69736371** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Industry Loss Warranties — 0.1%** |  |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Earthquakes - U.S. — 0.1%** |  |
| 3,000,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Vermillion Re 2022, 12/31/27 | $3042600 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Windstorm – U.S. — 0.0%†** |  |
| 2,000,000(i) + | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ballylifin Re 2022, 5/31/28 | $9200 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Industry Loss Warranties** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **$** **3051800** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Insurance-Linked Securities<br> (Cost $145,564,787)** | &nbsp;&nbsp; **$** **142245549** |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2257

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency<br> Obligations — 41.1% of Net Assets** |  |
| 13715174 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 1.500%, 12/1/41 | $11218893 |
| 2900492 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 1.500%, 1/1/42 | &nbsp;&nbsp; 2343885 |
| 2263302 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 1.500%, 1/1/42 | &nbsp;&nbsp; 1828968 |
| 14742236 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 1.500%, 1/1/42 | &nbsp;&nbsp; 11912994 |
| 7579057 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 1.500%, 2/1/42 | &nbsp;&nbsp; 6124630 |
| 10542695 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 1.500%, 2/1/42 | &nbsp;&nbsp; 8519507 |
| 1495709 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 1.500%, 3/1/42 | &nbsp;&nbsp; 1208671 |
| 348343 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 2.000%, 2/1/42 | &nbsp;&nbsp; 291669 |
| 3827807 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 2.000%, 11/1/51 | &nbsp;&nbsp; 3116629 |
| 5811117 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 2.000%, 3/1/52 | &nbsp;&nbsp; 4734543 |
| 3886105 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 2.000%, 3/1/52 | &nbsp;&nbsp; 3166465 |
| 34492664 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 2.500%, 5/1/51 | &nbsp;&nbsp; 29292031 |
| 4060391 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 2.500%, 8/1/51 | &nbsp;&nbsp; 3446896 |
| 4360284 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 2.500%, 4/1/52 | &nbsp;&nbsp; 3692529 |
| 19299721 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 2.500%, 6/1/52 | &nbsp;&nbsp; 16344191 |
| 5997035 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 2.500%, 8/1/52 | &nbsp;&nbsp; 5080163 |
| 5841321 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 2.500%, 9/1/52 | &nbsp;&nbsp; 4947651 |
| 2014602 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 2.500%, 9/1/52 | &nbsp;&nbsp; 1706599 |
| 637191 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.000%, 10/1/29 | &nbsp;&nbsp; 613417 |
| 509562 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.000%, 9/1/42 | &nbsp;&nbsp; 464197 |
| 2672052 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.000%, 11/1/42 | &nbsp;&nbsp; 2434132 |
| 383519 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.000%, 2/1/43 | &nbsp;&nbsp; 349359 |
| 890559 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.000%, 2/1/43 | &nbsp;&nbsp; 811255 |
| 2374005 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.000%, 6/1/46 | &nbsp;&nbsp; 2130880 |
| 629952 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.000%, 12/1/46 | &nbsp;&nbsp; 564852 |
| 46586 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.000%, 10/1/48 | &nbsp;&nbsp; 41342 |
| 44878617 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.000%, 4/1/52 | &nbsp;&nbsp; 39385618 |
| 367851 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 4/1/42 | &nbsp;&nbsp; 343843 |
| 976670 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 8/1/43 | &nbsp;&nbsp; 914345 |
| 166699 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 9/1/44 | &nbsp;&nbsp; 155767 |
| 2370878 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 6/1/45 | &nbsp;&nbsp; 2211453 |
| 107702 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 7/1/45 | &nbsp;&nbsp; 100543 |
| 2067464 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 10/1/45 | &nbsp;&nbsp; 1926728 |

---

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

58Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 2098760 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 11/1/45 | $1953058 |
| 2413634 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 7/1/46 | &nbsp;&nbsp; 2279182 |
| 3793010 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 8/1/46 | &nbsp;&nbsp; 3552548 |
| 3125018 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 8/1/46 | &nbsp;&nbsp; 2907176 |
| 2786131 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 8/1/46 | &nbsp;&nbsp; 2590753 |
| 4240480 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 12/1/46 | &nbsp;&nbsp; 3940920 |
| 493928 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 1/1/47 | &nbsp;&nbsp; 459026 |
| 238290 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 6/1/47 | &nbsp;&nbsp; 221227 |
| 52440 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 1/1/52 | &nbsp;&nbsp; 47750 |
| 256390 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 1/1/52 | &nbsp;&nbsp; 233824 |
| 273382 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 3/1/52 | &nbsp;&nbsp; 248526 |
| 291339 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 3/1/52 | &nbsp;&nbsp; 266618 |
| 3867502 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 4/1/52 | &nbsp;&nbsp; 3536288 |
| 2922509 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 4/1/52 | &nbsp;&nbsp; 2657461 |
| 1169925 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 4/1/52 | &nbsp;&nbsp; 1063722 |
| 311111 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 4/1/52 | &nbsp;&nbsp; 282736 |
| 488923 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 4/1/52 | &nbsp;&nbsp; 444332 |
| 692225 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 4/1/52 | &nbsp;&nbsp; 629662 |
| 348032 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 4/1/52 | &nbsp;&nbsp; 316399 |
| 353376 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 4/1/52 | &nbsp;&nbsp; 321331 |
| 264166 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 4/1/52 | &nbsp;&nbsp; 240233 |
| 267990 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 4/1/52 | &nbsp;&nbsp; 244294 |
| 586499 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 4/1/52 | &nbsp;&nbsp; 534533 |
| 3442874 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 3.500%, 4/1/52 | &nbsp;&nbsp; 3157038 |
| 3725312 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 11/1/41 | &nbsp;&nbsp; 3642616 |
| 63446 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 6/1/42 | &nbsp;&nbsp; 60932 |
| 27260 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 7/1/42 | &nbsp;&nbsp; 26208 |
| 1245013 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 10/1/42 | &nbsp;&nbsp; 1196965 |
| 16507 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 11/1/42 | &nbsp;&nbsp; 15828 |
| 207861 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 5/1/46 | &nbsp;&nbsp; 199192 |
| 52355 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 5/1/46 | &nbsp;&nbsp; 50248 |
| 1059615 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 6/1/46 | &nbsp;&nbsp; 1014985 |
| 1020793 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 7/1/46 | &nbsp;&nbsp; 978853 |
| 934839 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 8/1/46 | &nbsp;&nbsp; 894882 |
| 51489 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 10/1/46 | &nbsp;&nbsp; 49352 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2259

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 316455 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 3/1/47 | $302522 |
| 1212996 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 4/1/47 | &nbsp;&nbsp; 1158270 |
| 1627543 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 4/1/47 | &nbsp;&nbsp; 1555208 |
| 1708336 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 4/1/47 | &nbsp;&nbsp; 1634978 |
| 748333 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 4/1/47 | &nbsp;&nbsp; 715501 |
| 439271 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 4/1/47 | &nbsp;&nbsp; 420135 |
| 1219089 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 5/1/47 | &nbsp;&nbsp; 1165599 |
| 258082 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 6/1/47 | &nbsp;&nbsp; 246637 |
| 380748 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 7/1/47 | &nbsp;&nbsp; 364381 |
| 1179393 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 10/1/47 | &nbsp;&nbsp; 1124903 |
| 714838 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 12/1/48 | &nbsp;&nbsp; 680898 |
| 1094469 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 12/1/48 | &nbsp;&nbsp; 1040845 |
| 213164 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 5/1/50 | &nbsp;&nbsp; 201922 |
| 393139 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 6/1/50 | &nbsp;&nbsp; 371371 |
| 242018 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 8/1/50 | &nbsp;&nbsp; 228565 |
| 195495 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 10/1/50 | &nbsp;&nbsp; 186779 |
| 367168 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 2/1/51 | &nbsp;&nbsp; 345754 |
| 204704 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 4/1/51 | &nbsp;&nbsp; 192488 |
| 184241 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 9/1/51 | &nbsp;&nbsp; 172940 |
| 1129738 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 9/1/51 | &nbsp;&nbsp; 1060937 |
| 2455112 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 10/1/51 | &nbsp;&nbsp; 2303939 |
| 378866 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 10/1/51 | &nbsp;&nbsp; 355823 |
| 3645818 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 6/1/52 | &nbsp;&nbsp; 3420339 |
| 196417 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.000%, 6/1/52 | &nbsp;&nbsp; 184308 |
| 677192 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.500%, 11/1/40 | &nbsp;&nbsp; 670130 |
| 427407 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.500%, 3/1/42 | &nbsp;&nbsp; 424182 |
| 44260 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 4.500%, 11/1/43 | &nbsp;&nbsp; 43529 |
| 3379 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 5.000%, 11/1/34 | &nbsp;&nbsp; 3455 |
| 46157 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 5.000%, 6/1/35 | &nbsp;&nbsp; 46101 |
| 100785 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 5.000%, 9/1/38 | &nbsp;&nbsp; 102856 |
| 97378 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 5.000%, 10/1/38 | &nbsp;&nbsp; 99379 |
| 822 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 5.000%, 5/1/39 | &nbsp;&nbsp;&nbsp; 831 |

---

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

60Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 2074 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 5.000%, 12/1/39 | $2091 |
| 770843 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 5.000%, 9/1/49 | &nbsp;&nbsp; 770076 |
| 2043541 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 5.000%, 10/1/49 | &nbsp;&nbsp; 2047293 |
| 348489 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 5.000%, 10/1/49 | &nbsp;&nbsp; 344905 |
| 3176262 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 5.000%, 12/1/49 | &nbsp;&nbsp; 3162475 |
| 1879832 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 5.000%, 12/1/50 | &nbsp;&nbsp; 1869936 |
| 63322 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 5.500%, 9/1/33 | &nbsp;&nbsp; 65350 |
| 3236 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 5.500%, 1/1/34 | &nbsp;&nbsp; 3331 |
| 31629 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 5.500%, 11/1/34 | &nbsp;&nbsp; 32717 |
| 3352 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 5.500%, 11/1/34 | &nbsp;&nbsp; 3365 |
| 46792 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 5.500%, 8/1/35 | &nbsp;&nbsp; 47393 |
| 11106 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 5.500%, 11/1/35 | &nbsp;&nbsp; 11409 |
| 308783 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 5.500%, 6/1/41 | &nbsp;&nbsp; 320533 |
| 32714 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.000%, 1/1/33 | &nbsp;&nbsp; 33398 |
| 11720 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.000%, 1/1/33 | &nbsp;&nbsp; 11941 |
| 13944 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.000%, 2/1/33 | &nbsp;&nbsp; 14435 |
| 1337 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.000%, 2/1/33 | &nbsp;&nbsp; 1360 |
| 43209 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.000%, 3/1/33 | &nbsp;&nbsp; 44734 |
| 7550 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.000%, 3/1/33 | &nbsp;&nbsp; 7671 |
| 35742 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.000%, 9/1/33 | &nbsp;&nbsp; 37004 |
| 17759 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.000%, 11/1/33 | &nbsp;&nbsp; 18130 |
| 4568 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.000%, 11/1/33 | &nbsp;&nbsp; 4691 |
| 31454 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.000%, 12/1/33 | &nbsp;&nbsp; 32049 |
| 6872 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.000%, 12/1/33 | &nbsp;&nbsp; 6983 |
| 27468 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.000%, 1/1/34 | &nbsp;&nbsp; 28019 |
| 10047 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.000%, 1/1/34 | &nbsp;&nbsp; 10402 |
| 131011 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.000%, 5/1/34 | &nbsp;&nbsp; 135633 |
| 17471 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.000%, 5/1/34 | &nbsp;&nbsp; 17752 |
| 12354 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.000%, 4/1/35 | &nbsp;&nbsp; 12553 |
| 37966 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.000%, 6/1/35 | &nbsp;&nbsp; 38586 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2261

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 40840 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.000%, 4/1/36 | $41551 |
| 25885 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.000%, 7/1/36 | &nbsp;&nbsp; 26310 |
| 3362 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.000%, 7/1/36 | &nbsp;&nbsp; 3511 |
| 8582 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.000%, 12/1/36 | &nbsp;&nbsp; 8784 |
| 21793 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.000%, 1/1/38 | &nbsp;&nbsp; 22653 |
| 22180 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.000%, 7/1/38 | &nbsp;&nbsp; 22558 |
| 153 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.500%, 11/1/30 | &nbsp;&nbsp;&nbsp; 157 |
| 130 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.500%, 3/1/31 | &nbsp;&nbsp;&nbsp; 133 |
| 911 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.500%, 3/1/31 | &nbsp;&nbsp;&nbsp; 936 |
| 2217 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.500%, 5/1/31 | &nbsp;&nbsp; 2307 |
| 3653 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.500%, 5/1/31 | &nbsp;&nbsp; 3747 |
| 220 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.500%, 8/1/31 | &nbsp;&nbsp;&nbsp; 226 |
| 2762 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.500%, 8/1/31 | &nbsp;&nbsp; 2833 |
| 3740 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.500%, 7/1/32 | &nbsp;&nbsp; 3875 |
| 37 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.500%, 1/1/33 | &nbsp;&nbsp;&nbsp; 38 |
| 12109 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 6.500%, 10/1/33 | &nbsp;&nbsp; 12618 |
| 1125 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal Home Loan Mortgage Corp., 7.000%, 11/1/30 | &nbsp;&nbsp; 1166 |
| 137340 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 1.500%, 3/1/41 | &nbsp;&nbsp; 112358 |
| 37204647 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 1.500%, 11/1/41 | &nbsp;&nbsp; 30436015 |
| 1240885 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 1.500%, 1/1/42 | &nbsp;&nbsp; 1002842 |
| 19050818 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 1.500%, 1/1/42 | &nbsp;&nbsp; 15584766 |
| 12611030 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 1.500%, 1/1/42 | &nbsp;&nbsp; 10191828 |
| 15664288 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 1.500%, 2/1/42 | &nbsp;&nbsp; 12659306 |
| 4238747 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 1.500%, 3/1/42 | &nbsp;&nbsp; 3394107 |
| 21228754 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.000%, 12/1/41 | &nbsp;&nbsp; 17894601 |
| 1078264 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.000%, 2/1/42 | &nbsp;&nbsp; 902817 |
| 380066 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.000%, 2/1/42 | &nbsp;&nbsp; 318222 |

---

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

62Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 1014712 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.000%, 11/1/50 | $839410 |
| 636057 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.000%, 1/1/51 | &nbsp;&nbsp; 528544 |
| 11020277 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.000%, 11/1/51 | &nbsp;&nbsp; 9092340 |
| 4083512 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.000%, 2/1/52 | &nbsp;&nbsp; 3326996 |
| 2772343 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.000%, 2/1/52 | &nbsp;&nbsp; 2258952 |
| 7375090 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.000%, 3/1/52 | &nbsp;&nbsp; 6004785 |
| 11563266 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.000%, 3/1/52 | &nbsp;&nbsp; 9422931 |
| 63500000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.000%, 1/1/53 (TBA) | &nbsp;&nbsp; 51654727 |
| 439258 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 7/1/30 | &nbsp;&nbsp; 411831 |
| 387464 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 7/1/30 | &nbsp;&nbsp; 363298 |
| 667274 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 7/1/30 | &nbsp;&nbsp; 625681 |
| 106026 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 12/1/42 | &nbsp;&nbsp; 91403 |
| 98341 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 12/1/42 | &nbsp;&nbsp; 84780 |
| 99873 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 1/1/43 | &nbsp;&nbsp; 86114 |
| 1100546 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 2/1/43 | &nbsp;&nbsp; 948775 |
| 41145 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 2/1/43 | &nbsp;&nbsp; 35167 |
| 39429 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 2/1/43 | &nbsp;&nbsp; 33437 |
| 127669 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 3/1/43 | &nbsp;&nbsp; 110077 |
| 75106 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 4/1/43 | &nbsp;&nbsp; 63705 |
| 112852 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 8/1/43 | &nbsp;&nbsp; 97307 |
| 70441 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 12/1/43 | &nbsp;&nbsp; 60739 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2263

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 101557 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 3/1/44 | $87263 |
| 641439 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 4/1/45 | &nbsp;&nbsp; 553047 |
| 628897 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 4/1/45 | &nbsp;&nbsp; 542227 |
| 216288 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 4/1/45 | &nbsp;&nbsp; 186475 |
| 116002 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 4/1/45 | &nbsp;&nbsp; 100015 |
| 185773 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 4/1/45 | &nbsp;&nbsp; 160167 |
| 247686 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 4/1/45 | &nbsp;&nbsp; 213554 |
| 64879 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 4/1/45 | &nbsp;&nbsp; 55938 |
| 100924 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 4/1/45 | &nbsp;&nbsp; 87012 |
| 21234 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 5/1/45 | &nbsp;&nbsp; 18308 |
| 51861 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 7/1/45 | &nbsp;&nbsp; 44715 |
| 51425 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 8/1/45 | &nbsp;&nbsp; 44338 |
| 39804 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 1/1/46 | &nbsp;&nbsp; 34317 |
| 568052 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 9/1/50 | &nbsp;&nbsp; 490762 |
| 3001518 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 9/1/50 | &nbsp;&nbsp; 2577651 |
| 635552 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 9/1/50 | &nbsp;&nbsp; 550713 |
| 307954 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 10/1/50 | &nbsp;&nbsp; 265658 |
| 38474451 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 5/1/51 | &nbsp;&nbsp; 33096816 |
| 17153677 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 10/1/51 | &nbsp;&nbsp; 14565401 |
| 10056148 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 11/1/51 | &nbsp;&nbsp; 8647454 |
| 10908719 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 12/1/51 | &nbsp;&nbsp; 9299303 |

---

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

64Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 23020353 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 1/1/52 | $19625953 |
| 1886163 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 2/1/52 | &nbsp;&nbsp; 1618256 |
| 27072147 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 4/1/52 | &nbsp;&nbsp; 22934253 |
| 4267090 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 4/1/52 | &nbsp;&nbsp; 3644509 |
| 3941371 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 4/1/52 | &nbsp;&nbsp; 3337564 |
| 25883735 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 4/1/52 | &nbsp;&nbsp; 21919847 |
| 3921293 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 5/1/52 | &nbsp;&nbsp; 3321057 |
| 6706559 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 6/1/52 | &nbsp;&nbsp; 5681800 |
| 12850915 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 7/1/52 | &nbsp;&nbsp; 10887657 |
| 5038825 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 8/1/52 | &nbsp;&nbsp; 4268089 |
| 5875133 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 10/1/52 | &nbsp;&nbsp; 4976782 |
| 78700000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 2.500%, 1/1/53 (TBA) | &nbsp;&nbsp; 66620676 |
| 1133047 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.000%, 10/1/30 | &nbsp;&nbsp; 1083829 |
| 418732 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.000%, 4/1/31 | &nbsp;&nbsp; 400532 |
| 173885 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.000%, 6/1/40 | &nbsp;&nbsp; 157861 |
| 1860568 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.000%, 9/1/42 | &nbsp;&nbsp; 1693103 |
| 319996 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.000%, 3/1/45 | &nbsp;&nbsp; 289664 |
| 1968195 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.000%, 4/1/47 | &nbsp;&nbsp; 1762808 |
| 15870684 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.000%, 1/1/52 | &nbsp;&nbsp; 14106558 |
| 21351335 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.000%, 3/1/52 | &nbsp;&nbsp; 19033861 |
| 7940888 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.000%, 3/1/52 | &nbsp;&nbsp; 6968235 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2265

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 7200000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.000%, 1/1/53 (TBA) | $6317059 |
| 5646117 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.000%, 2/1/57 | &nbsp;&nbsp; 4977479 |
| 891857 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 6/1/28 | &nbsp;&nbsp; 875314 |
| 290788 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 11/1/40 | &nbsp;&nbsp; 272126 |
| 241902 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 10/1/41 | &nbsp;&nbsp; 226433 |
| 1516748 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 11/1/41 | &nbsp;&nbsp; 1442421 |
| 182979 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 6/1/42 | &nbsp;&nbsp; 171278 |
| 760108 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 7/1/42 | &nbsp;&nbsp; 711505 |
| 852448 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 8/1/42 | &nbsp;&nbsp; 797972 |
| 106298 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 10/1/42 | &nbsp;&nbsp; 100448 |
| 99828 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 11/1/42 | &nbsp;&nbsp; 93380 |
| 193908 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 12/1/42 | &nbsp;&nbsp; 181513 |
| 180549 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 12/1/42 | &nbsp;&nbsp; 169004 |
| 508044 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 4/1/45 | &nbsp;&nbsp; 473043 |
| 1633143 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 6/1/45 | &nbsp;&nbsp; 1520306 |
| 3502052 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 8/1/45 | &nbsp;&nbsp; 3280127 |
| 3344808 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 9/1/45 | &nbsp;&nbsp; 3109020 |
| 1310635 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 9/1/45 | &nbsp;&nbsp; 1219267 |
| 420315 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 10/1/45 | &nbsp;&nbsp; 391014 |
| 5042024 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 11/1/45 | &nbsp;&nbsp; 4722504 |
| 1238953 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 5/1/46 | &nbsp;&nbsp; 1150397 |

---

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

66Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 153450 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 10/1/46 | $142371 |
| 3379564 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 1/1/47 | &nbsp;&nbsp; 3135899 |
| 2656585 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 1/1/47 | &nbsp;&nbsp; 2466123 |
| 1234566 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 1/1/47 | &nbsp;&nbsp; 1144781 |
| 33962 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 2/1/47 | &nbsp;&nbsp; 31543 |
| 80803 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 7/1/47 | &nbsp;&nbsp; 75474 |
| 79549 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 10/1/47 | &nbsp;&nbsp; 73964 |
| 250429 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 12/1/47 | &nbsp;&nbsp; 234905 |
| 2488615 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 12/1/47 | &nbsp;&nbsp; 2306598 |
| 28876 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 2/1/49 | &nbsp;&nbsp; 26270 |
| 33200 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 4/1/49 | &nbsp;&nbsp; 30208 |
| 756666 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 5/1/49 | &nbsp;&nbsp; 707171 |
| 1139572 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 5/1/49 | &nbsp;&nbsp; 1067406 |
| 30063 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 7/1/49 | &nbsp;&nbsp; 27946 |
| 926077 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 8/1/51 | &nbsp;&nbsp; 844370 |
| 1301952 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 9/1/51 | &nbsp;&nbsp; 1186525 |
| 124170 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 9/1/51 | &nbsp;&nbsp; 112892 |
| 221149 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 12/1/51 | &nbsp;&nbsp; 201181 |
| 246559 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 2/1/52 | &nbsp;&nbsp; 224226 |
| 707086 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 2/1/52 | &nbsp;&nbsp; 643069 |
| 280751 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 2/1/52 | &nbsp;&nbsp; 259686 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2267

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 272481 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 3/1/52 | $247824 |
| 273192 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 3/1/52 | &nbsp;&nbsp; 250739 |
| 467329 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 3/1/52 | &nbsp;&nbsp; 429716 |
| 1316768 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 3/1/52 | &nbsp;&nbsp; 1198161 |
| 1678210 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 4/1/52 | &nbsp;&nbsp; 1526197 |
| 1007489 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 4/1/52 | &nbsp;&nbsp; 915837 |
| 1499655 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 4/1/52 | &nbsp;&nbsp; 1363803 |
| 3478950 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 4/1/52 | &nbsp;&nbsp; 3162385 |
| 9081213 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 4/1/52 | &nbsp;&nbsp; 8277644 |
| 1810544 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 4/1/52 | &nbsp;&nbsp; 1646715 |
| 574650 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 4/1/52 | &nbsp;&nbsp; 522236 |
| 305413 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 4/1/52 | &nbsp;&nbsp; 277559 |
| 485254 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 4/1/52 | &nbsp;&nbsp; 442255 |
| 561194 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 4/1/52 | &nbsp;&nbsp; 510413 |
| 2403470 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 4/1/52 | &nbsp;&nbsp; 2203919 |
| 6312214 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 5/1/52 | &nbsp;&nbsp; 5770845 |
| 492185 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 6/1/52 | &nbsp;&nbsp; 449973 |
| 23031623 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 6/1/52 | &nbsp;&nbsp; 20945188 |
| 6166536 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 6/1/52 | &nbsp;&nbsp; 5607883 |
| 355178 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 3.500%, 8/1/58 | &nbsp;&nbsp; 325840 |
| 2341 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 10/1/25 | &nbsp;&nbsp; 2285 |

---

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

68Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 76295 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 11/1/34 | $73466 |
| 8000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 1/15/38 (TBA) | &nbsp;&nbsp; 7797167 |
| 677694 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 4/1/39 | &nbsp;&nbsp; 650845 |
| 2667430 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 10/1/40 | &nbsp;&nbsp; 2605335 |
| 458335 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 12/1/40 | &nbsp;&nbsp; 447665 |
| 342341 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 4/1/41 | &nbsp;&nbsp; 328769 |
| 350329 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 5/1/41 | &nbsp;&nbsp; 336441 |
| 327103 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 10/1/41 | &nbsp;&nbsp; 314135 |
| 233035 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 12/1/41 | &nbsp;&nbsp; 223796 |
| 694902 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 1/1/42 | &nbsp;&nbsp; 667342 |
| 97194 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 1/1/42 | &nbsp;&nbsp; 93338 |
| 565752 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 2/1/42 | &nbsp;&nbsp; 543315 |
| 1927650 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 2/1/42 | &nbsp;&nbsp; 1851180 |
| 726276 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 4/1/42 | &nbsp;&nbsp; 697480 |
| 168679 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 4/1/42 | &nbsp;&nbsp; 161988 |
| 1114728 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 5/1/42 | &nbsp;&nbsp; 1070503 |
| 82620 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 6/1/42 | &nbsp;&nbsp; 79344 |
| 30961 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 6/1/42 | &nbsp;&nbsp; 29836 |
| 89821 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 7/1/42 | &nbsp;&nbsp; 86557 |
| 1901144 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 8/1/42 | &nbsp;&nbsp; 1834414 |
| 412035 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 10/1/42 | &nbsp;&nbsp; 395694 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2269

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 176318 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 10/1/42 | $169895 |
| 1113970 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 11/1/43 | &nbsp;&nbsp; 1073372 |
| 23234 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 1/1/44 | &nbsp;&nbsp; 22255 |
| 39406 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 6/1/45 | &nbsp;&nbsp; 38105 |
| 197699 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 7/1/45 | &nbsp;&nbsp; 189366 |
| 154026 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 4/1/46 | &nbsp;&nbsp; 147500 |
| 949503 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 7/1/46 | &nbsp;&nbsp; 908492 |
| 1316499 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 7/1/46 | &nbsp;&nbsp; 1260995 |
| 805320 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 8/1/46 | &nbsp;&nbsp; 770370 |
| 900474 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 8/1/46 | &nbsp;&nbsp; 861394 |
| 442736 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 11/1/46 | &nbsp;&nbsp; 423978 |
| 1015652 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 4/1/47 | &nbsp;&nbsp; 970734 |
| 982886 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 4/1/47 | &nbsp;&nbsp; 939823 |
| 495056 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 6/1/47 | &nbsp;&nbsp; 472880 |
| 207515 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 6/1/47 | &nbsp;&nbsp; 198840 |
| 423289 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 6/1/47 | &nbsp;&nbsp; 405445 |
| 651236 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 6/1/47 | &nbsp;&nbsp; 622165 |
| 305732 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 7/1/47 | &nbsp;&nbsp; 291895 |
| 775022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 7/1/47 | &nbsp;&nbsp; 739945 |
| 1049817 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 12/1/47 | &nbsp;&nbsp; 1001811 |
| 231280 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 11/1/48 | &nbsp;&nbsp; 221149 |

---

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

70Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 15017 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 3/1/49 | $14245 |
| 14103 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 3/1/49 | &nbsp;&nbsp; 13430 |
| 105094 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 6/1/49 | &nbsp;&nbsp; 101802 |
| 29656 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 9/1/49 | &nbsp;&nbsp; 28278 |
| 81268 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 5/1/50 | &nbsp;&nbsp; 76856 |
| 347590 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 7/1/50 | &nbsp;&nbsp; 327467 |
| 67931 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 10/1/50 | &nbsp;&nbsp; 64107 |
| 225983 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 11/1/50 | &nbsp;&nbsp; 212929 |
| 1910805 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 11/1/50 | &nbsp;&nbsp; 1801759 |
| 878296 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 12/1/50 | &nbsp;&nbsp; 826685 |
| 86482 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 1/1/51 | &nbsp;&nbsp; 81586 |
| 22492 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 1/1/51 | &nbsp;&nbsp; 21247 |
| 412815 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 1/1/51 | &nbsp;&nbsp; 388179 |
| 200190 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 2/1/51 | &nbsp;&nbsp; 188944 |
| 574319 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 2/1/51 | &nbsp;&nbsp; 540591 |
| 666059 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 4/1/51 | &nbsp;&nbsp; 626944 |
| 64525 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 5/1/51 | &nbsp;&nbsp; 60846 |
| 9810 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 6/1/51 | &nbsp;&nbsp; 9231 |
| 1507169 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 6/1/51 | &nbsp;&nbsp; 1416363 |
| 317302 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 7/1/51 | &nbsp;&nbsp; 300385 |
| 1684424 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 7/1/51 | &nbsp;&nbsp; 1584233 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2271

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 3911160 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 7/1/51 | $3673606 |
| 212169 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 8/1/51 | &nbsp;&nbsp; 199969 |
| 5320364 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 8/1/51 | &nbsp;&nbsp; 4995814 |
| 149363 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 9/1/51 | &nbsp;&nbsp; 140365 |
| 78906 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 10/1/51 | &nbsp;&nbsp; 74115 |
| 174656 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 6/1/52 | &nbsp;&nbsp; 163845 |
| 304444 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 6/1/52 | &nbsp;&nbsp; 285674 |
| 781792 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 7/1/56 | &nbsp;&nbsp; 748800 |
| 1144611 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.000%, 1/1/57 | &nbsp;&nbsp; 1096310 |
| 43716 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.500%, 10/1/35 | &nbsp;&nbsp; 43108 |
| 17000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.500%, 1/1/38 (TBA) | &nbsp;&nbsp; 16883985 |
| 112653 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.500%, 8/1/40 | &nbsp;&nbsp; 111633 |
| 435367 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.500%, 11/1/40 | &nbsp;&nbsp; 430342 |
| 115004 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.500%, 2/1/41 | &nbsp;&nbsp; 113677 |
| 423369 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.500%, 4/1/41 | &nbsp;&nbsp; 419698 |
| 20531 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.500%, 5/1/41 | &nbsp;&nbsp; 20353 |
| 782834 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.500%, 5/1/41 | &nbsp;&nbsp; 773797 |
| 1064395 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.500%, 5/1/41 | &nbsp;&nbsp; 1055160 |
| 341691 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.500%, 7/1/41 | &nbsp;&nbsp; 335784 |
| 1297910 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.500%, 1/1/42 | &nbsp;&nbsp; 1286657 |
| 1134596 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.500%, 1/1/42 | &nbsp;&nbsp; 1124758 |

---

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

72Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 137171 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.500%, 3/1/43 | $135981 |
| 5045938 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.500%, 9/1/43 | &nbsp;&nbsp; 5000263 |
| 3344315 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.500%, 1/1/44 | &nbsp;&nbsp; 3315330 |
| 1693059 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.500%, 3/1/44 | &nbsp;&nbsp; 1677148 |
| 14460941 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.500%, 7/1/44 | &nbsp;&nbsp; 14301608 |
| 153508 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.500%, 1/1/47 | &nbsp;&nbsp; 150648 |
| 62101 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.500%, 2/1/47 | &nbsp;&nbsp; 60376 |
| 2174163 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.500%, 8/1/47 | &nbsp;&nbsp; 2150254 |
| 1044688 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.500%, 4/1/50 | &nbsp;&nbsp; 1023836 |
| 4803966 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 4.500%, 6/1/52 | &nbsp;&nbsp; 4624334 |
| 678 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.000%, 3/1/23 | &nbsp;&nbsp;&nbsp; 682 |
| 3603 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.000%, 5/1/23 | &nbsp;&nbsp; 3623 |
| 27407 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.000%, 7/1/34 | &nbsp;&nbsp; 26760 |
| 106715 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.000%, 10/1/34 | &nbsp;&nbsp; 108216 |
| 17000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.000%, 1/1/38 (TBA) | &nbsp;&nbsp; 17074247 |
| 218374 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.000%, 2/1/39 | &nbsp;&nbsp; 220276 |
| 180448 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.000%, 6/1/40 | &nbsp;&nbsp; 182732 |
| 123390 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.000%, 6/1/40 | &nbsp;&nbsp; 124948 |
| 117922 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.000%, 7/1/40 | &nbsp;&nbsp; 119094 |
| 168783 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.000%, 7/1/40 | &nbsp;&nbsp; 170917 |
| 254829 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.000%, 7/1/40 | &nbsp;&nbsp; 255672 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2273

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 204134 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.000%, 8/1/40 | $206715 |
| 681027 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.000%, 2/1/41 | &nbsp;&nbsp; 686116 |
| 2852998 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.000%, 12/1/44 | &nbsp;&nbsp; 2889018 |
| 144921 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.000%, 6/1/49 | &nbsp;&nbsp; 143631 |
| 515266 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.000%, 9/1/49 | &nbsp;&nbsp; 518964 |
| 2824835 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.000%, 9/1/49 | &nbsp;&nbsp; 2869189 |
| 43592 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.000%, 10/1/49 | &nbsp;&nbsp; 43297 |
| 1962647 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.000%, 6/1/52 | &nbsp;&nbsp; 1971692 |
| 6166110 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.000%, 8/1/52 | &nbsp;&nbsp; 6080837 |
| 9138303 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.000%, 8/1/52 | &nbsp;&nbsp; 9011927 |
| 4585 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.500%, 6/1/33 | &nbsp;&nbsp; 4629 |
| 30760 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.500%, 7/1/33 | &nbsp;&nbsp; 31612 |
| 167864 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.500%, 7/1/34 | &nbsp;&nbsp; 173204 |
| 6624 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.500%, 10/1/35 | &nbsp;&nbsp; 6821 |
| 52637 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.500%, 3/1/36 | &nbsp;&nbsp; 53024 |
| 44305 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.500%, 5/1/36 | &nbsp;&nbsp; 44817 |
| 55499 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.500%, 6/1/36 | &nbsp;&nbsp; 57517 |
| 1391391 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.500%, 11/1/52 | &nbsp;&nbsp; 1395126 |
| 3600000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.500%, 1/1/53 (TBA) | &nbsp;&nbsp; 3608880 |
| 19933 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.720%, 11/1/28 | &nbsp;&nbsp; 19807 |
| 14538 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.720%, 6/1/29 | &nbsp;&nbsp; 14490 |

---

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

74Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 3414 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.900%, 11/1/27 | $3404 |
| 25282 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 5.900%, 4/1/28 | &nbsp;&nbsp; 25203 |
| 245 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 9/1/29 | &nbsp;&nbsp; 254 |
| 733 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 1/1/32 | &nbsp;&nbsp; 745 |
| 4208 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 2/1/32 | &nbsp;&nbsp; 4343 |
| 1802 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 3/1/32 | &nbsp;&nbsp; 1864 |
| 1098 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 8/1/32 | &nbsp;&nbsp; 1136 |
| 143 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 9/1/32 | &nbsp;&nbsp; 148 |
| 14135 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 10/1/32 | &nbsp;&nbsp; 14616 |
| 4086 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 2/1/33 | &nbsp;&nbsp; 4147 |
| 22841 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 3/1/33 | &nbsp;&nbsp; 23620 |
| 24395 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 4/1/33 | &nbsp;&nbsp; 24773 |
| 43055 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 7/1/33 | &nbsp;&nbsp; 43722 |
| 14366 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 11/1/33 | &nbsp;&nbsp; 14857 |
| 39253 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 8/1/34 | &nbsp;&nbsp; 40604 |
| 11658 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 9/1/34 | &nbsp;&nbsp; 11895 |
| 10121 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 9/1/34 | &nbsp;&nbsp; 10498 |
| 37075 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 9/1/34 | &nbsp;&nbsp; 37643 |
| 1155 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 9/1/34 | &nbsp;&nbsp; 1178 |
| 3784 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 10/1/34 | &nbsp;&nbsp; 3913 |
| 3843 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 11/1/34 | &nbsp;&nbsp; 3975 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2275

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 32558 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 11/1/34 | $33062 |
| 1233 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 2/1/35 | &nbsp;&nbsp; 1276 |
| 2592 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 2/1/35 | &nbsp;&nbsp; 2681 |
| 56811 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 4/1/35 | &nbsp;&nbsp; 58757 |
| 8387 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 5/1/35 | &nbsp;&nbsp; 8513 |
| 69808 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 10/1/35 | &nbsp;&nbsp; 70867 |
| 34300 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 12/1/35 | &nbsp;&nbsp; 34925 |
| 8018 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 12/1/37 | &nbsp;&nbsp; 8312 |
| 61016 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 6/1/38 | &nbsp;&nbsp; 62406 |
| 6762 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 7/1/38 | &nbsp;&nbsp; 6864 |
| 44002557 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.000%, 12/1/52 | &nbsp;&nbsp; 44665408 |
| 4203 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.500%, 7/1/29 | &nbsp;&nbsp; 4306 |
| 288 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.500%, 4/1/31 | &nbsp;&nbsp;&nbsp; 295 |
| 1474 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.500%, 5/1/31 | &nbsp;&nbsp; 1510 |
| 2027 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.500%, 9/1/31 | &nbsp;&nbsp; 2079 |
| 2060 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.500%, 9/1/31 | &nbsp;&nbsp; 2113 |
| 1322 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.500%, 10/1/31 | &nbsp;&nbsp; 1355 |
| 55356 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.500%, 12/1/31 | &nbsp;&nbsp; 56714 |
| 3366 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.500%, 2/1/32 | &nbsp;&nbsp; 3449 |
| 12324 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.500%, 3/1/32 | &nbsp;&nbsp; 12627 |
| 22861 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.500%, 7/1/32 | &nbsp;&nbsp; 23422 |

---

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

76Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 10704 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.500%, 7/1/34 | $10985 |
| 36377 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.500%, 11/1/37 | &nbsp;&nbsp; 38656 |
| 8520 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 6.500%, 11/1/47 | &nbsp;&nbsp; 8682 |
| 39 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 7.000%, 12/1/30 | &nbsp;&nbsp;&nbsp; 39 |
| 2856 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 7.000%, 12/1/30 | &nbsp;&nbsp; 2875 |
| 2297 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 7.000%, 4/1/31 | &nbsp;&nbsp; 2365 |
| 3108 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 7.000%, 9/1/31 | &nbsp;&nbsp; 3246 |
| 11031 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 7.000%, 12/1/31 | &nbsp;&nbsp; 11026 |
| 7667 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Federal National Mortgage Association, 7.000%, 1/1/32 | &nbsp;&nbsp; 8023 |
| 6000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association, 3.000%, 1/15/53 (TBA) | &nbsp;&nbsp; 5341091 |
| 12000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association, 3.500%, 1/15/53 (TBA) | &nbsp;&nbsp; 11023383 |
| 2000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association, 6.000%, 1/20/53 (TBA) | &nbsp;&nbsp; 2031778 |
| 2458000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 3.500%, 11/15/41 | &nbsp;&nbsp; 2312295 |
| 1743474 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 3.500%, 7/15/42 | &nbsp;&nbsp; 1639763 |
| 304688 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 3.500%, 10/15/42 | &nbsp;&nbsp; 286537 |
| 521406 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 3.500%, 1/15/44 | &nbsp;&nbsp; 490338 |
| 1732225 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 3.500%, 1/15/45 | &nbsp;&nbsp; 1629409 |
| 637017 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 3.500%, 8/15/46 | &nbsp;&nbsp; 594449 |
| 6308 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 5/15/39 | &nbsp;&nbsp; 6054 |
| 1041 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 6/15/39 | &nbsp;&nbsp; 1008 |
| 1604 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 8/15/40 | &nbsp;&nbsp; 1544 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2277

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 121689 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 8/15/40 | $118159 |
| 1758 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 9/15/40 | &nbsp;&nbsp; 1693 |
| 1857 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 10/15/40 | &nbsp;&nbsp; 1799 |
| 7271 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 11/15/40 | &nbsp;&nbsp; 6977 |
| 15728 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 11/15/40 | &nbsp;&nbsp; 15226 |
| 4794 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 1/15/41 | &nbsp;&nbsp; 4617 |
| 19570 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 1/15/41 | &nbsp;&nbsp; 18944 |
| 2725 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 2/15/41 | &nbsp;&nbsp; 2638 |
| 23761 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 6/15/41 | &nbsp;&nbsp; 23072 |
| 39233 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 7/15/41 | &nbsp;&nbsp; 37789 |
| 90511 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 9/15/41 | &nbsp;&nbsp; 87189 |
| 3426 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 10/15/41 | &nbsp;&nbsp; 3283 |
| 4775 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 10/15/41 | &nbsp;&nbsp; 4583 |
| 1359 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 11/15/41 | &nbsp;&nbsp; 1303 |
| 1200 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 11/15/41 | &nbsp;&nbsp; 1149 |
| 1455 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 12/15/41 | &nbsp;&nbsp; 1401 |
| 12354 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 2/15/42 | &nbsp;&nbsp; 11925 |
| 243465 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 8/15/43 | &nbsp;&nbsp; 234490 |
| 3345 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 11/15/43 | &nbsp;&nbsp; 3223 |
| 212382 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 3/15/44 | &nbsp;&nbsp; 204539 |
| 783089 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 3/15/44 | &nbsp;&nbsp; 754235 |

---

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

78Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 21678 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 3/15/44 | $21049 |
| 2887 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 3/15/44 | &nbsp;&nbsp; 2803 |
| 474730 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 4/15/44 | &nbsp;&nbsp; 454852 |
| 2956 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 4/15/44 | &nbsp;&nbsp; 2837 |
| 5852 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 4/15/44 | &nbsp;&nbsp; 5649 |
| 60595 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 8/15/44 | &nbsp;&nbsp; 58324 |
| 547071 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 9/15/44 | &nbsp;&nbsp; 526986 |
| 36547 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 9/15/44 | &nbsp;&nbsp; 34967 |
| 54250 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 9/15/44 | &nbsp;&nbsp; 52552 |
| 100084 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 11/15/44 | &nbsp;&nbsp; 96012 |
| 396707 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 12/15/44 | &nbsp;&nbsp; 382031 |
| 172331 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 1/15/45 | &nbsp;&nbsp; 166817 |
| 348407 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 1/15/45 | &nbsp;&nbsp; 333349 |
| 125382 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 1/15/45 | &nbsp;&nbsp; 119965 |
| 358451 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 2/15/45 | &nbsp;&nbsp; 347233 |
| 314612 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 2/15/45 | &nbsp;&nbsp; 302508 |
| 807934 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 3/15/45 | &nbsp;&nbsp; 780483 |
| 693391 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 4/15/45 | &nbsp;&nbsp; 667780 |
| 793968 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 5/15/45 | &nbsp;&nbsp; 760711 |
| 1101449 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 6/15/45 | &nbsp;&nbsp; 1066815 |
| 155303 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 7/15/45 | &nbsp;&nbsp; 150333 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2279

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 207354 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.000%, 8/15/45 | $199694 |
| 29852 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.500%, 6/15/25 | &nbsp;&nbsp; 29662 |
| 15876 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.500%, 7/15/33 | &nbsp;&nbsp; 15651 |
| 45430 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.500%, 9/15/33 | &nbsp;&nbsp; 44824 |
| 68181 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.500%, 10/15/33 | &nbsp;&nbsp; 67128 |
| 46714 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.500%, 10/15/33 | &nbsp;&nbsp; 45883 |
| 3347 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.500%, 2/15/34 | &nbsp;&nbsp; 3281 |
| 5027 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.500%, 3/15/35 | &nbsp;&nbsp; 4954 |
| 52383 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.500%, 4/15/35 | &nbsp;&nbsp; 51322 |
| 25740 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.500%, 10/15/35 | &nbsp;&nbsp; 25248 |
| 27255 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.500%, 4/15/38 | &nbsp;&nbsp; 26897 |
| 248865 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.500%, 12/15/39 | &nbsp;&nbsp; 246117 |
| 109341 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.500%, 1/15/40 | &nbsp;&nbsp; 108544 |
| 60200 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.500%, 9/15/40 | &nbsp;&nbsp; 59814 |
| 162179 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.500%, 10/15/40 | &nbsp;&nbsp; 160998 |
| 100952 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.500%, 4/15/41 | &nbsp;&nbsp; 99626 |
| 235047 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.500%, 5/15/41 | &nbsp;&nbsp; 231253 |
| 164262 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.500%, 6/15/41 | &nbsp;&nbsp; 162621 |
| 102181 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.500%, 7/15/41 | &nbsp;&nbsp; 101242 |
| 83358 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 4.500%, 8/15/41 | &nbsp;&nbsp; 82013 |
| 25092 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.000%, 7/15/33 | &nbsp;&nbsp; 25422 |

---

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

80Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 21262 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.000%, 9/15/33 | $21683 |
| 24829 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.000%, 4/15/34 | &nbsp;&nbsp; 25322 |
| 142305 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.000%, 4/15/35 | &nbsp;&nbsp; 145129 |
| 50284 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.000%, 7/15/40 | &nbsp;&nbsp; 51291 |
| 28869 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.500%, 1/15/29 | &nbsp;&nbsp; 29264 |
| 3419 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.500%, 6/15/33 | &nbsp;&nbsp; 3477 |
| 20491 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.500%, 7/15/33 | &nbsp;&nbsp; 21459 |
| 12867 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.500%, 7/15/33 | &nbsp;&nbsp; 13149 |
| 6559 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.500%, 8/15/33 | &nbsp;&nbsp; 6906 |
| 34463 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.500%, 8/15/33 | &nbsp;&nbsp; 35217 |
| 10310 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.500%, 8/15/33 | &nbsp;&nbsp; 10858 |
| 20708 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.500%, 9/15/33 | &nbsp;&nbsp; 21010 |
| 24125 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.500%, 9/15/33 | &nbsp;&nbsp; 24505 |
| 10242 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.500%, 10/15/33 | &nbsp;&nbsp; 10383 |
| 20431 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.500%, 10/15/33 | &nbsp;&nbsp; 21395 |
| 95717 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.500%, 7/15/34 | &nbsp;&nbsp; 100226 |
| 14766 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.500%, 10/15/34 | &nbsp;&nbsp; 15084 |
| 129120 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.500%, 11/15/34 | &nbsp;&nbsp; 135405 |
| 59870 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.500%, 1/15/35 | &nbsp;&nbsp; 62100 |
| 10575 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.500%, 2/15/35 | &nbsp;&nbsp; 10759 |
| 30097 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.500%, 2/15/35 | &nbsp;&nbsp; 30526 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2281

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 24778 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.500%, 6/15/35 | $25121 |
| 114019 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.500%, 7/15/35 | &nbsp;&nbsp; 118685 |
| 10658 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.500%, 10/15/35 | &nbsp;&nbsp; 10866 |
| 44128 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.500%, 10/15/35 | &nbsp;&nbsp; 45746 |
| 12399 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 5.500%, 2/15/37 | &nbsp;&nbsp; 12902 |
| 11009 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 12/15/23 | &nbsp;&nbsp; 11029 |
| 966 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 1/15/24 | &nbsp;&nbsp; 990 |
| 9066 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 4/15/28 | &nbsp;&nbsp; 9474 |
| 44822 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 9/15/28 | &nbsp;&nbsp; 46003 |
| 2299 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 10/15/28 | &nbsp;&nbsp; 2360 |
| 15922 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 2/15/29 | &nbsp;&nbsp; 16334 |
| 13311 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 2/15/29 | &nbsp;&nbsp; 13749 |
| 5640 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 11/15/31 | &nbsp;&nbsp; 5826 |
| 451 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 3/15/32 | &nbsp;&nbsp; 467 |
| 1859 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 8/15/32 | &nbsp;&nbsp; 1949 |
| 4092 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 9/15/32 | &nbsp;&nbsp; 4196 |
| 65391 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 9/15/32 | &nbsp;&nbsp; 67054 |
| 52909 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 9/15/32 | &nbsp;&nbsp; 54254 |
| 4630 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 10/15/32 | &nbsp;&nbsp; 4747 |
| 5822 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 10/15/32 | &nbsp;&nbsp; 5975 |
| 4134 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 11/15/32 | &nbsp;&nbsp; 4239 |

---

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

82Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 2976 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 11/15/32 | $3052 |
| 113169 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 12/15/32 | &nbsp;&nbsp; 116158 |
| 2475 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 12/15/32 | &nbsp;&nbsp; 2538 |
| 78865 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 12/15/32 | &nbsp;&nbsp; 81064 |
| 25315 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 12/15/32 | &nbsp;&nbsp; 25996 |
| 4900 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 12/15/32 | &nbsp;&nbsp; 5039 |
| 27690 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 12/15/32 | &nbsp;&nbsp; 28395 |
| 73048 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 12/15/32 | &nbsp;&nbsp; 74906 |
| 55038 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 1/15/33 | &nbsp;&nbsp; 58324 |
| 13918 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 1/15/33 | &nbsp;&nbsp; 14292 |
| 32150 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 2/15/33 | &nbsp;&nbsp; 33165 |
| 49176 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 2/15/33 | &nbsp;&nbsp; 50822 |
| 39031 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 2/15/33 | &nbsp;&nbsp; 40077 |
| 10165 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 2/15/33 | &nbsp;&nbsp; 10700 |
| 38939 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 3/15/33 | &nbsp;&nbsp; 41271 |
| 39328 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 3/15/33 | &nbsp;&nbsp; 41674 |
| 20256 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 3/15/33 | &nbsp;&nbsp; 21023 |
| 35214 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 3/15/33 | &nbsp;&nbsp; 36110 |
| 9428 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 3/15/33 | &nbsp;&nbsp; 9668 |
| 43722 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 3/15/33 | &nbsp;&nbsp; 45624 |
| 175707 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 3/15/33 | &nbsp;&nbsp; 182717 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2283

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 75740 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 3/15/33 | $80258 |
| 1599 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 4/15/33 | &nbsp;&nbsp; 1640 |
| 14058 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 4/15/33 | &nbsp;&nbsp; 14415 |
| 44930 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 5/15/33 | &nbsp;&nbsp; 46136 |
| 3728 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 6/15/33 | &nbsp;&nbsp; 3893 |
| 19762 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 9/15/33 | &nbsp;&nbsp; 20669 |
| 1041 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 9/15/33 | &nbsp;&nbsp; 1067 |
| 10344 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 10/15/33 | &nbsp;&nbsp; 10619 |
| 36302 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 11/15/33 | &nbsp;&nbsp; 37226 |
| 76471 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 3/15/34 | &nbsp;&nbsp; 79224 |
| 16586 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 6/15/34 | &nbsp;&nbsp; 17349 |
| 10385 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 8/15/34 | &nbsp;&nbsp; 10954 |
| 35941 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 8/15/34 | &nbsp;&nbsp; 36857 |
| 4198 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 9/15/34 | &nbsp;&nbsp; 4307 |
| 30038 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 9/15/34 | &nbsp;&nbsp; 30844 |
| 47658 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 9/15/34 | &nbsp;&nbsp; 50077 |
| 36177 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 10/15/34 | &nbsp;&nbsp; 37097 |
| 34529 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 10/15/34 | &nbsp;&nbsp; 35592 |
| 38387 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 10/15/34 | &nbsp;&nbsp; 39418 |
| 47253 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 11/15/34 | &nbsp;&nbsp; 48816 |
| 211466 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 9/15/35 | &nbsp;&nbsp; 220334 |

---

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

84Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 69552 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 8/15/36 | $73697 |
| 28997 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 10/15/36 | &nbsp;&nbsp; 30096 |
| 14890 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 11/15/37 | &nbsp;&nbsp; 15705 |
| 11795 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.000%, 8/15/38 | &nbsp;&nbsp; 12146 |
| 1458 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 10/15/24 | &nbsp;&nbsp; 1459 |
| 2898 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 4/15/28 | &nbsp;&nbsp; 2979 |
| 20275 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 4/15/28 | &nbsp;&nbsp; 21071 |
| 2498 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 6/15/28 | &nbsp;&nbsp; 2567 |
| 2027 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 8/15/28 | &nbsp;&nbsp; 2086 |
| 2837 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 10/15/28 | &nbsp;&nbsp; 2916 |
| 1223 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 10/15/28 | &nbsp;&nbsp; 1257 |
| 11962 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 1/15/29 | &nbsp;&nbsp; 12295 |
| 2631 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 2/15/29 | &nbsp;&nbsp; 2705 |
| 3357 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 2/15/29 | &nbsp;&nbsp; 3451 |
| 436 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 2/15/29 | &nbsp;&nbsp; 449 |
| 1003 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 3/15/29 | &nbsp;&nbsp; 1031 |
| 1012 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 3/15/29 | &nbsp;&nbsp; 1040 |
| 4284 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 3/15/29 | &nbsp;&nbsp; 4404 |
| 13952 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 3/15/29 | &nbsp;&nbsp; 14341 |
| 8798 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 3/15/29 | &nbsp;&nbsp; 9044 |
| 17036 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 5/15/29 | &nbsp;&nbsp; 17511 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2285

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 584 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 5/15/29 | $600 |
| 499 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 5/15/29 | &nbsp;&nbsp; 513 |
| 17245 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 4/15/31 | &nbsp;&nbsp; 17736 |
| 4787 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 5/15/31 | &nbsp;&nbsp; 4978 |
| 27242 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 5/15/31 | &nbsp;&nbsp; 28012 |
| 5086 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 5/15/31 | &nbsp;&nbsp; 5239 |
| 2832 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 6/15/31 | &nbsp;&nbsp; 2912 |
| 9280 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 7/15/31 | &nbsp;&nbsp; 9539 |
| 18502 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 8/15/31 | &nbsp;&nbsp; 19030 |
| 7920 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 9/15/31 | &nbsp;&nbsp; 8143 |
| 25024 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 10/15/31 | &nbsp;&nbsp; 25723 |
| 2736 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 10/15/31 | &nbsp;&nbsp; 2813 |
| 2019 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 11/15/31 | &nbsp;&nbsp; 2075 |
| 31646 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 11/15/31 | &nbsp;&nbsp; 33227 |
| 44346 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 1/15/32 | &nbsp;&nbsp; 45581 |
| 9176 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 1/15/32 | &nbsp;&nbsp; 9431 |
| 6941 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 2/15/32 | &nbsp;&nbsp; 7196 |
| 10989 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 2/15/32 | &nbsp;&nbsp; 11391 |
| 2288 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 2/15/32 | &nbsp;&nbsp; 2352 |
| 6032 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 2/15/32 | &nbsp;&nbsp; 6204 |
| 14512 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 2/15/32 | &nbsp;&nbsp; 14917 |

---

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

86Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 6878 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 3/15/32 | $7069 |
| 19695 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 3/15/32 | &nbsp;&nbsp; 20244 |
| 4786 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 4/15/32 | &nbsp;&nbsp; 4931 |
| 3592 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 4/15/32 | &nbsp;&nbsp; 3692 |
| 15613 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 4/15/32 | &nbsp;&nbsp; 16057 |
| 1734 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 5/15/32 | &nbsp;&nbsp; 1783 |
| 2052 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 5/15/32 | &nbsp;&nbsp; 2109 |
| 4151 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 5/15/32 | &nbsp;&nbsp; 4273 |
| 1585 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 5/15/32 | &nbsp;&nbsp; 1630 |
| 5238 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 6/15/32 | &nbsp;&nbsp; 5396 |
| 5126 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 7/15/32 | &nbsp;&nbsp; 5269 |
| 51637 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 7/15/32 | &nbsp;&nbsp; 53217 |
| 6328 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 7/15/32 | &nbsp;&nbsp; 6504 |
| 13981 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 8/15/32 | &nbsp;&nbsp; 14491 |
| 24625 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 8/15/32 | &nbsp;&nbsp; 25351 |
| 2823 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 8/15/32 | &nbsp;&nbsp; 2902 |
| 20038 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 9/15/32 | &nbsp;&nbsp; 20597 |
| 9020 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 9/15/32 | &nbsp;&nbsp; 9272 |
| 27164 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 9/15/32 | &nbsp;&nbsp; 27923 |
| 13812 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 10/15/32 | &nbsp;&nbsp; 14197 |
| 18813 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 11/15/32 | &nbsp;&nbsp; 19402 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2287

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 97505 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 12/15/32 | $100398 |
| 108985 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 1/15/33 | &nbsp;&nbsp; 113444 |
| 1080 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 1/15/33 | &nbsp;&nbsp; 1110 |
| 14817 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 5/15/33 | &nbsp;&nbsp; 15230 |
| 656 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 10/15/33 | &nbsp;&nbsp; 675 |
| 86731 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 6/15/34 | &nbsp;&nbsp; 89149 |
| 28047 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 4/15/35 | &nbsp;&nbsp; 28829 |
| 4957 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 6/15/35 | &nbsp;&nbsp; 5247 |
| 14295 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 7/15/35 | &nbsp;&nbsp; 14991 |
| 51865 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 6.500%, 7/15/35 | &nbsp;&nbsp; 53310 |
| 679 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 8/15/23 | &nbsp;&nbsp; 679 |
| 4810 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 9/15/24 | &nbsp;&nbsp; 4817 |
| 1219 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 7/15/25 | &nbsp;&nbsp; 1219 |
| 1426 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 11/15/26 | &nbsp;&nbsp; 1442 |
| 3337 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 6/15/27 | &nbsp;&nbsp; 3387 |
| 4202 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 1/15/28 | &nbsp;&nbsp; 4244 |
| 2808 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 4/15/28 | &nbsp;&nbsp; 2806 |
| 4906 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 7/15/28 | &nbsp;&nbsp; 4963 |
| 365 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 8/15/28 | &nbsp;&nbsp; 373 |
| 4218 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 11/15/28 | &nbsp;&nbsp; 4348 |
| 13529 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 11/15/28 | &nbsp;&nbsp; 13885 |

---

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

88Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 13947 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 4/15/29 | $13964 |
| 11529 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 4/15/29 | &nbsp;&nbsp; 11570 |
| 14710 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 5/15/29 | &nbsp;&nbsp; 14718 |
| 3284 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 7/15/29 | &nbsp;&nbsp; 3311 |
| 26550 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 11/15/29 | &nbsp;&nbsp; 26919 |
| 10835 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 12/15/30 | &nbsp;&nbsp; 11278 |
| 1241 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 12/15/30 | &nbsp;&nbsp; 1241 |
| 30415 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 1/15/31 | &nbsp;&nbsp; 30404 |
| 8892 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 6/15/31 | &nbsp;&nbsp; 9349 |
| 1110 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 7/15/31 | &nbsp;&nbsp; 1161 |
| 57621 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 8/15/31 | &nbsp;&nbsp; 60151 |
| 7012 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 9/15/31 | &nbsp;&nbsp; 7026 |
| 6622 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 9/15/31 | &nbsp;&nbsp; 6631 |
| 5884 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 11/15/31 | &nbsp;&nbsp; 5901 |
| 28580 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 3/15/32 | &nbsp;&nbsp; 29097 |
| 19385 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 4/15/32 | &nbsp;&nbsp; 19699 |
| 39354 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.000%, 5/15/32 | &nbsp;&nbsp; 41456 |
| 2058 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.500%, 10/15/23 | &nbsp;&nbsp; 2061 |
| 318 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.500%, 6/15/24 | &nbsp;&nbsp; 318 |
| 2981 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.500%, 8/15/25 | &nbsp;&nbsp; 2979 |
| 710 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.500%, 9/15/25 | &nbsp;&nbsp; 715 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2289

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 2534 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.500%, 2/15/27 | $2537 |
| 8528 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.500%, 3/15/27 | &nbsp;&nbsp; 8721 |
| 16928 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.500%, 10/15/27 | &nbsp;&nbsp; 17225 |
| 8640 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.500%, 6/15/29 | &nbsp;&nbsp; 8829 |
| 3893 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.500%, 8/15/29 | &nbsp;&nbsp; 3891 |
| 6448 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.500%, 9/15/29 | &nbsp;&nbsp; 6445 |
| 11381 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.500%, 2/15/31 | &nbsp;&nbsp; 11434 |
| 10268 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.500%, 2/15/31 | &nbsp;&nbsp; 10263 |
| 4424 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.500%, 3/15/31 | &nbsp;&nbsp; 4439 |
| 8756 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.500%, 12/15/31 | &nbsp;&nbsp; 8804 |
| 1515 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association I, 7.750%, 2/15/30 | &nbsp;&nbsp; 1515 |
| 27935355 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 2.500%, 4/20/52 | &nbsp;&nbsp; 24201159 |
| 47991647 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 3.000%, 5/20/52 | &nbsp;&nbsp; 42733235 |
| 129193 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 3.500%, 3/20/45 | &nbsp;&nbsp; 117489 |
| 228740 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 3.500%, 4/20/45 | &nbsp;&nbsp; 213434 |
| 461434 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 3.500%, 4/20/45 | &nbsp;&nbsp; 430563 |
| 168140 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 3.500%, 4/20/45 | &nbsp;&nbsp; 156848 |
| 584290 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 3.500%, 3/20/46 | &nbsp;&nbsp; 545064 |
| 19855212 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 3.500%, 9/20/52 | &nbsp;&nbsp; 18243981 |
| 12966419 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 3.500%, 11/20/52 | &nbsp;&nbsp; 11914210 |
| 1800651 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 4.000%, 7/20/44 | &nbsp;&nbsp; 1732373 |

---

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

90Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 71392 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 4.000%, 9/20/44 | $68712 |
| 436714 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 4.000%, 10/20/44 | &nbsp;&nbsp; 420088 |
| 1315259 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 4.000%, 10/20/46 | &nbsp;&nbsp; 1264884 |
| 806878 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 4.000%, 2/20/48 | &nbsp;&nbsp; 768593 |
| 1106911 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 4.000%, 4/20/48 | &nbsp;&nbsp; 1054386 |
| 19865311 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 4.000%, 9/20/52 | &nbsp;&nbsp; 18799406 |
| 11943049 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 4.000%, 10/20/52 | &nbsp;&nbsp; 11302227 |
| 18547 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 4.500%, 12/20/34 | &nbsp;&nbsp; 18510 |
| 94419 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 4.500%, 1/20/35 | &nbsp;&nbsp; 94235 |
| 14938 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 4.500%, 3/20/35 | &nbsp;&nbsp; 14908 |
| 349059 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 4.500%, 9/20/41 | &nbsp;&nbsp; 348377 |
| 1305886 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 4.500%, 9/20/44 | &nbsp;&nbsp; 1311290 |
| 466322 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 4.500%, 10/20/44 | &nbsp;&nbsp; 467492 |
| 921623 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 4.500%, 11/20/44 | &nbsp;&nbsp; 924362 |
| 1015329 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 4.500%, 2/20/48 | &nbsp;&nbsp; 999678 |
| 26809720 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 4.500%, 9/20/52 | &nbsp;&nbsp; 26011619 |
| 5973993 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 4.500%, 10/20/52 | &nbsp;&nbsp; 5796154 |
| 25000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 5.000%, 12/20/52 | &nbsp;&nbsp; 24806800 |
| 64509 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 5.500%, 3/20/34 | &nbsp;&nbsp; 66646 |
| 51694 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 5.500%, 4/20/34 | &nbsp;&nbsp; 52978 |
| 36571 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 5.500%, 10/20/37 | &nbsp;&nbsp; 36863 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2291

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 5000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 5.500%, 12/20/52 | $5031064 |
| 51735 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 5.750%, 6/20/33 | &nbsp;&nbsp; 52321 |
| 14212 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 5.900%, 1/20/28 | &nbsp;&nbsp; 14416 |
| 24702 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 5.900%, 7/20/28 | &nbsp;&nbsp; 24875 |
| 6161 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 6.000%, 10/20/31 | &nbsp;&nbsp; 6420 |
| 30151 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 6.000%, 1/20/33 | &nbsp;&nbsp; 31238 |
| 33142 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 6.000%, 10/20/33 | &nbsp;&nbsp; 34986 |
| 19501 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 6.000%, 6/20/34 | &nbsp;&nbsp; 20588 |
| 50324 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 6.450%, 1/20/33 | &nbsp;&nbsp; 50694 |
| 1056 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 6.500%, 1/20/24 | &nbsp;&nbsp; 1055 |
| 12003 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 6.500%, 8/20/28 | &nbsp;&nbsp; 12134 |
| 592 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 6.500%, 2/20/29 | &nbsp;&nbsp;&nbsp; 607 |
| 216 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 6.500%, 3/20/29 | &nbsp;&nbsp;&nbsp; 219 |
| 7357 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 6.500%, 4/20/29 | &nbsp;&nbsp; 7442 |
| 4028 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 6.500%, 4/20/31 | &nbsp;&nbsp; 4201 |
| 2950 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 6.500%, 6/20/31 | &nbsp;&nbsp; 3077 |
| 14073 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 6.500%, 10/20/32 | &nbsp;&nbsp; 14445 |
| 19192 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 6.500%, 3/20/34 | &nbsp;&nbsp; 19729 |
| 1554 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 7.000%, 5/20/26 | &nbsp;&nbsp; 1566 |
| 5935 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 7.000%, 8/20/27 | &nbsp;&nbsp; 6068 |
| 5070 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 7.000%, 6/20/28 | &nbsp;&nbsp; 5159 |

---

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

92Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 22060 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 7.000%, 11/20/28 | $22429 |
| 20501 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 7.000%, 1/20/29 | &nbsp;&nbsp; 21027 |
| 1884 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 7.000%, 2/20/29 | &nbsp;&nbsp; 1925 |
| 661 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 7.000%, 12/20/30 | &nbsp;&nbsp;&nbsp; 675 |
| 3485 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 7.000%, 1/20/31 | &nbsp;&nbsp; 3640 |
| 1867 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 7.000%, 3/20/31 | &nbsp;&nbsp; 1929 |
| 11341 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 7.000%, 7/20/31 | &nbsp;&nbsp; 11946 |
| 3803 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 7.000%, 11/20/31 | &nbsp;&nbsp; 3931 |
| 4014 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 7.500%, 5/20/30 | &nbsp;&nbsp; 4198 |
| 1045 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 7.500%, 6/20/30 | &nbsp;&nbsp; 1079 |
| 1432 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 7.500%, 7/20/30 | &nbsp;&nbsp; 1462 |
| 4181 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 7.500%, 8/20/30 | &nbsp;&nbsp; 4384 |
| 1955 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 7.500%, 12/20/30 | &nbsp;&nbsp; 2046 |
| 4 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 8.000%, 5/20/25 | &nbsp;&nbsp;&nbsp; 4 |
| 522 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Government National Mortgage Association II, 9.000%, 11/20/24 | &nbsp;&nbsp;&nbsp; 521 |
| 150,000,000(e) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;U.S. Treasury Bills, 1/10/23 | &nbsp;&nbsp; 149894485 |
| 39,000,000(e) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;U.S. Treasury Bills, 1/24/23 | &nbsp;&nbsp; 38912623 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2293

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**Principal <br> Amount<br> USD ($)** |  | **Value** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U.S. Government and Agency Obligations —<br> (continued)** |  |
| 180000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;U.S. Treasury Bonds, 2.250%, 2/15/52 | $125170312 |
| 180000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;U.S. Treasury Bonds, 2.875%, 5/15/52 | &nbsp;&nbsp; 144225000 |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total U.S. Government and Agency Obligations<br> (Cost $1,786,871,794)** | **$1708448107** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**TOTAL INVESTMENTS IN UNAFFILIATED ISSUERS — 102.6%<br> (Cost $4,750,402,963)** | **$4267717979** |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**OTHER ASSETS AND LIABILITIES — (2.6)%** | $(108185962) |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**net assets — 100.0%** | **$4159532017** |

---

---

| | |
|:---|:---|
| (TBA) | &nbsp;&nbsp;"To Be Announced" Securities. |
| bps | &nbsp;&nbsp;Basis Points. |
| CMT | &nbsp;&nbsp;Constant Maturity Treasury Index. |
| FREMF | &nbsp;&nbsp;Freddie Mac Multifamily Fixed-Rate Mortgage Loans. |
| FRESB | &nbsp;&nbsp;Freddie Mac Multifamily Small Balance Certificates. |
| ICE | &nbsp;&nbsp;Intercontinental Exchange. |
| LIBOR | &nbsp;&nbsp;London Interbank Offered Rate. |
| REIT | &nbsp;&nbsp;Real Estate Investment Trust. |
| REMICs | &nbsp;&nbsp;Real Estate Mortgage Investment Conduits. |
| SOFR | &nbsp;&nbsp;Secured Overnight Financing Rate. |
| SOFR30A | &nbsp;&nbsp;Secured Overnight Financing Rate 30 Day Average. |
| (144A) | &nbsp;&nbsp;Security is exempt from registration under Rule 144A of the Securities Act of 1933. Such securities may be resold normally to qualified institutional buyers in a transaction exempt from registration. At December 31, 2022, the value of these securities amounted to $1,587,046,084, or 38.2% of net assets. |

---

(a) Floating rate note. Coupon
rate, reference index and spread shown at December 31, 2022.

(b) The
interest rate is subject to change periodically. The interest rate and/or reference index and spread shown at December 31, 2022.

(c) Security
represents the interest-only portion payments on a pool of underlying mortgages or mortgage-backed securities.

(d) Debt
obligation initially issued at one coupon which converts to a higher coupon at a speciﬁc date. The rate shown is the rate at December 31, 2022.

(e) Security
issued with a zero coupon. Income is recognized through accretion of discount.

(f) Security
is perpetual in nature and has no stated maturity date.

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

94Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | |
|:---|:---|
| (g) | &nbsp;&nbsp;Consists of Revenue Bonds unless otherwise indicated. |
| (h) | &nbsp;&nbsp;Represents a General Obligation Bond. |
| (i) | &nbsp;&nbsp;Issued as participation notes. |
| (j) | &nbsp;&nbsp;Non-income producing security. |
| (k) | &nbsp;&nbsp;Issued as preference shares. |
| \* | &nbsp;&nbsp;Senior secured ﬂoating rate loan interests in which the Fund invests generally pay interest at rates that are periodically re-determined by reference to a base lending rate plus a premium. These base lending rates are generally (i) the lending rate offered by one or more major European banks, such as LIBOR or SOFR, (ii) the prime rate offered by one or more major United States banks, (iii) the rate of a certiﬁcate of deposit or (iv) other base lending rates used by commercial lenders. The interest rate shown is the rate accruing at December 31, 2022. |
| † | &nbsp;&nbsp;Amount rounds to less than 0.1%. |
| + | &nbsp;&nbsp;Security is valued using significant unobservable inputs (Level 3). |
| # | &nbsp;&nbsp;Securities are restricted as to resale. |

---

---

| | | | |
|:---|:---|:---|:---|
| &nbsp;&nbsp;**Restricted Securities** | **Acquisition date** | &nbsp;&nbsp;&nbsp;&nbsp;**Cost** | &nbsp;&nbsp;&nbsp;&nbsp;**Value** |
| &nbsp;&nbsp;Adare Re 2022 | 12/30/2021 | &nbsp;&nbsp;&nbsp;&nbsp;$1006000 | &nbsp;&nbsp;&nbsp;&nbsp;$1054819 |
| &nbsp;&nbsp;Ailsa Re 2022 | 6/30/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1208550 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1241343 |
| &nbsp;&nbsp;Alamo Re II | 11/23/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3202948 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3243500 |
| &nbsp;&nbsp;Alturas Re 2019-1 | 12/20/2018 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2200 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10061 |
| &nbsp;&nbsp;Alturas Re 2019-2 | 12/19/2018 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;34018 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10239 |
| &nbsp;&nbsp;Alturas Re 2019-3 | 6/26/2019 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;24550 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;304 |
| &nbsp;&nbsp;Alturas Re 2020-1A | 12/27/2019 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;285668 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10827 |
| &nbsp;&nbsp;Alturas Re 2020-1B | 1/1/2020 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;363577 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;13780 |
| &nbsp;&nbsp;Alturas Re 2020-2 | 1/1/2020 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;540698 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;78996 |
| &nbsp;&nbsp;Alturas Re 2020-3 | 8/3/2020 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— |
| &nbsp;&nbsp;Alturas Re 2021-2 | 2/16/2021 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;206902 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— |
| &nbsp;&nbsp;Alturas Re 2021-3 | 8/16/2021 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;72797 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;45792 |
| &nbsp;&nbsp;Alturas Re 2022-2 | 1/18/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3159827 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2962970 |
| &nbsp;&nbsp;Ballybunion Re 2020 | 12/31/2019 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;548976 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;903793 |
| &nbsp;&nbsp;Ballybunion Re 2021-3 | 8/4/2021 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;47291 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;100616 |
| &nbsp;&nbsp;Ballybunion Re 2022 | 3/9/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1750000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1780366 |
| &nbsp;&nbsp;Ballybunion Re 2022-2 | 8/5/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3046530 |
| &nbsp;&nbsp;Ballybunion Re 2022-3 | 8/5/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4089129 |
| &nbsp;&nbsp;Ballylifin Re 2022 | 7/15/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1629000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9200 |
| &nbsp;&nbsp;Bantry Re 2019 | 2/1/2019 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;85091 |
| &nbsp;&nbsp;Bantry Re 2021 | 1/11/2021 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;518390 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;446963 |
| &nbsp;&nbsp;Bantry Re 2022 | 2/2/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4171573 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4349625 |
| &nbsp;&nbsp;Berwick Re 2018-1 | 1/10/2018 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1488753 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;787862 |
| &nbsp;&nbsp;Berwick Re 2019-1 | 12/31/2018 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;870105 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1161437 |
| &nbsp;&nbsp;Berwick Re 2020-1 | 9/24/2020 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;300 |
| &nbsp;&nbsp;Berwick Re 2022 | 12/28/2021 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4500000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4506300 |
| &nbsp;&nbsp;Bonanza Re | 3/11/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;250000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;200000 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2295

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | | |
|:---|:---|:---|:---|
| &nbsp;&nbsp;**Restricted Securities** | **Acquisition date** | &nbsp;&nbsp;&nbsp;&nbsp;**Cost** | &nbsp;&nbsp;&nbsp;&nbsp;**Value** |
| &nbsp;&nbsp;Caelus Re V | 4/27/2017 | &nbsp;&nbsp;&nbsp;&nbsp;$100000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$80000 |
| &nbsp;&nbsp;Carnoustie Re 2020 | 7/16/2020 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;91015 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;271200 |
| &nbsp;&nbsp;Carnoustie Re 2021 | 1/25/2021 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;62107 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;87866 |
| &nbsp;&nbsp;Carnoustie Re 2022 | 1/20/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1059539 |
| &nbsp;&nbsp;Celadon Re 2022 | 9/13/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1701203 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1926256 |
| &nbsp;&nbsp;Commonwealth Re | 6/15/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;942500 |
| &nbsp;&nbsp;Denning Re 2022 | 7/11/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1709447 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1733561 |
| &nbsp;&nbsp;Easton Re Pte | 7/19/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;245168 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;233700 |
| &nbsp;&nbsp;Eden Re II | 12/14/2018 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1728 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4221 |
| &nbsp;&nbsp;Eden Re II | 1/22/2019 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6926 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;49824 |
| &nbsp;&nbsp;Eden Re II | 12/16/2019 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;210000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;98700 |
| &nbsp;&nbsp;Eden Re II | 12/23/2019 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;528889 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;247040 |
| &nbsp;&nbsp;Eden Re II | 1/25/2021 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;790856 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;449206 |
| &nbsp;&nbsp;Eden Re II | 1/21/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5200000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4837040 |
| &nbsp;&nbsp;FloodSmart Re | 2/9/2021 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;759375 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;675000 |
| &nbsp;&nbsp;FloodSmart Re | 2/16/2021 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1250000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1125000 |
| &nbsp;&nbsp;FloodSmart Re | 2/14/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1860000 |
| &nbsp;&nbsp;Formby Re 2018 | 7/9/2018 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4661 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;48035 |
| &nbsp;&nbsp;Four Lakes Re | 12/15/2021 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;500000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;459700 |
| &nbsp;&nbsp;Four Lakes Re | 12/22/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2999700 |
| &nbsp;&nbsp;Gamboge Re 2022 | 4/11/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4946117 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5363973 |
| &nbsp;&nbsp;Gleneagles Re 2018 | 12/27/2017 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;80273 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;118300 |
| &nbsp;&nbsp;Gleneagles Re 2021 | 1/13/2021 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;300732 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;277857 |
| &nbsp;&nbsp;Gleneagles Re 2022 | 1/18/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1250000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1289063 |
| &nbsp;&nbsp;Gullane Re 2018 | 3/26/2018 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;131133 |
| &nbsp;&nbsp;Gullane Re 2022 | 2/14/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6381951 |
| &nbsp;&nbsp;Harambee Re 2018 | 12/19/2017 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;42461 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— |
| &nbsp;&nbsp;Harambee Re 2019 | 12/20/2018 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6000 |
| &nbsp;&nbsp;Harambee Re 2020 | 2/27/2020 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;59200 |
| &nbsp;&nbsp;Herbie Re | 10/19/2020 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;500000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;425000 |
| &nbsp;&nbsp;Integrity Re | 5/9/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;750000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;637500 |
| &nbsp;&nbsp;International Bank for Reconstruction & Development | 2/28/2020 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;250000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;240400 |
| &nbsp;&nbsp;Isosceles Re 2022 | 8/11/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1871288 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1997600 |
| &nbsp;&nbsp;Isosceles Re 2022-A | 7/6/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1200 |
| &nbsp;&nbsp;Isosceles Re 2022-A | 7/6/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5200 |
| &nbsp;&nbsp;Kilimanjaro III Re | 6/15/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;897400 |
| &nbsp;&nbsp;Limestone Re | 6/20/2018 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1101 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— |
| &nbsp;&nbsp;Limestone Re 2020-1 | 12/15/2016 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2400 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7056 |
| &nbsp;&nbsp;Limestone Re 2020-1 | 12/27/2019 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7100 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;20874 |
| &nbsp;&nbsp;Lion Rock Re 2019 | 12/17/2018 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— |
| &nbsp;&nbsp;Lion Rock Re 2020 | 3/27/2020 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— |
| &nbsp;&nbsp;Lion Rock Re 2021 | 3/1/2021 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;214229 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;104650 |
| &nbsp;&nbsp;Long Point Re IV | 5/13/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3500000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3316950 |

---

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

96Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | | |
|:---|:---|:---|:---|
| &nbsp;&nbsp;**Restricted Securities** | **Acquisition date** | &nbsp;&nbsp;&nbsp;&nbsp;**Cost** | &nbsp;&nbsp;&nbsp;&nbsp;**Value** |
| &nbsp;&nbsp;Lorenz Re 2019 | 6/26/2019 | &nbsp;&nbsp;&nbsp;&nbsp;$656422 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$5388 |
| &nbsp;&nbsp;Matterhorn Re | 1/29/2020 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1248888 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1050000 |
| &nbsp;&nbsp;Matterhorn Re | 12/15/2021 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;250000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;198475 |
| &nbsp;&nbsp;Matterhorn Re | 3/10/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1721400 |
| &nbsp;&nbsp;Matterhorn Re | 3/10/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;853700 |
| &nbsp;&nbsp;Merion Re 2018-2 | 12/28/2017 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;288065 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1059800 |
| &nbsp;&nbsp;Merion Re 2021-2 | 12/28/2020 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2448846 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1768500 |
| &nbsp;&nbsp;Merion Re 2022-1 | 1/25/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;214942 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;253650 |
| &nbsp;&nbsp;Merion Re 2022-2 | 3/1/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6551154 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6211225 |
| &nbsp;&nbsp;Mona Lisa Re, Ltd. | 12/30/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1000000 |
| &nbsp;&nbsp;Mystic Re IV | 12/16/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3400000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3398300 |
| &nbsp;&nbsp;Northshore Re II | 6/22/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;750000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;712050 |
| &nbsp;&nbsp;Oakmont Re 2020 | 12/3/2020 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— |
| &nbsp;&nbsp;Oakmont Re 2022 | 5/9/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1035197 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1415274 |
| &nbsp;&nbsp;Old Head Re 2022 | 1/6/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;188289 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;125000 |
| &nbsp;&nbsp;Pangaea Re 2018-1 | 12/26/2017 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;543427 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;80007 |
| &nbsp;&nbsp;Pangaea Re 2019-1 | 1/9/2019 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;42174 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;83704 |
| &nbsp;&nbsp;Pangaea Re 2019-3 | 7/25/2019 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;143386 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;171924 |
| &nbsp;&nbsp;Pangaea Re 2022-1 | 1/11/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4727246 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5052150 |
| &nbsp;&nbsp;Pangaea Re 2022-3 | 6/15/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2750000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2822314 |
| &nbsp;&nbsp;Phoenician Re | 12/1/2021 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;914800 |
| &nbsp;&nbsp;Phoenix One Re | 12/21/2020 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1250000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1415125 |
| &nbsp;&nbsp;Pine Valley Re 2022 | 1/12/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;911513 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;992080 |
| &nbsp;&nbsp;Port Royal Re 2022 | 6/2/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;483420 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;497500 |
| &nbsp;&nbsp;Portsalon Re 2022 | 7/15/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;404317 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;458460 |
| &nbsp;&nbsp;Residential Re | 11/22/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1750000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1743350 |
| &nbsp;&nbsp;RosaPenna Re 2022 | 8/26/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2023249 |
| &nbsp;&nbsp;Sakura Re | 12/22/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;750000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;749925 |
| &nbsp;&nbsp;Sanders Re II | 11/23/2021 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2754375 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2549250 |
| &nbsp;&nbsp;Sanders Re III | 11/30/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;998500 |
| &nbsp;&nbsp;Sector Re V | 4/23/2019 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;409514 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;289640 |
| &nbsp;&nbsp;Sector Re V | 5/1/2019 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1914 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;48793 |
| &nbsp;&nbsp;Sector Re V | 12/4/2019 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5785 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;333741 |
| &nbsp;&nbsp;Sector Re V | 1/1/2020 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2892 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;166869 |
| &nbsp;&nbsp;Sector Re V | 4/29/2020 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3490 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;25078 |
| &nbsp;&nbsp;Sector Re V | 12/4/2020 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3326 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— |
| &nbsp;&nbsp;Sector Re V | 12/21/2020 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5986 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— |
| &nbsp;&nbsp;Sector Re V | 12/6/2021 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10694 |
| &nbsp;&nbsp;Sector Re V | 1/5/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;84000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;89833 |
| &nbsp;&nbsp;Sector Re V | 12/30/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4605987 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4605987 |
| &nbsp;&nbsp;Shadow Creek Re 2021 | 8/31/2021 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7593 |
| &nbsp;&nbsp;Sussex Re 2020-1 | 1/21/2020 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5415 |
| &nbsp;&nbsp;Sussex Re 2021-1 | 1/26/2021 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;108514 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;113500 |
| &nbsp;&nbsp;Sutter Re | 6/30/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1742813 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1697150 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2297

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

(unaudited) (continued)

---

| | | | |
|:---|:---|:---|:---|
| &nbsp;&nbsp;**Restricted Securities** | **Acquisition date** | &nbsp;&nbsp;&nbsp;&nbsp;**Cost** | &nbsp;&nbsp;&nbsp;&nbsp;**Value** |
| &nbsp;&nbsp;Thopas Re 2019 | 12/21/2018 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$5100 |
| &nbsp;&nbsp;Thopas Re 2020 | 12/30/2019 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— |
| &nbsp;&nbsp;Thopas Re 2021 | 12/30/2020 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;112700 |
| &nbsp;&nbsp;Thopas Re 2022 | 2/15/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4322800 |
| &nbsp;&nbsp;Torricelli Re 2021 | 7/2/2021 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;237638 |
| &nbsp;&nbsp;Torricelli Re 2022 | 7/26/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4500000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4462200 |
| &nbsp;&nbsp;Veraison Re | 12/14/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;500000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;499750 |
| &nbsp;&nbsp;Vermillion Re 2022 | 2/22/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2866500 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3042600 |
| &nbsp;&nbsp;Versutus Re 2018 | 1/31/2018 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3200 |
| &nbsp;&nbsp;Versutus Re 2019-A | 1/28/2019 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— |
| &nbsp;&nbsp;Versutus Re 2019-B | 12/24/2018 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— |
| &nbsp;&nbsp;Viribus Re 2018 | 12/22/2017 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;21118 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— |
| &nbsp;&nbsp;Viribus Re 2019 | 12/27/2018 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;25915 |
| &nbsp;&nbsp;Viribus Re 2020 | 3/12/2020 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;421904 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;182141 |
| &nbsp;&nbsp;Viribus Re 2022 | 4/18/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3000000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3060000 |
| &nbsp;&nbsp;Vitality Re X | 2/3/2020 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2997778 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2999700 |
| &nbsp;&nbsp;Vitality Re X | 10/18/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;497767 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;499950 |
| &nbsp;&nbsp;Vitality Re XI | 1/31/2020 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;997717 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;947500 |
| &nbsp;&nbsp;Walton Health Re 2019 | 7/18/2019 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;111745 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;189933 |
| &nbsp;&nbsp;Walton Health Re 2022 | 7/13/2022 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2083750 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2327387 |
| &nbsp;&nbsp;Woburn Re 2018 | 3/20/2018 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;507009 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;51702 |
| &nbsp;&nbsp;Woburn Re 2019 | 1/30/2019 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;774718 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;946702 |
| &nbsp;&nbsp;**Total Restricted Securities** |  |  | &nbsp;&nbsp;&nbsp;&nbsp;$142245549 |
| &nbsp;&nbsp;**% of Net assets** |  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.4% |

---

#### FUTURES CONTRACTS<br> FIXED INCOME INDEX FUTURES CONTRACTS

---

| | | | | | |
|:---|:---|:---|:---|:---|:---|
| **Number of<br> Contracts<br> Long** | &nbsp;&nbsp;**Description** | &nbsp;&nbsp;**Expiration <br> Date** | &nbsp;&nbsp;**Notional <br> Amount** | &nbsp;&nbsp;**Market <br> Value** | &nbsp;&nbsp;**Unrealized <br> Appreciation<br> (Depreciation)** |
| 1595 | &nbsp;&nbsp;U.S. 2 Year Note (CBT) | &nbsp;&nbsp;3/31/23 | &nbsp;&nbsp;$326739600 | &nbsp;&nbsp;$327099611 | &nbsp;&nbsp;&nbsp;&nbsp;$360011 |
| 4139 | &nbsp;&nbsp;U.S. 5 Year Note (CBT) | &nbsp;&nbsp;3/31/23 | &nbsp;&nbsp;&nbsp;&nbsp;450206055 | &nbsp;&nbsp;&nbsp;&nbsp;446720987 | &nbsp;&nbsp;&nbsp;&nbsp;(3485068) |
| 1491 | &nbsp;&nbsp;U.S. Long Bond (CBT) | &nbsp;&nbsp;3/22/23 | &nbsp;&nbsp;&nbsp;&nbsp;189255275 | &nbsp;&nbsp;&nbsp;&nbsp;186887531 | &nbsp;&nbsp;&nbsp;&nbsp;(2367744) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;16 | &nbsp;&nbsp;U.S. Ultra Bond (CBT) | &nbsp;&nbsp;3/22/23 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2237209 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2149000 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(88209) |
|  |  |  | &nbsp;&nbsp;$968438139 | &nbsp;&nbsp;$962857129 | &nbsp;&nbsp;$(5581010) |

---

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

98Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | | | | |
|:---|:---|:---|:---|:---|:---|
| **Number of<br> Contracts<br> Short** | &nbsp;&nbsp;**Description** | &nbsp;&nbsp;**Expiration <br> Date** | &nbsp;&nbsp;**Notional <br> Amount** | &nbsp;&nbsp;**Market <br> Value** | &nbsp;&nbsp;**Unrealized <br> Appreciation** |
| 1232 | &nbsp;&nbsp;U.S. 10 Year Note (CBT) | &nbsp;&nbsp;3/22/23 | &nbsp;&nbsp;$(138880576) | &nbsp;&nbsp;$(138349756) | &nbsp;&nbsp;&nbsp;&nbsp;$530820 |
| 1472 | &nbsp;&nbsp;U.S. 10 Year Ultra Bond (CBT) | &nbsp;&nbsp;3/22/23 | &nbsp;&nbsp;&nbsp;&nbsp;(177548875) | &nbsp;&nbsp;&nbsp;&nbsp;(174110000) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3438875 |
|  |  |  | &nbsp;&nbsp;$(316429451) | &nbsp;&nbsp;$(312459756) | &nbsp;&nbsp;$3969695 |
| **TOTAL FUTURES CONTRACTS** | **TOTAL FUTURES CONTRACTS** | **TOTAL FUTURES CONTRACTS** | &nbsp;&nbsp;**$652008688** | &nbsp;&nbsp;**$650397373** | &nbsp;&nbsp;**$(1611315)** |

---

#### SWAP CONTRACTS

#### CENTRALLY CLEARED CREDIT DEFAULT SWAP CONTRACTS – BUY PROTECTION

---

| | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|
| **Notional <br> Amount ($)<sup>(1)</sup>** | **Reference <br> Obligation/Index** | **Pay/ <br> Receive<sup>(2)</sup>** | **Annual <br> Fixed Rate** | **Expiration <br> Date** | **Premiums <br> Paid** | **Unrealized <br> (Depreciation)** | **Market <br> Value** |
| 521350000 | Markit CDX North America High Yield Index Series 39 | Pay | 5.00% | 12/20/27 | $18885247 | $(23144451) | $(4259204) |
| **TOTAL CENTRALLY CLEARED CREDIT DEFAULT<br> SWAP CONTRACTS – BUY PROTECTION** | **TOTAL CENTRALLY CLEARED CREDIT DEFAULT<br> SWAP CONTRACTS – BUY PROTECTION** | **TOTAL CENTRALLY CLEARED CREDIT DEFAULT<br> SWAP CONTRACTS – BUY PROTECTION** | **TOTAL CENTRALLY CLEARED CREDIT DEFAULT<br> SWAP CONTRACTS – BUY PROTECTION** | **TOTAL CENTRALLY CLEARED CREDIT DEFAULT<br> SWAP CONTRACTS – BUY PROTECTION** | $18885247 | $(23144451) | $(4259204) |
| **TOTAL SWAP CONTRACTS** | **TOTAL SWAP CONTRACTS** | **TOTAL SWAP CONTRACTS** | **TOTAL SWAP CONTRACTS** |  | **$18885247** | **$(23144451)** | **$(4259204)** |

---

<sup>(1)</sup> The notional amount is the maximum amount that a seller of credit protection would be obligated to pay upon occurrence of a credit event.

<sup>(2)</sup> Pays quarterly.

Purchases and sales of securities (excluding short-term investments) for the six months ended December 31, 2022 were as follows:

---

| | | |
|:---|:---|:---|
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Purchases** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Sales** |
| Long-Term U.S. Government Securities | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$281504490 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$— |
| Other Long-Term Securities | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$1295098496 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$1250161540 |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/2299

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

### Schedule of Investments \| 12/31/22
(unaudited) (continued)

At December 31, 2022, the net unrealized depreciation on investments based on cost for federal tax purposes of $4,746,526,091 was as follows:

---

| | |
|:---|:---|
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Aggregate gross unrealized appreciation for all investments in which there is an excess of value over tax cost | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$15862234 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Aggregate gross unrealized depreciation for all investments in which there is an excess of tax cost over value | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(500540865) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net unrealized depreciation | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$(484678631) |

---

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

---

| |
|:---|
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Level 1 – unadjusted quoted prices in active markets for identical securities. |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Level 2 – other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risks, etc.). See Notes to Financial Statements — Note 1A. |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Level 3 – significant unobservable inputs (including the Adviser's own assumptions in determining fair value of investments). See Notes to Financial Statements — Note 1A. |

---

The following is a summary of the inputs used as of December 31, 2022, in valuing the Fund's investments:

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | **Level 1** | &nbsp;&nbsp;**Level 2** | &nbsp;&nbsp;**Level 3** | &nbsp;&nbsp;**Total** |
| Senior Secured Floating Rate Loan Interests | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$— | &nbsp;&nbsp;&nbsp;&nbsp;$17826503 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$— | &nbsp;&nbsp;&nbsp;&nbsp;$17826503 |
| Asset Backed Securities | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;346145340 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;346145340 |
| Collateralized Mortgage Obligations | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;522175420 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;522175420 |
| Commercial Mortgage-Backed Securities | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;287504301 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;287504301 |
| Corporate Bonds | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;1171303041 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;1171303041 |
| Convertible Preferred Stocks | &nbsp;&nbsp;&nbsp;35035675 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;35035675 |
| Municipal Bonds | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;37034043 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;37034043 |
| Insurance-Linked Securities |  |  |  |  |
| &nbsp;&nbsp;&nbsp;Collateralized Reinsurance |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Earthquakes – California | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1054819 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1054819 |
| &nbsp;&nbsp;&nbsp;&nbsp;Multiperil – Massachusetts | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3433364 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3433364 |
| &nbsp;&nbsp;&nbsp;&nbsp;Multiperil – U.S. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;10417934 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10417934 |
| &nbsp;&nbsp;&nbsp;&nbsp;Multiperil – Worldwide | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;11206209 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11206209 |
| &nbsp;&nbsp;&nbsp;&nbsp;Windstorm – Florida | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2045635 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2045635 |
| &nbsp;&nbsp;&nbsp;&nbsp;Windstorm - North Carolina | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6400 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6400 |
| &nbsp;&nbsp;&nbsp;&nbsp;Windstorm – U.S. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7593 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7593 |
| &nbsp;&nbsp;&nbsp;&nbsp;Windstorm – U.S. Regional | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1415274 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1415274 |

---

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

100Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | **Level 1** | &nbsp;&nbsp;**Level 2** | &nbsp;&nbsp;**Level 3** | &nbsp;&nbsp;**Total** |
| &nbsp;&nbsp;&nbsp;Reinsurance Sidecars |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Multiperil – U.S. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$— | &nbsp;&nbsp;&nbsp;$1483805 | &nbsp;&nbsp;&nbsp;&nbsp;$1483805 |
| &nbsp;&nbsp;&nbsp;&nbsp;Multiperil – Worldwide | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;68252566 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;68252566 |
| &nbsp;&nbsp;&nbsp;Industry Loss Warranties |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Earthquakes - U.S. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3042600 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3042600 |
| &nbsp;&nbsp;&nbsp;&nbsp;Windstorm – U.S. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9200 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9200 |
| &nbsp;&nbsp;&nbsp;&nbsp;All Other Insurance-Linked Securities | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;39870150 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;39870150 |
| U.S. Government and Agency Obligations | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;1708448107 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;1708448107 |
| **Total Investments in Securities** | **$35035675** | &nbsp;&nbsp;**$4130306905** | &nbsp;&nbsp;**$102375399** | &nbsp;&nbsp;**$4267717979** |
| **Other Financial Instruments** |  |  |  |  |
| &nbsp;&nbsp;&nbsp;Net unrealized depreciation on futures contracts | $(1611315) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$— | &nbsp;&nbsp;&nbsp;&nbsp;$(1611315) |
| &nbsp;&nbsp;&nbsp;Swap contracts, at value | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(4259204) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(4259204) |
| **Total Other Financial Instruments** | **$(1611315)** | &nbsp;&nbsp;&nbsp;&nbsp;**$(4259204)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$—** | &nbsp;&nbsp;&nbsp;&nbsp;**$(5870519)** |

---

The following is a reconciliation of assets valued using significant unobservable inputs (Level 3):

---

| | |
|:---|:---|
|  | **Insurance- <br> Linked<br> Securities** |
| Balance as of 6/30/22 | $102083340 |
| Realized gain (loss)<sup>(1)</sup> | &nbsp;&nbsp;&nbsp;&nbsp;(2154119) |
| Changed in unrealized appreciation (depreciation)<sup>(2)</sup> | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(601955) |
| Return of capital | &nbsp;&nbsp;&nbsp;(15253202) |
| Purchases | &nbsp;&nbsp;&nbsp;&nbsp;31375645 |
| Sales | &nbsp;&nbsp;&nbsp;(13074310) |
| Transfers in to Level 3\* | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— |
| Transfers out of Level 3\* | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— |
| **Balance as of 12/31/22** | **$102375399** |

---

---

| | | |
|:---|:---|:---|
| <sup>(1)</sup> | &nbsp;&nbsp;Realized gain (loss) on these securities is included in the realized gain (loss) from investments on the Statement of Operations. | &nbsp;&nbsp;Realized gain (loss) on these securities is included in the realized gain (loss) from investments on the Statement of Operations. |
| <sup>(2)</sup> | &nbsp;&nbsp;Unrealized appreciation (depreciation) on these securities is included in the change in unrealized appreciation (depreciation) from investments on the Statement of Operations. | &nbsp;&nbsp;Unrealized appreciation (depreciation) on these securities is included in the change in unrealized appreciation (depreciation) from investments on the Statement of Operations. |
| \* | &nbsp;&nbsp;Transfers are calculated on the beginning of period values. Transfers are calculated on the beginning of period values. For the six months ended December 31, 2022, there were no transfers in or out of Level 3. | &nbsp;&nbsp;Transfers are calculated on the beginning of period values. Transfers are calculated on the beginning of period values. For the six months ended December 31, 2022, there were no transfers in or out of Level 3. |
| Net change in unrealized appreciation (depreciation) of Level 3 investments still held and considered Level 3 at December 31, 2022: | Net change in unrealized appreciation (depreciation) of Level 3 investments still held and considered Level 3 at December 31, 2022: | &nbsp;&nbsp;$(1880858) |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/22101

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

Statement of Assets and Liabilities \| 12/31/22 (unaudited)

---

| | |
|:---|:---|
| **ASSETS:** |  |
| &nbsp;&nbsp;&nbsp;Investments in unaffiliated issuers, at value (cost $4,750,402,963) | $4267717979 |
| &nbsp;&nbsp;&nbsp;Cash | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;37259451 |
| &nbsp;&nbsp;&nbsp;Foreign currencies, at value (cost $18) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;18 |
| &nbsp;&nbsp;&nbsp;Futures collateral | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9933308 |
| &nbsp;&nbsp;&nbsp;Swaps collateral | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;35304891 |
| &nbsp;&nbsp;&nbsp;Collateral due from broker for TBA Securities | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1097817 |
| &nbsp;&nbsp;&nbsp;Variation margin for centrally cleared swap contracts | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;125098 |
| &nbsp;&nbsp;&nbsp;Receivables — |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Investment securities sold | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;267371044 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Fund shares sold | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;25884095 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Dividends | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;50714 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Interest | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;24091296 |
| &nbsp;&nbsp;&nbsp;Other assets | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;147160 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total assets** | **$4668982871** |
| **LIABILITIES:** |  |
| &nbsp;&nbsp;&nbsp;Payables — |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Investment securities purchased | &nbsp;&nbsp;&nbsp;$456247270 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Fund shares repurchased | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;45146844 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Distributions | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1644918 |
| &nbsp;&nbsp;&nbsp;Variation margin for futures contracts | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;580649 |
| &nbsp;&nbsp;&nbsp;Swap contracts, at value (net premiums paid $18,885,247) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4259204 |
| &nbsp;&nbsp;&nbsp;Management fees | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;133920 |
| &nbsp;&nbsp;&nbsp;Administrative expenses | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;130044 |
| &nbsp;&nbsp;&nbsp;Distribution fees | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;26007 |
| &nbsp;&nbsp;&nbsp;Accrued expenses | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1281998 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total liabilities** | &nbsp;&nbsp;&nbsp;**$509450854** |
| **NET ASSETS:** |  |
| &nbsp;&nbsp;&nbsp;Paid-in capital | $5042622503 |
| &nbsp;&nbsp;&nbsp;Distributable earnings (loss) | &nbsp;&nbsp;&nbsp;&nbsp;(883090486) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Net assets** | **$4159532017** |
| **NET ASSET VALUE PER SHARE:** |  |
| No par value (unlimited number of shares authorized) |  |
| &nbsp;&nbsp;&nbsp;Class A (based on $538,132,714/66,210,554 shares) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$8.13 |
| &nbsp;&nbsp;&nbsp;Class C (based on $17,535,685/2,182,630 shares) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$8.03 |
| &nbsp;&nbsp;&nbsp;Class K (based on $1,427,926,194/175,854,533 shares) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$8.12 |
| &nbsp;&nbsp;&nbsp;Class R (based on $158,950,662/19,382,485 shares) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$8.20 |
| &nbsp;&nbsp;&nbsp;Class Y (based on $2,016,986,762/250,711,130 shares) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$8.05 |
| **MAXIMUM OFFERING PRICE PER SHARE:** |  |
| &nbsp;&nbsp;&nbsp;Class A (based on $8.13 net asset value per share/100%-4.50% maximum sales charge) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$8.51 |

---

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

102Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

### Statement of Operations (unaudited)

#### FOR THE SIX MONTHS ENDED 12/31/22

---

| | | |
|:---|:---|:---|
| **INVESTMENT INCOME:** |  |  |
| &nbsp;&nbsp;&nbsp;Interest from unaffiliated issuers (net of foreign taxes withheld $20,688) | $89202401 |  |
| &nbsp;&nbsp;&nbsp;Dividends from unaffiliated issuers | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6336100 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Investment Income** |  | &nbsp;&nbsp;&nbsp;&nbsp;**$95538501** |
| **EXPENSES:** |  |  |
| &nbsp;&nbsp;&nbsp;Management fees | &nbsp;&nbsp;&nbsp;$6376241 |  |
| &nbsp;&nbsp;&nbsp;Administrative expenses | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;577821 |  |
| &nbsp;&nbsp;&nbsp;Transfer agent fees |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Class A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;643928 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Class C | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9890 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Class K | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1276 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Class R | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;214261 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Class Y | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1404550 |  |
| &nbsp;&nbsp;&nbsp;Distribution fees |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Class A | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;734558 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Class C | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;98206 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Class R | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;413659 |  |
| &nbsp;&nbsp;&nbsp;Shareowner communications expense | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;185193 |  |
| &nbsp;&nbsp;&nbsp;Custodian fees | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7232 |  |
| &nbsp;&nbsp;&nbsp;Registration fees | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;85145 |  |
| &nbsp;&nbsp;&nbsp;Professional fees | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;130160 |  |
| &nbsp;&nbsp;&nbsp;Printing expense | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;20623 |  |
| &nbsp;&nbsp;&nbsp;Officers' and Trustees' fees | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;132333 |  |
| &nbsp;&nbsp;&nbsp;Miscellaneous | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;105351 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total expenses |  | &nbsp;&nbsp;&nbsp;&nbsp;$11140427 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net investment income |  | &nbsp;&nbsp;&nbsp;&nbsp;**$84398074** |
| **REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS:** |  |  |
| &nbsp;&nbsp;&nbsp;Net realized gain (loss) on: |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Investments in unaffiliated issuers | $(93512713) |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Futures contracts | &nbsp;&nbsp;&nbsp;(53023418) |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Swap contracts | &nbsp;&nbsp;&nbsp;&nbsp;(1351403) | &nbsp;&nbsp;&nbsp;&nbsp;$(147887534) |
| &nbsp;&nbsp;&nbsp;Change in net unrealized appreciation (depreciation) on: |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Investments in unaffiliated issuers | $(89030255) |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Futures contracts | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5821035 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Swap contracts | &nbsp;&nbsp;&nbsp;(43146738) | &nbsp;&nbsp;&nbsp;&nbsp;$(126355958) |
| &nbsp;&nbsp;&nbsp;Net realized and unrealized gain (loss) on investments |  | &nbsp;&nbsp;&nbsp;&nbsp;**$(274243492)** |
| &nbsp;&nbsp;&nbsp;Net decrease in net assets resulting from operations |  | &nbsp;&nbsp;&nbsp;&nbsp;**$(189845418)** |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/22103

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

Statements of Changes in Net Assets

---

| | | |
|:---|:---|:---|
|  | **Six Months<br> Ended<br> 12/31/22<br> (unaudited)** | &nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/22** |
| **FROM OPERATIONS:** |  |  |
| Net investment income (loss) | &nbsp;&nbsp;&nbsp;&nbsp;$84398074 | &nbsp;&nbsp;&nbsp;&nbsp;$129945711 |
| Net realized gain (loss) on investments | &nbsp;&nbsp;&nbsp;&nbsp;(147887534) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(153118689) |
| Change in net unrealized appreciation (depreciation) on investments | &nbsp;&nbsp;&nbsp;&nbsp;(126355958) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(569696578) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net decrease in net assets resulting from operations | $(189845418) | &nbsp;&nbsp;&nbsp;&nbsp;$(592869556) |
| **DISTRIBUTIONS TO SHAREOWNERS:** |  |  |
| &nbsp;&nbsp;&nbsp;Class A ($0.10 and $0.51 per share, respectively) | &nbsp;&nbsp;&nbsp;&nbsp;$(7024446) | &nbsp;&nbsp;&nbsp;&nbsp;$(39380638) |
| &nbsp;&nbsp;&nbsp;Class C ($0.07 and $0.45 per share, respectively) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(172676) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1358899) |
| &nbsp;&nbsp;&nbsp;Class K ($0.12 and $0.56 per share, respectively) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(21279841) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(116418664) |
| &nbsp;&nbsp;&nbsp;Class R ($0.09 and $0.49 per share, respectively) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1739458) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(9594836) |
| &nbsp;&nbsp;&nbsp;Class Y ($0.11 and $0.55 per share, respectively) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(29387880) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(151168110) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total distributions to shareowners | &nbsp;&nbsp;&nbsp;$(59604301) | &nbsp;&nbsp;&nbsp;&nbsp;$(317921147) |
| **FROM FUND SHARE TRANSACTIONS:** |  |  |
| Net proceeds from sales of shares | &nbsp;&nbsp;&nbsp;$693389555 | &nbsp;&nbsp;&nbsp;&nbsp;$1803039268 |
| Reinvestment of distributions | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;51793139 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;277106443 |
| Cost of shares repurchased | &nbsp;&nbsp;&nbsp;&nbsp;(927089924) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2000598487) |
| In-kind redemptions | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(435749235) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net decrease in net assets resulting from Fund share transactions | $(181907230) | &nbsp;&nbsp;&nbsp;&nbsp;$(356202011) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Net decrease in net assets** | **$(431356949)** | &nbsp;&nbsp;&nbsp;&nbsp;**$(1266992714)** |
| **NET ASSETS:** |  |  |
| Beginning of period | $4590888966 | &nbsp;&nbsp;&nbsp;&nbsp;$5857881680 |
| End of period | **$4159532017** | &nbsp;&nbsp;&nbsp;&nbsp;**$4590888966** |

---

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

104Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | **Six Months<br> Ended<br> 12/31/22<br> Shares<br> (unaudited)** | &nbsp;&nbsp;&nbsp;**Six Months<br> Ended<br> 12/31/22<br> Amount<br> (unaudited)** | &nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/22<br> Shares** | &nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/22<br> Amount** |
| **Class A** |  |  |  |  |
| Shares sold | &nbsp;&nbsp;&nbsp;&nbsp;7314573 | &nbsp;&nbsp;&nbsp;&nbsp;$60618878 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;13578207 | &nbsp;&nbsp;&nbsp;&nbsp;$129550585 |
| Reinvestment of distributions | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;662516 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5468600 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3140666 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;30387955 |
| Less shares repurchased | (14502949) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(121123108) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(26002339) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(249150989) |
| &nbsp;&nbsp;&nbsp;Net decrease | &nbsp;&nbsp;&nbsp;(6525860) | &nbsp;&nbsp;&nbsp;&nbsp;$(55035630) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(9283466) | &nbsp;&nbsp;&nbsp;&nbsp;$(89212449) |
| **Class C** |  |  |  |  |
| Shares sold | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;186721 | &nbsp;&nbsp;&nbsp;&nbsp;$1513873 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;331094 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$3176654 |
| Reinvestment of distributions | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;19763 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;161127 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;133978 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1284871 |
| Less shares repurchased | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(536445) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(4375394) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1472085) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(13993199) |
| &nbsp;&nbsp;&nbsp;Net decrease | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(329961) | &nbsp;&nbsp;&nbsp;&nbsp;$(2700394) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1007013) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$(9531674) |
| **Class K** |  |  |  |  |
| Shares sold | &nbsp;&nbsp;&nbsp;26379319 | &nbsp;&nbsp;&nbsp;&nbsp;$218832857 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;90802425 | &nbsp;&nbsp;&nbsp;&nbsp;$873907041 |
| Reinvestment of distributions | &nbsp;&nbsp;&nbsp;&nbsp;2190852 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;18066107 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10478293 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;101133283 |
| Less shares repurchased | (31990246) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(266895723) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(68418693) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(645495421) |
| In-kind redemptions | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(49292900) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(435749235) |
| &nbsp;&nbsp;&nbsp;Net decrease | &nbsp;&nbsp;&nbsp;(3420075) | &nbsp;&nbsp;&nbsp;&nbsp;$(29996759) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(16430875) | &nbsp;&nbsp;&nbsp;&nbsp;$(106204332) |
| **Class R** |  |  |  |  |
| Shares sold | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;864181 | &nbsp;&nbsp;&nbsp;&nbsp;$7243336 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2274287 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$22373070 |
| Reinvestment of distributions | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;207409 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1726554 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;978082 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9557049 |
| Less shares repurchased | &nbsp;&nbsp;&nbsp;(1518074) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(12693182) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(4158866) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(40951362) |
| &nbsp;&nbsp;&nbsp;Net decrease | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(446484) | &nbsp;&nbsp;&nbsp;&nbsp;$(3723292) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(906497) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$(9021243) |
| **Class Y** |  |  |  |  |
| Shares sold | &nbsp;&nbsp;&nbsp;49179793 | &nbsp;&nbsp;&nbsp;&nbsp;$405180611 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;82500622 | &nbsp;&nbsp;&nbsp;&nbsp;$774031918 |
| Reinvestment of distributions | &nbsp;&nbsp;&nbsp;&nbsp;3227011 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;26370751 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;14083841 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;134743285 |
| Less shares repurchased | (63654253) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(522002517) | &nbsp;&nbsp;&nbsp;&nbsp;(112980605) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1051007516) |
| &nbsp;&nbsp;&nbsp;Net decrease | (11247449) | &nbsp;&nbsp;&nbsp;&nbsp;$(90451155) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(16396142) | &nbsp;&nbsp;&nbsp;&nbsp;$(142232313) |

---

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/22105

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

Financial Highlights

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
|  | **Six Months<br> Ended<br> 12/31/22<br> (unaudited)** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/22** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/21** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/20** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/19** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/18** |
| &nbsp;&nbsp;**Class A** |  |  |  |  |  |  |
| &nbsp;&nbsp;Net asset value, beginning of period | &nbsp;&nbsp;&nbsp;&nbsp;$8.60 | &nbsp;&nbsp;&nbsp;&nbsp;$10.14 | &nbsp;&nbsp;&nbsp;&nbsp;$9.98 | &nbsp;&nbsp;&nbsp;&nbsp;$9.79 | &nbsp;&nbsp;&nbsp;&nbsp;$9.45 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$9.71 |
| &nbsp;&nbsp;Increase (decrease) from investment operations: |  |  |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net investment income (loss) (a) | &nbsp;&nbsp;&nbsp;&nbsp;$0.15 | &nbsp;&nbsp;&nbsp;&nbsp;$0.19 | &nbsp;&nbsp;&nbsp;&nbsp;$0.23 | &nbsp;&nbsp;&nbsp;&nbsp;$0.25 | &nbsp;&nbsp;&nbsp;&nbsp;$0.27 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$0.26 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net realized and unrealized gain (loss) on investments | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(0.52) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1.22) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.38 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.23 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.37 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(0.24) |
| &nbsp;&nbsp;**Net increase (decrease) from investment operations** | &nbsp;&nbsp;&nbsp;&nbsp;**$(0.37)** | &nbsp;&nbsp;&nbsp;&nbsp;**$(1.03)** | &nbsp;&nbsp;&nbsp;&nbsp;**$0.61** | &nbsp;&nbsp;&nbsp;&nbsp;**$0.48** | &nbsp;&nbsp;&nbsp;&nbsp;**$0.64** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$0.02** |
| &nbsp;&nbsp;Distributions to shareowners: |  |  |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net investment income | &nbsp;&nbsp;&nbsp;&nbsp;$(0.10) | &nbsp;&nbsp;&nbsp;&nbsp;$(0.16) | &nbsp;&nbsp;&nbsp;&nbsp;$(0.27) | &nbsp;&nbsp;&nbsp;&nbsp;$(0.29) | &nbsp;&nbsp;&nbsp;&nbsp;$(0.30) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$(0.28) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net realized gain | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(0.35) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(0.18) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— |
| &nbsp;&nbsp;**Total distributions** | &nbsp;&nbsp;&nbsp;&nbsp;**$(0.10)** | &nbsp;&nbsp;&nbsp;&nbsp;**$(0.51)** | &nbsp;&nbsp;&nbsp;&nbsp;**$(0.45)** | &nbsp;&nbsp;&nbsp;&nbsp;**$(0.29)** | &nbsp;&nbsp;&nbsp;&nbsp;**$(0.30)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(0.28)** |
| &nbsp;&nbsp;**Net increase (decrease) in net asset value** | &nbsp;&nbsp;&nbsp;&nbsp;**$(0.47)** | &nbsp;&nbsp;&nbsp;&nbsp;**$(1.54)** | &nbsp;&nbsp;&nbsp;&nbsp;**$0.16** | &nbsp;&nbsp;&nbsp;&nbsp;**$0.19** | &nbsp;&nbsp;&nbsp;&nbsp;**$0.34** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(0.26)** |
| &nbsp;&nbsp;Net asset value, end of period | &nbsp;&nbsp;&nbsp;&nbsp;$8.13 | &nbsp;&nbsp;&nbsp;&nbsp;$8.60 | &nbsp;&nbsp;&nbsp;&nbsp;$10.14 | &nbsp;&nbsp;&nbsp;&nbsp;$9.98 | &nbsp;&nbsp;&nbsp;&nbsp;$9.79 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$9.45 |
| &nbsp;&nbsp;**Total return (b)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(4.31)%(c)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(10.66)%** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**6.26%** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**5.01%** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**6.93%** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**0.14%** |
| &nbsp;&nbsp;Ratio of net expenses to average net assets | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.83%(d) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.79% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.82% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.82% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.85% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.85% |
| &nbsp;&nbsp;Ratio of net investment income (loss) to average net assets | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.52%(d) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.02% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.26% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.58% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.88% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.71% |
| &nbsp;&nbsp;Portfolio turnover rate | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;33%(c) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;72% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;59% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;71% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;52% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;45% |
| &nbsp;&nbsp;Net assets, end of period (in thousands) | $538133 | &nbsp;&nbsp;&nbsp;&nbsp;$625834 | &nbsp;&nbsp;&nbsp;&nbsp;$831595 | &nbsp;&nbsp;&nbsp;&nbsp;$960460 | &nbsp;&nbsp;&nbsp;&nbsp;$979874 | &nbsp;&nbsp;&nbsp;&nbsp;$1081121 |
| &nbsp;&nbsp;Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: |  |  |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total expenses to average net assets | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.83%(d) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.79% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.82% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.82% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.87% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.96% |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net investment income (loss) to average net assets | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.52%(d) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.02% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.26% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.58% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.86% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.60% |

---

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

(b) Assumes
initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period and no sales charges. Total return would be reduced if
sales charges were taken into account.

(c) Not
annualized.

(d) Annualized.

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

106Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
|  | **Six Months<br> Ended<br> 12/31/22<br> (unaudited)** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/22** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/21** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/20** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/19** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/18** |
| &nbsp;&nbsp;**Class C** |  |  |  |  |  |  |
| &nbsp;&nbsp;Net asset value, beginning of period | &nbsp;&nbsp;&nbsp;&nbsp;$8.51 | &nbsp;&nbsp;&nbsp;&nbsp;$10.03 | &nbsp;&nbsp;&nbsp;&nbsp;$9.87 | &nbsp;&nbsp;&nbsp;&nbsp;$9.68 | &nbsp;&nbsp;&nbsp;&nbsp;$9.35 | &nbsp;&nbsp;&nbsp;&nbsp;$9.60 |
| &nbsp;&nbsp;Increase (decrease) from investment operations: |  |  |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net investment income (loss) (a) | &nbsp;&nbsp;&nbsp;&nbsp;$0.12 | &nbsp;&nbsp;&nbsp;&nbsp;$0.13 | &nbsp;&nbsp;&nbsp;&nbsp;$0.17 | &nbsp;&nbsp;&nbsp;&nbsp;$0.19 | &nbsp;&nbsp;&nbsp;&nbsp;$0.21 | &nbsp;&nbsp;&nbsp;&nbsp;$0.19 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net realized and unrealized gain (loss) on investments | &nbsp;&nbsp;&nbsp;&nbsp;(0.53) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1.20) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.38 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.23 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.35 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(0.24) |
| &nbsp;&nbsp;**Net increase (decrease) from investment operations** | &nbsp;&nbsp;**$(0.41)** | &nbsp;&nbsp;&nbsp;&nbsp;**$(1.07)** | &nbsp;&nbsp;&nbsp;&nbsp;**$0.55** | &nbsp;&nbsp;&nbsp;&nbsp;**$0.42** | &nbsp;&nbsp;&nbsp;&nbsp;**$0.56** | &nbsp;&nbsp;&nbsp;&nbsp;**$(0.05)** |
| &nbsp;&nbsp;Distributions to shareowners: |  |  |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net investment income | &nbsp;&nbsp;$(0.07) | &nbsp;&nbsp;&nbsp;&nbsp;$(0.10) | &nbsp;&nbsp;&nbsp;&nbsp;$(0.21) | &nbsp;&nbsp;&nbsp;&nbsp;$(0.23) | &nbsp;&nbsp;&nbsp;&nbsp;$(0.23) | &nbsp;&nbsp;&nbsp;&nbsp;$(0.20) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net realized gain | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(0.35) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(0.18) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— |
| &nbsp;&nbsp;**Total distributions** | &nbsp;&nbsp;**$(0.07)** | &nbsp;&nbsp;&nbsp;&nbsp;**$(0.45)** | &nbsp;&nbsp;&nbsp;&nbsp;**$(0.39)** | &nbsp;&nbsp;&nbsp;&nbsp;**$(0.23)** | &nbsp;&nbsp;&nbsp;&nbsp;**$(0.23)** | &nbsp;&nbsp;&nbsp;&nbsp;**$(0.20)** |
| &nbsp;&nbsp;**Net increase (decrease) in net asset value** | &nbsp;&nbsp;**$(0.48)** | &nbsp;&nbsp;&nbsp;&nbsp;**$(1.52)** | &nbsp;&nbsp;&nbsp;&nbsp;**$0.16** | &nbsp;&nbsp;&nbsp;&nbsp;**$0.19** | &nbsp;&nbsp;&nbsp;&nbsp;**$0.33** | &nbsp;&nbsp;&nbsp;&nbsp;**$(0.25)** |
| &nbsp;&nbsp;Net asset value, end of period | &nbsp;&nbsp;&nbsp;&nbsp;$8.03 | &nbsp;&nbsp;&nbsp;&nbsp;$8.51 | &nbsp;&nbsp;&nbsp;&nbsp;$10.03 | &nbsp;&nbsp;&nbsp;&nbsp;$9.87 | &nbsp;&nbsp;&nbsp;&nbsp;$9.68 | &nbsp;&nbsp;&nbsp;&nbsp;$9.35 |
| &nbsp;&nbsp;**Total return (b)** | &nbsp;&nbsp;&nbsp;&nbsp;**(4.79)%(c)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(11.16)%** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**5.63%** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**4.38%** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**6.10%** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(0.52)%** |
| &nbsp;&nbsp;Ratio of net expenses to average net assets | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.47%(d) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.43% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.43% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.45% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.52% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.60% |
| &nbsp;&nbsp;Ratio of net investment income (loss) to average net assets | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.86%(d) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.36% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.65% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.96% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.21% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.96% |
| &nbsp;&nbsp;Portfolio turnover rate | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;33%(c) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;72% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;59% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;71% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;52% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;45% |
| &nbsp;&nbsp;Net assets, end of period (in thousands) | $17536 | &nbsp;&nbsp;&nbsp;&nbsp;$21371 | &nbsp;&nbsp;&nbsp;&nbsp;$35295 | &nbsp;&nbsp;&nbsp;&nbsp;$59026 | &nbsp;&nbsp;&nbsp;&nbsp;$62447 | &nbsp;&nbsp;&nbsp;&nbsp;$79308 |

---

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

(b) Assumes
initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period and no sales charges. Total return would be reduced if
sales charges were taken into account.

(c) Not
annualized.

(d) Annualized.

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/22107

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

Financial Highlights (continued)

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
|  | **Six Months<br> Ended<br> 12/31/22<br> (unaudited)** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/22** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/21** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/20** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/19** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/18** |
| &nbsp;&nbsp;**Class K** |  |  |  |  |  |  |
| &nbsp;&nbsp;Net asset value, beginning of period | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$8.60 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$10.13 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$9.98 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$9.78 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$9.45 | &nbsp;&nbsp;&nbsp;&nbsp;$9.71 |
| &nbsp;&nbsp;Increase (decrease) from investment operations: |  |  |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net investment income (loss) (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$0.17 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$0.24 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$0.28 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$0.30 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$0.32 | &nbsp;&nbsp;&nbsp;&nbsp;$0.30 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net realized and unrealized gain (loss) on investments | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(0.53) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1.21) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.37 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.24 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.35 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(0.25) |
| &nbsp;&nbsp;**Net increase (decrease) from investment operations** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(0.36)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(0.97)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$0.65** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$0.54** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$0.67** | &nbsp;&nbsp;&nbsp;&nbsp;**$0.05** |
| &nbsp;&nbsp;Distributions to shareowners: |  |  |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net investment income | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$(0.12) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$(0.21) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$(0.32) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$(0.34) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$(0.34) | &nbsp;&nbsp;&nbsp;&nbsp;$(0.31) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net realized gain | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(0.35) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(0.18) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— |
| &nbsp;&nbsp;**Total distributions** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(0.12)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(0.56)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(0.50)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(0.34)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(0.34)** | &nbsp;&nbsp;&nbsp;&nbsp;**$(0.31)** |
| &nbsp;&nbsp;**Net increase (decrease) in net asset value** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(0.48)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(1.53)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$0.15** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$0.20** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$0.33** | &nbsp;&nbsp;&nbsp;&nbsp;**$(0.26)** |
| &nbsp;&nbsp;Net asset value, end of period | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$8.12 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$8.60 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$10.13 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$9.98 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$9.78 | &nbsp;&nbsp;&nbsp;&nbsp;$9.45 |
| &nbsp;&nbsp;**Total return (b)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(4.20)%(c)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(10.12)%** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**6.66%** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**5.65%** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**7.28%** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**0.54%** |
| &nbsp;&nbsp;Ratio of net expenses to average net assets | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.35%(d) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.33% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.34% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.34% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.37% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.46% |
| &nbsp;&nbsp;Ratio of net investment income (loss) to average net assets | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.01%(d) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.46% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.73% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.08% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.37% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.11% |
| &nbsp;&nbsp;Portfolio turnover rate | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;33%(c) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;72%(e) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;59% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;71% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;52% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;45% |
| &nbsp;&nbsp;Net assets, end of period (in thousands) | $1427926 | &nbsp;&nbsp;&nbsp;&nbsp;$1540983 | &nbsp;&nbsp;&nbsp;&nbsp;$1983399 | &nbsp;&nbsp;&nbsp;&nbsp;$1918556 | &nbsp;&nbsp;&nbsp;&nbsp;$1273821 | &nbsp;&nbsp;&nbsp;&nbsp;$939272 |

---

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

(b) Assumes
initial investment at net asset value at the beginning of each period, reinvestment of all distributions and the complete redemption of the investment at net asset value at the end of each period.

(c) Not
annualized.

(d) Annualized.

(e) Portfolio
turnover excludes the value of portfolio securities received or delivered as a result of in-kind fund share transactions.

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

108Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
|  | **Six Months<br> Ended<br> 12/31/22<br> (unaudited)** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/22** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/21** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/20** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/19** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/18** |
| &nbsp;&nbsp;**Class R** |  |  |  |  |  |  |
| &nbsp;&nbsp;Net asset value, beginning of period | &nbsp;&nbsp;&nbsp;&nbsp;$8.68 | &nbsp;&nbsp;&nbsp;&nbsp;$10.23 | &nbsp;&nbsp;&nbsp;&nbsp;$10.07 | &nbsp;&nbsp;&nbsp;&nbsp;$9.88 | &nbsp;&nbsp;&nbsp;&nbsp;$9.54 | &nbsp;&nbsp;&nbsp;&nbsp;$9.80 |
| &nbsp;&nbsp;Increase (decrease) from investment operations: |  |  |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net investment income (loss) (a) | &nbsp;&nbsp;&nbsp;&nbsp;$0.14 | &nbsp;&nbsp;&nbsp;&nbsp;$0.17 | &nbsp;&nbsp;&nbsp;&nbsp;$0.20 | &nbsp;&nbsp;&nbsp;&nbsp;$0.23 | &nbsp;&nbsp;&nbsp;&nbsp;$0.25 | &nbsp;&nbsp;&nbsp;&nbsp;$0.24 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net realized and unrealized gain (loss) on investments | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(0.53) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1.23) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.39 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.23 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.37 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(0.25) |
| &nbsp;&nbsp;**Net increase (decrease) from investment operations** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(0.39)** | &nbsp;&nbsp;&nbsp;&nbsp;**$(1.06)** | &nbsp;&nbsp;&nbsp;&nbsp;**$0.59** | &nbsp;&nbsp;&nbsp;&nbsp;**$0.46** | &nbsp;&nbsp;&nbsp;&nbsp;**$0.62** | &nbsp;&nbsp;&nbsp;&nbsp;**$(0.01)** |
| &nbsp;&nbsp;Distributions to shareowners: |  |  |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net investment income | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$(0.09) | &nbsp;&nbsp;&nbsp;&nbsp;$(0.14) | &nbsp;&nbsp;&nbsp;&nbsp;$(0.25) | &nbsp;&nbsp;&nbsp;&nbsp;$(0.27) | &nbsp;&nbsp;&nbsp;&nbsp;$(0.28) | &nbsp;&nbsp;&nbsp;&nbsp;$(0.25) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net realized gain | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(0.35) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(0.18) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— |
| &nbsp;&nbsp;**Total distributions** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(0.09)** | &nbsp;&nbsp;&nbsp;&nbsp;**$(0.49)** | &nbsp;&nbsp;&nbsp;&nbsp;**$(0.43)** | &nbsp;&nbsp;&nbsp;&nbsp;**$(0.27)** | &nbsp;&nbsp;&nbsp;&nbsp;**$(0.28)** | &nbsp;&nbsp;&nbsp;&nbsp;**$(0.25)** |
| &nbsp;&nbsp;**Net increase (decrease) in net asset value** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(0.48)** | &nbsp;&nbsp;&nbsp;&nbsp;**$(1.55)** | &nbsp;&nbsp;&nbsp;&nbsp;**$0.16** | &nbsp;&nbsp;&nbsp;&nbsp;**$0.19** | &nbsp;&nbsp;&nbsp;&nbsp;**$0.34** | &nbsp;&nbsp;&nbsp;&nbsp;**$(0.26)** |
| &nbsp;&nbsp;Net asset value, end of period | &nbsp;&nbsp;&nbsp;&nbsp;$8.20 | &nbsp;&nbsp;&nbsp;&nbsp;$8.68 | &nbsp;&nbsp;&nbsp;&nbsp;$10.23 | &nbsp;&nbsp;&nbsp;&nbsp;$10.07 | &nbsp;&nbsp;&nbsp;&nbsp;$9.88 | &nbsp;&nbsp;&nbsp;&nbsp;$9.54 |
| &nbsp;&nbsp;**Total return (b)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(4.51)%(c)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(10.88)%** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**5.97%** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**4.76%** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**6.62%** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(0.08)%** |
| &nbsp;&nbsp;Ratio of net expenses to average net assets | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.10%(d) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.07% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.08% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.08% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.10% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.10% |
| &nbsp;&nbsp;Ratio of net investment income (loss) to average net assets | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.25%(d) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.73% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.99% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.33% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.64% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.46% |
| &nbsp;&nbsp;Portfolio turnover rate | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;33%(c) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;72% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;59% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;71% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;52% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;45% |
| &nbsp;&nbsp;Net assets, end of period (in thousands) | $158951 | &nbsp;&nbsp;&nbsp;&nbsp;$172125 | &nbsp;&nbsp;&nbsp;&nbsp;$212127 | &nbsp;&nbsp;&nbsp;&nbsp;$191311 | &nbsp;&nbsp;&nbsp;&nbsp;$198457 | &nbsp;&nbsp;&nbsp;&nbsp;$179729 |
| &nbsp;&nbsp;Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: |  |  |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total expenses to average net assets | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.10%(d) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.07% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.08% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.08% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.12% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.21% |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net investment income (loss) to average net assets | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.25%(d) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.73% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.99% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.33% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.62% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.35% |

---

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

(b) Assumes
initial investment at net asset value at the beginning of each period, reinvestment of all distributions and the complete redemption of the investment at net asset value at the end of each period.

(c) Not
annualized.

(d) Annualized.

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/22109

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

Financial Highlights (continued)

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
|  | **Six Months<br> Ended<br> 12/31/22<br> (unaudited)** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/22** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/21** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/20** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/19** | &nbsp;&nbsp;&nbsp;&nbsp;**Year <br> Ended<br> 6/30/18** |
| &nbsp;&nbsp;**Class Y** |  |  |  |  |  |  |
| &nbsp;&nbsp;Net asset value, beginning of period | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$8.51 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$10.04 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$9.89 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$9.70 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$9.36 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$9.62 |
| &nbsp;&nbsp;Increase (decrease) from investment operations: |  |  |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net investment income (loss) (a) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$0.16 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$0.22 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$0.26 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$0.29 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$0.31 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$0.28 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net realized and unrealized gain (loss) on investments | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(0.51) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1.20) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.38 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.23 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.36 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(0.24) |
| &nbsp;&nbsp;**Net increase (decrease) from investment operations** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(0.35)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(0.98)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$0.64** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$0.52** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$0.67** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$0.04** |
| &nbsp;&nbsp;Distributions to shareowners: |  |  |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net investment income | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$(0.11) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$(0.20) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$(0.31) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$(0.33) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$(0.33) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$(0.30) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net realized gain | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(0.35) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(0.18) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— |
| &nbsp;&nbsp;**Total distributions** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(0.11)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(0.55)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(0.49)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(0.33)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(0.33)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(0.30)** |
| &nbsp;&nbsp;**Net increase (decrease) in net asset value** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(0.46)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(1.53)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$0.15** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$0.19** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$0.34** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**$(0.26)** |
| &nbsp;&nbsp;Net asset value, end of period | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$8.05 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$8.51 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$10.04 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$9.89 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$9.70 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$9.36 |
| &nbsp;&nbsp;**Total return (b)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(4.07)%(c)** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(10.34)%** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**6.58%** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**5.44%** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**7.30%** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**0.40%** |
| &nbsp;&nbsp;Ratio of net expenses to average net assets | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.48%(d) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.44% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.45% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.45% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.49% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.58% |
| &nbsp;&nbsp;Ratio of net investment income (loss) to average net assets | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.87%(d) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.36% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.62% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.96% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.26% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.98% |
| &nbsp;&nbsp;Portfolio turnover rate | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;33%(c) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;72%(e) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;59% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;71% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;52% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;45% |
| &nbsp;&nbsp;Net assets, end of period (in thousands) | $2016987 | &nbsp;&nbsp;&nbsp;&nbsp;$2230576 | &nbsp;&nbsp;&nbsp;&nbsp;$2795466 | &nbsp;&nbsp;&nbsp;&nbsp;$2847487 | &nbsp;&nbsp;&nbsp;&nbsp;$3053763 | &nbsp;&nbsp;&nbsp;&nbsp;$2708766 |
| &nbsp;&nbsp;Ratios with no waiver of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: |  |  |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total expenses to average net assets | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.48%(d) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.44% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.45% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.45% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.49% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.58% |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Net investment income (loss) to average net assets | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.87%(d) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.36% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.62% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.96% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.26% | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.98% |

---

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

(b) Assumes
initial investment at net asset value at the beginning of each period, reinvestment of all distributions and the complete redemption of the investment at net asset value at the end of each period.

(c) Not
annualized.

(d) Annualized.

(e) Portfolio
turnover excludes the value of portfolio securities received or delivered as a result of in-kind fund share transactions.

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

110Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

### Notes to Financial Statements \| 12/31/22
(unaudited)

1. Organization and Signiﬁcant Accounting Policies

Pioneer Bond Fund (the "Fund") is a Delaware statutory trust. The Fund is registered under the Investment Company Act of 1940, as amended (the "1940 Act") as a diversified, open-end management investment company. The investment objective of the Fund is to seek current income consistent with preservation of capital.

The Fund offers ﬁve classes of shares designated as Class A, Class C, Class K, Class R and Class Y shares. Each class of shares represents an interest in the same portfolio of investments of the Fund and has identical rights (based on relative net asset values) to assets and liquidation proceeds. Share classes can bear different rates of class-speciﬁc fees and expenses, such as transfer agent and distribution fees. Differences in class-speciﬁc fees and expenses will result in differences in net investment income and, therefore, the payment of different dividends from net investment income earned by each class. The Amended and Restated Declaration of Trust of the Fund gives the Board of Trustees the ﬂexibility to specify either per-share voting or dollar-weighted voting when submitting matters for shareowner approval. Under per-share voting, each share of a class of the Fund is entitled to one vote. Under dollar-weighted voting, a shareowner's voting power is determined not by the number of shares owned, but by the dollar value of the shares on the record date. Each share class has exclusive voting rights with respect to matters affecting only that class, including with respect to the distribution plan for that class. There is no distribution plan for Class K or Class Y shares.

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

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/22111

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

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

Effective August 19, 2022, the Fund is required to comply with Rule 18f-4 under the 1940 Act, which governs the use of derivatives by registered investment companies. Rule 18f-4 permits funds to enter into derivatives transactions (as defined in Rule 18f-4) and certain other transactions notwithstanding the restrictions on the issuance of "senior securities" under Section 18 of the 1940 Act. In accordance with Rule 18f-4, the Fund has established and maintains a comprehensive derivatives risk management program, has appointed a derivatives risk manager and complies with a relative or absolute limit on fund leverage risk calculated based on value-at-risk ("VaR").

The Fund is an investment company and follows investment company accounting and reporting guidance under U.S. Generally Accepted Accounting Principles ("U.S. GAAP"). U.S. GAAP requires the management of the Fund to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the ﬁnancial statements, and the reported amounts of income, expenses and gain or loss on investments during the reporting period. Actual results could differ from those estimates.

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

---

| | |
|:---|:---|
| **A.** | **Security Valuation** |
|  | The net asset value of the Fund is computed once daily, on each day the New York Stock Exchange ("NYSE") is open, as of the close of regular trading on the NYSE. |
|  | 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 |

---

112Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| |
|:---|
| are considered to be unreliable, the value of that security may be determined using quotations from one or more broker-dealers. |
| Loan interests are valued at the mean between the last available bid and asked prices from one or more brokers or dealers as obtained from Loan Pricing Corporation, an independent third party pricing service. If price information is not available from Loan Pricing Corporation, or if the price information is deemed to be unreliable, price information will be obtained from an alternative loan interest pricing service. If no reliable price quotes are available from either the primary or alternative pricing service, broker quotes will be solicited. |
| Event-linked bonds are valued at the bid price obtained from an independent third party pricing service. Other insurance-linked securities (including reinsurance sidecars, collateralized reinsurance and industry loss warranties) may be valued at the bid price obtained from an independent pricing service, or through a third party using a pricing matrix, insurance valuation models, or other fair value methods or techniques to provide an estimated value of the instrument. |
| Equity securities that have traded on an exchange are valued by using the last sale price on the principal exchange where they are traded. Equity securities that have not traded on the date of valuation, or securities for which sale prices are not available, generally are valued using the mean between the last bid and asked prices or, if both last bid and asked prices are not available, at the last quoted bid price. Last sale and bid and asked prices are provided by independent third party pricing services. In the case of equity securities not traded on an exchange, prices are typically determined by independent third party pricing services using a variety of techniques and methods. |
| The value of foreign securities is translated into U.S. dollars based on foreign currency exchange rate quotations supplied by a third party pricing source. Trading in non-U.S. equity securities is substantially completed each day at various times prior to the close of the NYSE. The values of such securities used in computing the net asset value of the Fund's shares are determined as of such times. The Adviser may use a fair value model developed by an independent pricing service to value non-U.S. equity securities. |
| Futures contracts are generally valued at the closing settlement price established by the exchange on which they are traded. |
| Swap contracts, including interest rate swaps, caps and floors (other than centrally cleared swap contracts), are valued at the dealer quotations obtained from reputable International Swap Dealers |

---

Pioneer Bond Fund \| Semiannual Report \| 12/31/22113

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | |
|:---|:---|
|  | Association members. Centrally cleared swaps are valued at the daily settlement price provided by the central clearing counterparty. |
|  | Repurchase agreements are valued at par. Cash may include overnight time deposits at approved financial institutions. |
|  | Shares of open-end registered investment companies (including money market mutual funds) are valued at such funds' net asset value. |
|  | Securities or loan interests for which independent pricing services or broker-dealers are unable to supply prices or for which market prices and/or quotations are not readily available or are considered to be unreliable are valued by a fair valuation team comprised of certain personnel of the Adviser. Effective September 8, 2022, the Adviser is designated as the valuation designee for the Fund pursuant to Rule 2a-5 under the 1940 Act. The Adviser's fair valuation team is responsible for monitoring developments that may impact fair valued securities. |
|  | Inputs used when applying fair value methods to value a security may include credit ratings, the financial condition of the company, current market conditions and comparable securities. The Adviser may use fair value methods if it is determined that a significant event has occurred after the close of the exchange or market on which the security trades and prior to the determination of the Fund's net asset value. Examples of a significant event might include political or economic news, corporate restructurings, natural disasters, terrorist activity or trading halts. Thus, the valuation of the Fund's securities may differ significantly from exchange prices, and such differences could be material. |
| **B.** | **Investment Income and Transactions** |
|  | Dividend income is recorded on the ex-dividend date, except that certain dividends from foreign securities where the ex-dividend date may have passed are recorded as soon as the Fund becomes aware of the ex-dividend data in the exercise of reasonable diligence. |
|  | Interest income, including interest on income-bearing cash accounts, is recorded on the accrual basis. Dividend and interest income are reported net of unrecoverable foreign taxes withheld at the applicable country rates and net of income accrued on defaulted securities. |
|  | Interest and dividend income payable by delivery of additional shares is reclassified as PIK (payment-in-kind) income upon receipt and is included in interest and dividend income, respectively. |

---

114Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | |
|:---|:---|
|  | Principal amounts of mortgage-backed securities are adjusted for monthly paydowns. Premiums and discounts related to certain mortgage-backed securities are amortized or accreted in proportion to the monthly paydowns. All discounts/premiums on purchase prices of debt securities are accreted/amortized for financial reporting purposes over the life of the respective securities, and such accretion/amortization is included in interest income. |
|  | Security transactions are recorded as of trade date. Gains and losses on sales of investments are calculated on the identified cost method for both financial reporting and federal income tax purposes. |
| **C.** | **Foreign Currency Translation** |
|  | The books and records of the Fund are maintained in U.S. dollars. Amounts denominated in foreign currencies are translated into U.S. dollars using current exchange rates. |
|  | Net realized gains and losses on foreign currency transactions, if any, represent, among other things, the net realized gains and losses on foreign currency exchange contracts, disposition of foreign currencies and the difference between the amount of income accrued and the U.S. dollars actually received. Further, the effects of changes in foreign currency exchange rates on investments are not segregated on the Statement of Operations from the effects of changes in the market prices of those securities, but are included with the net realized and unrealized gain or loss on investments. |
| **D.** | **Federal Income Taxes** |
|  | It is the Fund's policy to comply with the requirements of the Internal Revenue Code applicable to regulated investment companies and to distribute all of its net taxable income and net realized capital gains, if any, to its shareowners. Therefore, no provision for federal income taxes is required. As of June 30, 2022, the Fund did not accrue any interest or penalties with respect to uncertain tax positions, which, if applicable, would be recorded as an income tax expense on the Statement of Operations. Tax returns filed within the prior three years remain subject to examination by federal and state tax authorities. |
|  | The amount and character of income and capital gain distributions to shareowners are determined in accordance with federal income tax rules, which may differ from U.S. GAAP. Distributions in excess of net investment income or net realized gains are temporary over distributions for financial statement purposes resulting from differences in the recognition or classification of income or distributions for financial |

---

Pioneer Bond Fund \| Semiannual Report \| 12/31/22115

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| |
|:---|
| statement and tax purposes. Capital accounts within the financial statements are adjusted for permanent book/tax differences to reflect tax character, but are not adjusted for temporary differences. |
| The tax character of current year distributions payable will be determined at the end of the current taxable year. The tax character of distributions paid during the year ended June 30, 2022 was as follows: |

---

---

| | |
|:---|:---|
|  | **2022** |
| &nbsp;&nbsp;**Distributions paid from:** |  |
| &nbsp;&nbsp;Ordinary income | $196324519 |
| &nbsp;&nbsp;Long-term capital gains | &nbsp;&nbsp;122147148 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total** | **$318471667** |

---

The following shows the components of distributable earnings (losses) on a federal income tax basis at June 30, 2022:

---

| | |
|:---|:---|
|  | **2022** |
| &nbsp;&nbsp;**Distributable earnings/(losses):** |  |
| &nbsp;&nbsp;Undistributed ordinary income | &nbsp;&nbsp;&nbsp;$20361263 |
| &nbsp;&nbsp;Other book/tax temporary differences | &nbsp;&nbsp;&nbsp;&nbsp;(1035683) |
| &nbsp;&nbsp;Net unrealized depreciation | &nbsp;&nbsp;(408053407) |
| &nbsp;&nbsp;Qualified late year loss deferral | &nbsp;&nbsp;(244912940) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total** | **$(633640767)** |

---

The difference between book basis and tax basis net unrealized depreciation is attributable to the tax deferral of losses on wash sales, adjustments relating to catastrophe bonds, swaps, the tax treatment of premium and amortization and the mark to market of futures contracts.

---

| | |
|:---|:---|
| **E.** | **Fund Shares** |
|  | The Fund records sales and repurchases of its shares as of trade date. The Distributor earned $8,065 in underwriting commissions on the sale of Class A shares during the six months ended December 31, 2022. |
| **F.** | **Class Allocations** |
|  | Income, common expenses and realized and unrealized gains and losses are calculated at the Fund level and allocated daily to each class of shares based on its respective percentage of adjusted net assets at the beginning of the day. |
|  | Distribution fees are calculated based on the average daily net asset value attributable to Class A, Class C and Class R shares of the Fund, respectively (see Note 5). Class K and Class Y shares do not pay distribution fees. All expenses and fees paid to the Fund's transfer agent for its services are allocated among the classes of shares based on the |

---

116Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | |
|:---|:---|
|  | number of accounts in each class and the ratable allocation of related out-of-pocket expenses (see Note 4). |
|  | The Fund declares as daily dividends substantially all of its net investment income. All dividends are paid on a monthly basis. Short-term capital gain distributions, if any, may be declared with the daily dividends. Distributions to shareowners are recorded as of the ex-dividend date. Distributions paid by the Fund with respect to each class of shares are calculated in the same manner and at the same time, except that net investment income dividends to Class A, Class C and Class Y shares can reflect different transfer agent and distribution expense rates. |
| **G.** | **Risks** |
|  | The value of securities held by the Fund may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic, political or regulatory conditions, recessions, the spread of infectious illness or other public health issues, inﬂation, changes in interest rates, armed conflict including Russia's military invasion of Ukraine, sanctions against Russia, other nations or individuals or companies and possible countermeasures, lack of liquidity in the bond markets or adverse investor sentiment. In the past several years, ﬁnancial markets have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. These conditions may continue, recur, worsen or spread. Recently, inflation and interest rates have increased and may rise further. These circumstances could adversely affect the value and liquidity of the Fund's investments, impair the Fund's ability to satisfy redemption requests, and negatively impact the Fund's performance. Raising the ceiling on U.S. government debt has become increasingly politicized. Any failure to increase the ceiling on U.S. government debt could lead to a default on U.S. government obligations, with unpredictable consequences for economies and markets. |
|  | The global pandemic of the novel coronavirus respiratory disease designated COVID-19 has resulted in major disruption to economies and markets around the world, including the United States. Global financial markets have experienced extreme volatility and severe losses, and trading in many instruments has been disrupted. Liquidity for many instruments has been greatly reduced for periods of time. Some sectors of the economy and individual issuers have experienced particularly large losses. These circumstances may continue to affect adversely the value and liquidity of the Fund's investments. Following Russia's invasion of Ukraine, Russian securities have lost all, or nearly all, their |

---

Pioneer Bond Fund \| Semiannual Report \| 12/31/22117

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| |
|:---|
| market value. Other securities or markets could be similarly affected by past or future political, geopolitical or other events or conditions. |
| Governments and central banks, including the U.S. Federal Reserve, have taken extraordinary and unprecedented actions to support local and global economies and the financial markets. These actions have resulted in significant expansion of public debt, including in the U.S. The consequences of high public debt, including its future impact on the economy and securities markets, may not be known for some time. |
| The U.S. and other countries are periodically involved in disputes over trade and other matters, which may result in tariffs, investment restrictions and adverse impacts on affected companies and securities. For example, the U.S. has imposed tariffs and other trade barriers on Chinese exports, has restricted sales of certain categories of goods to China, and has established barriers to investments in China. Trade disputes may adversely affect the economies of the U.S. and its trading partners, as well as companies directly or indirectly affected and financial markets generally. If the political climate between the U.S. and China does not improve or continues to deteriorate, if China were to attempt unification of Taiwan by force, or if other geopolitical conflicts develop or get worse, economies, markets and individual securities may be severely affected both regionally and globally, and the value of the Fund's assets may go down. |
| At times, the Fund's investments may represent industries or industry sectors that are interrelated or have common risks, making the Fund more susceptible to any economic, political, or regulatory developments or other risks affecting those industries and sectors. |
| The Fund's investments in foreign markets and countries with limited developing markets may subject the Fund to a greater degree of risk than investments in a developed market. These risks include disruptive political or economic conditions, military conflicts and sanctions, terrorism, sustained economic downturns, financial instability, less liquid trading markets, extreme price volatility, currency risks, reduction of government or central bank support, inadequate accounting standards, tariffs, tax disputes or other tax burdens, nationalization or expropriation of assets and the imposition of adverse governmental laws, arbitrary application of laws and regulations or lack of rule of law, and investment and repatriation restrictions. Lack of information and less market regulation also may affect the value of these securities. Withholding and other non-U.S. taxes may decrease the Fund's return. Non-U.S. issuers may be located in parts of the world that have historically been prone to natural disasters. Investing in |

---

118Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| |
|:---|
| depositary receipts is subject to many of the same risks as investing directly in non-U.S. issuers. Depositary receipts may involve higher expenses and may trade at a discount (or premium) to the underlying security. |
| Russia launched a large-scale invasion of Ukraine on February 24, 2022. In response to the military action by Russia, various countries, including the U.S., the United Kingdom, and European Union issued broad-ranging economic sanctions against Russia and Belarus and certain companies and individuals. Since then, Russian securities have lost all, or nearly all, their market value, and many other issuers, securities and markets have been adversely affected. The United States and other countries may impose sanctions on other countries, companies and individuals in light of Russia's military invasion. The extent and duration of the impact of existing and future sanctions, market disruptions and volatility, and the result of any diplomatic negotiations cannot be predicted. These and any related events could have a significant impact on the value and liquidity of certain Fund investments, on Fund performance and the value of an investment in the Fund, particularly with respect to securities and commodities, such as oil, natural gas and food commodities, as well as other sectors with exposure to Russian issuers or issuers in other countries affected by the invasion, and are likely to have collateral impacts on market sectors globally. |
| The Fund may invest in REIT securities, the value of which can fall for a variety of reasons, such as declines in rental income, fluctuating interest rates, poor property management, environmental liabilities, uninsured damage, increased competition, or changes in real estate tax laws. |
| The Fund invests in below-investment-grade (high-yield) debt securities and preferred stocks. Some of these high-yield securities may be convertible into equity securities of the issuer. Debt securities rated below investment-grade are commonly referred to as "junk bonds" and are considered speculative with respect to the issuer's capacity to pay interest and repay principal. These securities involve greater risk of loss, are subject to greater price volatility, and may be less liquid and more difficult to value, especially during periods of economic uncertainty or change, than higher rated debt securities. |
| The Fund's investments, payment obligations and financing terms may be based on floating rates, such as LIBOR (London Interbank Offered Rate) or SOFR (Secured Overnight Financing Rate). ICE Benchmark Administration, the administrator of LIBOR, ceased publication of most LIBOR settings on a representative basis at the end of 2021 and is |

---

Pioneer Bond Fund \| Semiannual Report \| 12/31/22119

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| |
|:---|
| expected to cease publication of a majority of U.S. dollar LIBOR settings on a representative basis after June 30, 2023. In addition, global regulators have announced that, with limited exceptions, no new LIBOR-based contracts should be entered into after 2021. Actions by regulators have resulted in the establishment of alternative reference rates to LIBOR in most major currencies. Markets are developing in response to these new rates, but questions around liquidity in these rates and how to appropriately adjust these rates to eliminate any economic value transfer at the time of transition remain a significant concern. The effect of any changes to - or discontinuation of - LIBOR on the Fund will vary depending on, among other things, existing fallback provisions in individual contracts and whether, how, and when industry participants develop and widely adopt new reference rates and fallbacks for both legacy and new products and instruments. The transition process may involve, among other things, increased volatility or illiquidity in markets for instruments that rely on LIBOR. The transition may also result in a reduction in the value of certain LIBOR-based investments held by the Fund or reduce the effectiveness of related transactions such as hedges. Any such effects of the transition away from LIBOR, as well as other unforeseen effects, could result in losses for the Fund. Because the usefulness of LIBOR as a benchmark may deteriorate during the transition period, these effects could occur at any time. |
| With the increased use of technologies such as the Internet to conduct business, the Fund is susceptible to operational, information security and related risks. While the Fund's Adviser has established business continuity plans in the event of, and risk management systems to prevent, limit or mitigate, such cyber-attacks, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identiﬁed. Furthermore, the Fund cannot control the cybersecurity plans and systems put in place by service providers to the Fund such as the Fund's custodian and accounting agent, and the Fund's transfer agent. In addition, many beneﬁcial owners of Fund shares hold them through accounts at broker-dealers, retirement platforms and other ﬁnancial market participants over which neither the Fund nor the Adviser exercises control. Each of these may in turn rely on service providers to them, which are also subject to the risk of cyber-attacks. Cybersecurity failures or breaches at the Adviser or the Fund's service providers or intermediaries have the ability to cause disruptions and impact business operations, potentially resulting in ﬁnancial losses, interference with the Fund's ability to calculate its net asset value, impediments to trading, the inability of Fund shareowners to effect share purchases, redemptions or exchanges or receive distributions, loss of or unauthorized access to private shareowner |

---

120Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | |
|:---|:---|
|  | information and violations of applicable privacy and other laws, regulatory ﬁnes, penalties, reputational damage, or additional compliance costs. Such costs and losses may not be covered under any insurance. In addition, maintaining vigilance against cyber-attacks may involve substantial costs over time, and system enhancements may themselves be subject to cyber-attacks. |
|  | The Fund's prospectus contains unaudited information regarding the Fund's principal risks. Please refer to that document when considering the Fund's principal risks. |
| **H.** | **Restricted Securities** |
|  | Restricted Securities are subject to legal or contractual restrictions on resale. Restricted securities generally are resold in transactions exempt from registration under the Securities Act of 1933. Private placement securities are generally considered to be restricted except for those securities traded between qualiﬁed institutional investors under the provisions of Rule 144A of the Securities Act of 1933. |
|  | Disposal of restricted investments may involve negotiations and expenses, and prompt sale at an acceptable price may be difﬁcult to achieve. Restricted investments held by the Fund at December 31, 2022 are listed in the Schedule of Investments. |
| **I.** | **Insurance-Linked Securities ("ILS")** |
|  | The Fund invests in ILS. The Fund could lose a portion or all of the principal it has invested in an ILS, and the right to additional interest or dividend payments with respect to the security, upon the occurrence of one or more trigger events, as deﬁned within the terms of an insurance-linked security. Trigger events, generally, are hurricanes, earthquakes, or other natural events of a speciﬁc size or magnitude that occur in a designated geographic region during a speciﬁed time period, and/or that involve losses or other metrics that exceed a speciﬁc amount. There is no way to accurately predict whether a trigger event will occur, and accordingly, ILS carry signiﬁcant risk. The Fund is entitled to receive principal, and interest and/or dividend payments so long as no trigger event occurs of the description and magnitude speciﬁed by the instrument. In addition to the speciﬁed trigger events, ILS may expose the Fund to other risks, including but not limited to issuer (credit) default, adverse regulatory or jurisdictional interpretations and adverse tax consequences. |
|  | The Fund's investments in ILS may include event-linked bonds. ILS also may include special purpose vehicles ("SPVs") or similar instruments |

---

Pioneer Bond Fund \| Semiannual Report \| 12/31/22121

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | |
|:---|:---|
|  | structured to comprise a portion of a reinsurer's catastrophe-oriented business, known as quota share instruments (sometimes referred to as reinsurance sidecars), or to provide reinsurance relating to speciﬁc risks to insurance or reinsurance companies through a collateralized instrument, known as collateralized reinsurance. Structured reinsurance investments also may include industry loss warranties ("ILWs"). A traditional ILW takes the form of a bilateral reinsurance contract, but there are also products that take the form of derivatives, collateralized structures, or exchange-traded instruments. |
| **J.** | **Repurchase Agreements** |
|  | Repurchase agreements are arrangements under which the Fund purchases securities from a broker-dealer or a bank, called the counterparty, upon the agreement of the counterparty to repurchase the securities from the Fund at a later date, and at a specific price, which is typically higher than the purchase price paid by the Fund. The securities purchased serve as the Fund's collateral for the obligation of the counterparty to repurchase the securities. The value of the collateral, including accrued interest, is required to be equal to or in excess of the repurchase price. The collateral for all repurchase agreements is held in safekeeping in the customer-only account of the Fund's custodian or a sub-custodian of the Fund. The Adviser is responsible for determining that the value of the collateral remains at least equal to the repurchase price. In the event of a default by the counterparty, the Fund is entitled to sell the securities, but the Fund may not be able to sell them for the price at which they were purchased, thus causing a loss to the Fund. Additionally, if the counterparty becomes insolvent, there is some risk that the Fund will not have a right to the securities, or the immediate right to sell the securities. |
|  | As of and for the six months ended December 31, 2022 the Fund had no open repurchase agreements. |
| **K.** | **Futures Contracts** |
|  | The Fund may enter into futures transactions in order to attempt to hedge against changes in interest rates, securities prices and currency exchange rates or to seek to increase total return. Futures contracts are types of derivatives. |
|  | Subsequent payments for futures contracts ("variation margin") are paid or received by the Fund, depending on the daily fluctuation in the value of the contracts, and are recorded by the Fund as unrealized appreciation or depreciation. Cash received from or paid to the broker related to previous margin movement is held in a segregated account at the broker |

---

122Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| | |
|:---|:---|
|  | and is recorded as either "Due from broker for futures" or "Due to broker for futures" on the Statement of Assets and Liabilities. When the contract is closed, the Fund realizes a gain or loss equal to the difference between the opening and closing value of the contract as well as any fluctuation in foreign currency exchange rates where applicable. Futures contracts are subject to market risk, interest rate risk and currency exchange rate risk. Changes in value of the contracts may not directly correlate to the changes in value of the underlying securities. With futures, there is reduced counterparty credit risk to the Fund since futures are exchange-traded and the exchange's clearinghouse, as counterparty to all exchange-traded futures, guarantees the futures against default. |
|  | The average market value of futures contracts open during the six months ended December 31, 2022 was $559,392,936. Open futures contracts outstanding at December 31, 2022 are listed in the Schedule of Investments. |
| **L.** | **Credit Default Swap Contracts** |
|  | A credit default swap is a contract between a buyer of protection and a seller of protection against a pre-defined credit event or an underlying reference obligation, which may be a single security or a basket or index of securities. The Fund may buy or sell credit default swap contracts to seek to increase the Fund's income, or to attempt to hedge the risk of default on portfolio securities. A credit default swap index is used to hedge risk or take a position on a basket of credit entities or indices. |
|  | As a seller of protection, the Fund would be required to pay the notional (or other agreed-upon) value of the referenced debt obligation to the counterparty in the event of a default by a U.S. or foreign corporate issuer of a debt obligation, which would likely result in a loss to the Fund. In return, the Fund would receive from the counterparty a periodic stream of payments during the term of the contract, provided that no event of default occurred. The maximum exposure of loss to the seller would be the notional value of the credit default swaps outstanding. If no default occurs, the Fund would keep the stream of payments and would have no payment obligation. The Fund may also buy credit default swap contracts in order to hedge against the risk of default of debt securities, in which case the Fund would function as the counterparty referenced above. |
|  | As a buyer of protection, the Fund makes an upfront or periodic payment to the protection seller in exchange for the right to receive a contingent payment. An upfront payment made by the Fund, as the protection buyer, is recorded within the "Swap contracts, at value" line |

---

Pioneer Bond Fund \| Semiannual Report \| 12/31/22123

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| |
|:---|
| item on the Statement of Assets and Liabilities. Periodic payments received or paid by the Fund are recorded as realized gains or losses on the Statement of Operations. |
| Credit default swap contracts are marked-to-market daily using valuations supplied by independent sources, and the change in value, if any, is recorded within the "Swap contracts, at value" line item on the Statement of Assets and Liabilities. Payments received or made as a result of a credit event or upon termination of the contract are recognized, net of the appropriate amount of the upfront payment, as realized gains or losses on the Statement of Operations. |
| Credit default swap contracts involving the sale of protection may involve greater risks than if the Fund had invested in the referenced debt instrument directly. Credit default swap contracts are subject to general market risk, liquidity risk, counterparty risk and credit risk. If the Fund is a protection buyer and no credit event occurs, it will lose its investment. If the Fund is a protection seller and a credit event occurs, the value of the referenced debt instrument received by the Fund, together with the periodic payments received, may be less than the amount the Fund pays to the protection buyer, resulting in a loss to the Fund. In addition, obligations under sell protection credit default swaps may be partially offset by net amounts received from settlement of buy protection credit default swaps entered into by the Fund for the same reference obligation with the same counterparty. |
| The Fund may invest in credit default swap index products ("CDX"). A CDX is a swap on an index of credit default swaps. CDXs allow an investor to manage credit risk or take a position on a basket of credit entities (such as credit default swaps or commercial mortgage-backed securities) in a more efficient manner than transacting in a single-name credit default swap. If a credit event occurs in one of the underlying companies, the protection is paid out via the delivery of the defaulted bond by the buyer of protection in return for a payment of notional value of the defaulted bond by the seller of protection or it may be settled through a cash settlement between the two parties. The underlying company is then removed from the index. If the Fund holds a long position in a CDX, the Fund would indirectly bear its proportionate share of any expenses paid by a CDX. A fund holding a long position in CDXs typically receives income from principal or interest paid on the underlying securities. By investing in CDXs, the Fund could be exposed to liquidity risk, counterparty risk, credit risk of the issuers of the underlying loan obligations and of the CDX markets, and operational risks. If there is a default by the CDX counterparty, the Fund will have contractual remedies pursuant to the agreements related to the |

---

124Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

---

| |
|:---|
| transaction. CDXs also bear the risk that the Fund will not be able to meet its obligation to the counterparty. |
| Certain swap contracts that are cleared through a central clearinghouse are referred to as centrally cleared swaps. All payments made or received by the Fund are pursuant to a centrally cleared swap contract with the central clearing party rather than the original counterparty. Upon entering into a centrally cleared swap contract, the Fund is required to make an initial margin deposit, either in cash or in securities. The daily change in value on open centrally cleared contracts is recorded as "Variation margin for centrally cleared swap contracts" on the Statement of Assets and Liabilities. Cash received from or paid to the broker related to previous margin movement is held in a segregated account at the broker and is recorded as either "Due from broker for swaps" or "Due to broker for swaps" on the Statement of Assets and Liabilities. The amount of cash deposited with a broker as collateral at December 31, 2022 is recorded as "Swaps collateral" on the Statement of Assets and Liabilities. |
| The average notional value of credit default swap contracts buy protection open during the six months ended December 31, 2022 was $564,457,133. Open credit default swap contracts at December 31, 2022 are listed in the Schedule of Investments. |

---

2. Management Agreement

The Adviser manages the Fund's portfolio. Management fees payable under the Fund's Investment Management Agreement with the Adviser are calculated daily and paid monthly at the annual rate of 0.40% of the Fund's average daily net assets up to $500 million, 0.35% of the next $500 million of the Fund's average daily net assets, 0.30% of the next $1 billion of the Fund's average daily net assets, 0.25% of the next $8 billion of the Fund's average daily net assets, and 0.225% of the Fund's average daily net assets over $10 billion. For the six months ended December 31, 2022, the effective management fee (excluding waivers and/or assumption of expenses) was equivalent to 0.29% (annualized) of the Fund's average daily net assets.

In addition, under the management and administration agreements, certain other services and costs, including accounting, regulatory reporting and insurance premiums, are paid by the Fund as administrative reimbursements.

3. Compensation of Officers and Trustees

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/22125

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

compliance officer, the Fund does not pay any salary or other compensation to its officers. The Fund pays a portion of the chief compliance officer's compensation for his services as the Fund's chief compliance officer. Amundi US pays the remaining portion of the chief compliance officer's compensation. For the six months ended December 31, 2022, the Fund paid $132,333 in Officers' and Trustees' compensation, which is reflected on the Statement of Operations as Officers' and Trustees' fees. At December 31, 2022, on its Statement of Assets and Liabilities, the Fund did not have a payable for Trustees' fees and had a payable for administrative expenses of $130,044, which includes the payable for Officers' compensation.

4. Transfer Agent

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

In addition, the Fund reimbursed the transfer agent for out-of-pocket expenses incurred by the transfer agent related to shareowner communications activities such as proxy and statement mailings, and outgoing phone calls. For the six months ended December 31, 2022, such out-of-pocket expenses by class of shares were as follows:

---

| | |
|:---|:---|
| &nbsp;&nbsp;**Shareowner Communications:** |  |
| &nbsp;&nbsp;Class A | &nbsp;&nbsp;$58545 |
| &nbsp;&nbsp;Class C | &nbsp;&nbsp;&nbsp;&nbsp;3164 |
| &nbsp;&nbsp;Class K | &nbsp;&nbsp;&nbsp;&nbsp;53313 |
| &nbsp;&nbsp;Class R | &nbsp;&nbsp;&nbsp;&nbsp;3540 |
| &nbsp;&nbsp;Class Y | &nbsp;&nbsp;&nbsp;&nbsp;66631 |
| &nbsp;&nbsp;&nbsp;&nbsp;**Total** | **$185193** |

---

5. Distribution and Service Plans

The Fund has adopted a distribution plan (the "Plan") pursuant to Rule 12b-1 under the 1940 Act with respect to its Class A, Class C and Class R shares. Pursuant to the Plan, the Fund pays the Distributor 0.25% of the Fund's average daily net assets attributable to Class A shares as compensation for personal services and/or account maintenance services or distribution services with regard to Class A shares. Pursuant to the Plan, the Fund also pays the Distributor 1.00% of the average daily net assets attributable to Class C shares. The fee for Class C shares consists of a 0.25% service fee and a 0.75% distribution fee paid as compensation for personal services and/or account maintenance services or distribution services with regard to Class C shares. Pursuant to the Plan, the Fund

126Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

further pays the Distributor 0.50% of the average daily net assets attributable to Class R shares for distribution services.

The Fund also has adopted a separate service plan for Class R shares (the "Service Plan"). The Service Plan authorizes the Fund to pay securities dealers, plan administrators or other service organizations that agree to provide certain services to retirement plans or plan participants holding shares of the Fund a service fee of up to 0.25% of the Fund's average daily net assets attributable to Class R shares held by such plans.

In addition, redemptions of Class A and Class C shares may be subject to a contingent deferred sales charge ("CDSC"). A CDSC of 1.00% may be imposed on redemptions of certain net asset value purchases of Class A shares within 12 months of purchase. Redemptions of Class C shares within 12 months of purchase are subject to a CDSC of 1.00% based on the lower of cost or market value of shares being redeemed. Shares purchased as part of an exchange remain subject to any CDSC that applied to the original purchase of those shares. There is no CDSC for Class K, Class R or Class Y shares. Proceeds from the CDSCs are paid to the Distributor. For the six months ended December 31, 2022, CDSCs in the amount of $4,859 were paid to the Distributor.

6. Line of Credit Facility

The Fund, along with certain other funds in the Pioneer Family of Funds, participates in a committed, unsecured revolving line of credit ("credit facility"). Borrowings are used solely for temporary or emergency purposes. The Fund may borrow up to the lesser of the amount available under the credit facility or the limits set for borrowing by the Fund's prospectus and the 1940 Act. The Fund participates in a credit facility in the amount of $380 million. Under such credit facility, depending on the type of loan, interest on borrowings is payable at the London Interbank Offered Rate ("LIBOR") plus a credit spread. The Fund also pays both an upfront fee and an annual commitment fee to participate in the credit facility. The upfront fee in the amount of 0.10% of the total credit facility and the commitment fee in the amount of 0.25% of the daily unused portion of each lender's commitment are allocated among participating funds based on an allocation schedule set forth in the credit agreement. For the six months ended December 31, 2022, the Fund had no borrowings under the credit facility.

7. Additional Disclosures about Derivative Instruments and Hedging Activities

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

Pioneer Bond Fund \| Semiannual Report \| 12/31/22127

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

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

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

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

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

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

The fair value of open derivative instruments (not considered to be hedging instruments for accounting disclosure purposes) by risk exposure at December 31, 2022, was as follows:

---

| | | | | | |
|:---|:---|:---|:---|:---|:---|
| &nbsp;&nbsp;**Statement of Assets<br> and Liabilities** | **Interest <br> Rate Risk** | **Credit <br> Risk** | **Foreign <br> Exchange<br> Rate Risk** | **Equity <br> Risk** | &nbsp;&nbsp;**Commodity <br> Risk** |
| &nbsp;&nbsp;**Liabilities** |  |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Net unrealized depreciation on futures contracts\* | $1611315 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$— | $— | $— | &nbsp;&nbsp;$— |
| &nbsp;&nbsp;&nbsp;&nbsp;Swap contracts, at value | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;4259204 | &nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;— |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Value** | **$1611315** | **$4259204** | **$—** | **$—** | &nbsp;&nbsp;**$—** |

---

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

128Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

The effect of derivative instruments (not considered to be hedging instruments for accounting disclosure purposes) on the Statement of Operations by risk exposure at December 31, 2022 was as follows:

---

| | | | | | |
|:---|:---|:---|:---|:---|:---|
| &nbsp;&nbsp;**Statement of Operations** | **Interest <br> Rate Risk** | **Credit <br> Risk** | **Foreign <br> Exchange<br> Rate Risk** | **Equity <br> Risk** | **Commodity <br> Risk** |
| &nbsp;&nbsp;**Net Realized Gain (Loss) on** |  |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Futures contracts | $(53023418) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$— | $— | $— | $— |
| &nbsp;&nbsp;&nbsp;&nbsp;Swap contracts | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;&nbsp;(1351403) | &nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;— |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Value** | **$(53023418)** | &nbsp;&nbsp;**$(1351403)** | **$—** | **$—** | **$—** |
| &nbsp;&nbsp;**Change in Net Unrealized Appreciation (Depreciation) on** |  |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;Futures contracts | &nbsp;&nbsp;&nbsp;$5821035 | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$— | $— | $— | $— |
| &nbsp;&nbsp;&nbsp;&nbsp;Swap contracts | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;(43146738) | &nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;— | &nbsp;&nbsp;&nbsp;— |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Value** | &nbsp;&nbsp;&nbsp;**$5821035** | **$(43146738)** | **$—** | **$—** | **$—** |

---

8. In-Kind Redemption

In accordance with guidelines described in a Fund's prospectus and in accordance with procedures adopted by the Board, a Fund may distribute portfolio securities rather than cash as payment for a redemption of Fund shares ("in-kind redemption"). For financial reporting purposes, the Fund recognizes gains and losses on in-kind redemptions to the extent the value of the distributed securities on the date of redemption exceeds the cost of those securities. Gains and losses realized on in-kind redemptions are not recognized for tax purposes and are reclassified from undistributed realized gain/(loss) to paid-in capital. During the six months ended December 31, 2022, the Fund did not record any redemptions in-kind. For the year ended June 30, 2022, the Fund recorded a redemption in-kind of portfolio securities and cash that was valued at $435,749,235. The redeeming shareholder received a pro-rata share of the securities held by the Fund in the in-kind redemption. The distribution of such securities generated a realized gain of $24,092,752 for the Fund.

Pioneer Bond Fund \| Semiannual Report \| 12/31/22129

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

### Approval of Renewal of Investment Management Agreement
Amundi Asset Management US, Inc. ("Amundi US") serves as the investment adviser to Pioneer Bond Fund (the "Fund") pursuant to an investment management agreement between Amundi US and the Fund. In order for Amundi US to remain the investment adviser of the Fund, the Trustees of the Fund, including a majority of the Fund's Independent Trustees, must determine annually whether to renew the investment management agreement for the Fund.

The contract review process began in January 2022 as the Trustees of the Fund agreed on, among other things, an overall approach and timeline for the process. Contract review materials were provided to the Trustees in March 2022, July 2022 and September 2022. In addition, the Trustees reviewed and discussed the Fund's performance at regularly scheduled meetings throughout the year, and took into account other information related to the Fund provided to the Trustees at regularly scheduled meetings, in connection with the review of the Fund's investment management agreement.

In March 2022, the Trustees, among other things, discussed the memorandum provided by Fund counsel that summarized the legal standards and other considerations that are relevant to the Trustees in their deliberations regarding the renewal of the investment management agreement, and reviewed and discussed the qualifications of the investment management teams for the Fund, as well as the level of investment by the Fund's portfolio managers in the Fund. In July 2022, the Trustees, among other things, reviewed the Fund's management fees and total expense ratios, the financial statements of Amundi US and its parent companies, profitability analyses provided by Amundi US, and analyses from Amundi US as to possible economies of scale. The Trustees also reviewed the profitability of the institutional business of Amundi US, as compared to that of Amundi US's fund management business, and considered the differences between the fees and expenses of the Fund and the fees and expenses of Amundi US's institutional accounts, as well as the different services provided by Amundi US to the Fund and to the institutional accounts. The Trustees further considered contract review materials, including additional materials received in response to the Trustees' request, in September 2022.

At a meeting held on September 20, 2022, based on their evaluation of the information provided by Amundi US and third parties, the Trustees of the Fund, including the Independent Trustees voting separately advised by independent counsel, unanimously approved the renewal of the investment

130Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

management agreement for another year. In approving the renewal of the investment management agreement, the Trustees considered various factors that they determined were relevant, including the factors described below. The Trustees did not identify any single factor as the controlling factor in determining to approve the renewal of the agreement.

#### Nature, Extent and Quality of Services.
The Trustees considered the nature, extent and quality of the services that had been provided by Amundi US to the Fund, taking into account the investment objective and strategy of the Fund. The Trustees also reviewed Amundi US's investment approach for the Fund and its research process. The Trustees considered the resources of Amundi US and the personnel of Amundi US who provide investment management services to the Fund. They also reviewed the amount of non-Fund assets managed by the portfolio managers of the Fund. They considered the non-investment resources and personnel of Amundi US that are involved in Amundi US's services to the Fund, including Amundi US's compliance, risk management, and legal resources and personnel. The Trustees noted the substantial attention and high priority given by Amundi US's senior management to the Pioneer Fund complex, including with respect to the increasing regulation to which the Pioneer Funds are subject. The Trustees considered the effectiveness of Amundi US's business continuity plan in response to the ongoing COVID-19 pandemic.

The Trustees considered that Amundi US supervises and monitors the performance of the Fund's service providers and provides the Fund with personnel (including Fund officers) and other resources that are necessary for the Fund's business management and operations. The Trustees also considered that, as administrator, Amundi US is responsible for the administration of the Fund's business and other affairs. The Trustees considered that the Fund reimburses Amundi US its pro rata share of Amundi US's costs of providing administration services to the Pioneer Funds.

Based on these considerations, the Trustees concluded that the nature, extent and quality of services that had been provided by Amundi US to the Fund were satisfactory and consistent with the terms of the investment management agreement.

#### Performance of the Fund.
In considering the Fund's performance, the Trustees regularly review and discuss throughout the year data prepared by Amundi US and information comparing the Fund's performance with the performance of its peer group of funds, as classified by Morningstar, Inc. (Morningstar), and with the

Pioneer Bond Fund \| Semiannual Report \| 12/31/22131

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

performance of the Fund's benchmark index. They also discuss the Fund's performance with Amundi US on a regular basis. The Trustees' regular reviews and discussions were factored into the Trustees' deliberations concerning the renewal of the investment management agreement.

#### Management Fee and Expenses.
The Trustees considered information showing the fees and expenses of the Fund in comparison to the management fees of its peer group of funds as classified by Morningstar and also to the expense ratios of a peer group of funds selected on the basis of criteria determined by the Independent Trustees for this purpose using data provided by Strategic Insight Mutual Fund Research and Consulting, LLC (Strategic Insight), an independent third party. The peer group comparisons referred to below are organized in quintiles. Each quintile represents one-fifth of the peer group. In all peer group comparisons referred to below, first quintile is most favorable to the Fund's shareowners. The Trustees noted that they separately review and consider the impact of the Fund's transfer agency and Fund- and Amundi US-paid expenses for sub-transfer agency and intermediary arrangements, and that the results of the most recent such review were considered in the consideration of the Fund's expense ratio.

The Trustees considered that the Fund's management fee for the most recent fiscal year was in the first quintile relative to the management fees paid by other funds in its Morningstar category for the comparable period. The Trustees also considered the breakpoints in the management fee schedule and the reduced fee rates above certain asset levels. The Trustees considered that the expense ratio of the Fund's Class Y shares for the most recent fiscal year was in the second quintile relative to its Strategic Insight peer group for the comparable period.

The Trustees reviewed management fees charged by Amundi US to institutional and other clients, including publicly offered European funds sponsored by Amundi US's affiliates, unaffiliated U.S. registered investment companies (in a sub-advisory capacity), and unaffiliated foreign and domestic separate accounts. The Trustees also considered Amundi US's costs in providing services to the Fund and Amundi US's costs in providing services to the other clients and considered the differences in management fees and profit margins for fund and non-fund services. In evaluating the fees associated with Amundi US's client accounts, the Trustees took into account the respective demands, resources and complexity associated with the Fund and other client accounts. The Trustees noted that, in some instances, the fee rates for those clients were lower than the management fee for the Fund and considered that, under the investment management and administration agreements with the Fund, Amundi US performs

132Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

additional services for the Fund that it does not provide to those other clients or services that are broader in scope, including oversight of the Fund's other service providers and activities related to compliance and the extensive regulatory and tax regimes to which the Fund is subject. The Trustees also considered the entrepreneurial risks associated with Amundi US's management of the Fund.

The Trustees concluded that the management fee payable by the Fund to Amundi US was reasonable in relation to the nature and quality of the services provided by Amundi US.

#### Profitability.
The Trustees considered information provided by Amundi US regarding the profitability of Amundi US with respect to the advisory services provided by Amundi US to the Fund, including the methodology used by Amundi US in allocating certain of its costs to the management of the Fund. The Trustees also considered Amundi US's profit margin in connection with the overall operation of the Fund. They further reviewed the financial results, including the profit margins, realized by Amundi US from non-fund businesses. The Trustees considered Amundi US's profit margins in comparison to the limited industry data available and noted that the profitability of any adviser was affected by numerous factors, including its organizational structure and method for allocating expenses. The Trustees concluded that Amundi US's profitability with respect to the management of the Fund was not unreasonable.

#### Economies of Scale.
The Trustees considered Amundi US's views relating to economies of scale in connection with the Pioneer Funds as fund assets grow and the extent to which any such economies of scale are shared with the Fund and Fund shareholders. The Trustees noted the breakpoints in the management fee schedule. The Trustees recognize that economies of scale are difficult to identify and quantify, and that, among other factors that may be relevant, are the following: fee levels, expense subsidization, investment by Amundi US in research and analytical capabilities and Amundi US's commitment and resource allocation to the Fund. The Trustees noted that profitability also may be an indicator of the availability of any economies of scale, although profitability may vary for other reasons including due to reductions in expenses. The Trustees concluded that economies of scale, if any, were being appropriately shared with the Fund.

Pioneer Bond Fund \| Semiannual Report \| 12/31/22133

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

#### Other Benefits.
The Trustees considered the other benefits that Amundi US enjoys from its relationship with the Fund. The Trustees considered the character and amount of fees paid or to be paid by the Fund, other than under the investment management agreement, for services provided by Amundi US and its affiliates. The Trustees further considered the revenues and profitability of Amundi US's businesses other than the Fund business. To the extent applicable, the Trustees also considered the benefits to the Fund and to Amundi US and its affiliates from the use of "soft" commission dollars generated by the Fund to pay for research and brokerage services.

The Trustees considered that Amundi US is the principal U.S. asset management business of Amundi, which is one of the largest asset managers globally. Amundi's worldwide asset management business manages over $2.2 trillion in assets (including the Pioneer Funds). The Trustees considered that Amundi US's relationship with Amundi creates potential opportunities for Amundi US and Amundi that derive from Amundi US's relationships with the Fund, including Amundi's ability to market the services of Amundi US globally. The Trustees noted that Amundi US has access to additional research and portfolio management capabilities as a result of its relationship with Amundi and Amundi's enhanced global presence that may contribute to an increase in the resources available to Amundi US. The Trustees considered that Amundi US and the Fund receive reciprocal intangible benefits from the relationship, including mutual brand recognition and, for the Fund, direct and indirect access to the resources of a large global asset manager. The Trustees concluded that any such benefits received by Amundi US as a result of its relationship with the Fund were reasonable.

#### Conclusion.
After consideration of the factors described above as well as other factors, the Trustees, including the Independent Trustees, concluded that the investment management agreement for the Fund, including the fees payable thereunder, was fair and reasonable and voted to approve the proposed renewal of the investment management agreement.

134Pioneer Bond Fund \| Semiannual Report \| 12/31/22

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

Trustees, Officers and Service Providers

#### Trustees
Thomas J. Perna, Chairman

John E. Baumgardner, Jr.

Diane Durnin

Benjamin M. Friedman

Lisa M. Jones

Craig C. MacKay

Lorraine H. Monchak

Marguerite A. Piret

Fred J. Ricciardi

Kenneth J. Taubes

#### Officers
Lisa M. Jones, President and<br> Chief Executive Officer

Anthony J. Koenig, Jr., Treasurer<br> and Chief Financial and<br> Accounting Officer

Christopher J. Kelley, Secretary and<br> Chief Legal Officer

#### Investment Adviser and Administrator<br> Amundi Asset Management US, Inc.

#### Custodian and Sub-Administrator<br> The Bank of New York Mellon Corporation

#### Independent Registered Public Accounting Firm<br> Ernst & Young LLP

#### Principal Underwriter<br> Amundi Distributor US, Inc.

#### Legal Counsel<br> Morgan, Lewis & Bockius LLP

#### Transfer Agent<br> BNY Mellon Investment Servicing (US) Inc.
**Proxy Voting Policies and Procedures of the Fund are available without charge, upon request, by calling our toll free number (1-800-225-6292). Information regarding how the Fund voted proxies relating to portfolio securities during the most recent 12-month period ended June 30 is publicly available to shareowners at www.amundi.com/us. This information is also available on the Securities and Exchange Commission's web site at www.sec.gov.**

Pioneer Bond Fund \| Semiannual Report \| 12/31/22135

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

### How to Contact Amundi

#### We are pleased to offer a variety of convenient ways for you to contact us for assistance or information.

#### Call us for:

------

#### Account Information, including existing accounts,<br> new accounts, prospectuses, applications<br> and service forms

#### 1-800-225-6292

#### FactFone<sup>SM</sup> for automated fund yields, prices,<br> account information and transactions

#### 1-800-225-4321

---

| | |
|:---|:---|
| **Retirement plans information** | **1-800-622-0176** |

---

#### Write to us:

------

Amundi<br> P.O. Box 9897<br> Providence, RI 02940-8097

---

| | |
|:---|:---|
| **Our toll-free fax** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**1-800-225-4240** |
| **Our internet e-mail address** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **us.askamundi@amundi.com<br> (for general questions about Amundi only)** |

---

#### Visit our web site: www.amundi.com/us
This report must be preceded or accompanied by a prospectus.

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

------

[**Table of Contents**](#job_amund_1443d49f-fa6b-4fe1-8238-16edab3ef73b_toc)

![](g470498img99bde61b1.gif)

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

#### www.amundi.com/us
Securities offered through Amundi Distributor US, Inc.<br> 60 State Street, Boston, MA 02109<br> Underwriter of Pioneer Mutual Funds, Member SIPC<br>© 2023 Amundi Asset Management US, Inc. 18633-17-0223

------

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:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) Honest and ethical conduct, including the ethical handling of actual or apparent conflicts of interest between personal and professional relationships;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(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;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3) Compliance with applicable governmental laws, rules, and regulations;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(4) The prompt internal reporting of violations of the code to an appropriate person or persons identified in the code; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(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:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(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);

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(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

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(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:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) Has at least one audit committee financial expert serving on its audit committee; or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(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.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(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:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) Accept directly or indirectly any consulting, advisory, or other compensatory fee from the issuer; or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(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.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(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.

N/A

(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.

N/A

(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 Fund paid aggregate non-audit fees to Ernst & Young LLP for tax services of $8,803 and $8,189 during the fiscal years ended December 31, 2022 and 2021, 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.

N/A

(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<br>SUBCATEGORIES |
| I. AUDIT SERVICES | Services that are directly related to performing the independent audit of the Funds | • Accounting research assistance<br> • SEC consultation, registration statements, and reporting<br> • Tax accrual related matters<br> • Implementation of new accounting standards<br> • Compliance letters (e.g. rating agency letters)<br> • Regulatory reviews and assistance regarding financial matters<br> • Semi-annual reviews (if requested)<br> • Comfort letters for closed end offerings |
| II. AUDIT-RELATED SERVICES | Services which are not prohibited under Rule<br>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.) | • AICPA attest and agreed-upon procedures<br> • Technology control assessments<br> • Financial reporting control assessments<br> • Enterprise security architecture assessment |

---

---

| | |
|:---|:---|
| AUDIT COMMITTEE APPROVAL POLICY | AUDIT COMMITTEE REPORTING POLICY |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• "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. |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• "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. |

---

------

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• 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)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• 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"<br>

------

SECTION III - POLICY DETAIL, CONTINUED

---

| | | |
|:---|:---|:---|
| SERVICE CATEGORY | SERVICE CATEGORY DESCRIPTION | SPECIFIC PRE-APPROVED SERVICE<br>SUBCATEGORIES |
| III. TAX SERVICES | 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, or the ability to maintain a desired level of confidentiality. | • Tax planning and support<br> • Tax controversy assistance<br> • Tax compliance, tax returns, excise tax returns and support<br> • 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<br>SUBCATEGORIES |
| IV. OTHER SERVICES<br>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<br> • 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<br>• 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)<br>• 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" | • A summary of all such services and related fees (including comparison to specified dollar limits) reported quarterly. |

---

------

SECTION III - POLICY DETAIL, CONTINUED

---

| | | |
|:---|:---|:---|
| SERVICE CATEGORY | SERVICE CATEGORY DESCRIPTION | SPECIFIC PROHIBITED SERVICE SUBCATEGORIES |
| PROHIBITED SERVICES | Services which result 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\*<br> 2. Financial information systems design and implementation\*<br> 3. Appraisal or valuation services, fairness\* opinions, or contribution-in-kind reports<br> 4. Actuarial services (i.e., setting actuarial reserves versus actuarial audit work)\*<br> 5. Internal audit outsourcing services\*<br> 6. Management functions or human resources<br> 7. Broker or dealer, investment advisor, or investment banking services<br> 8. Legal services and expert services unrelated to the audit<br> 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.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(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

N/A

(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.

N/A

(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.

------

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.](d470498dex99codeeth.htm)

[(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.](d470498dex99cert.htm)

[(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.](d470498dex99906cert.htm)

------

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 Bond Fund

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

Lisa M. Jones, President and Chief Executive Officer

Date March 8, 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 March 8, 2023

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

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

Date March 8, 2023

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

## Ex-99.Code

**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:

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

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• 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;

1 Last revised January 2021

------

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

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

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• 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.

2 Last revised January 2021

------

Each Senior Officer must:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• 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;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• 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

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• 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:

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

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• 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;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• 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;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• 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

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• 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.

3 Last revised January 2021

------

**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.

4 Last revised January 2021

------

**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 Bond Fund;

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:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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):

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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: March 8, 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 Bond Fund;

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:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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):

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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: March 8, 2023 |
| /s/ Anthony J. Koenig, Jr. |
|  Anthony J. Koenig, Jr. |

---

Managing Director, Chief Operations Officer & Treasurer of the Funds

## Exhibit 99.906

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 Bond Fund 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 Fund.

Date: March 8, 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 Fund and will be retained by the Fund 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 Bond Fund 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 Fund.

Date: March 8, 2023

/s/ Anthony J. Koenig, Jr.<br> Anthony J. Koenig, Jr.<br>

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 Fund and will be retained by the Fund and furnished to the Securities Exchange Commission or its staff upon request.