# EDGAR Filing Document

**Accession Number:** 0001258943
**File Stem:** 0001683863-25-005640
**Filing Date:** 2025-7
**Character Count:** 12260
**Document Hash:** 95d5b545d41a91e7371da910f151c320
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001683863-25-005640.hdr.sgml**: 20250709

**ACCESSION NUMBER**: 0001683863-25-005640

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20250709

**DATE AS OF CHANGE**: 20250709

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** PIONEER HIGH INCOME FUND, INC.
- **CENTRAL INDEX KEY:** 0001166258

**ORGANIZATION NAME:**
- **EIN:** 020563892
- **STATE OF INCORPORATION:** MD
- **FISCAL YEAR END:** 0331

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 811-21043
- **FILM NUMBER:** 251113075

**BUSINESS ADDRESS:**
- **STREET 1:** 60 STATE ST.
- **STREET 2:** 5TH FL.
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02109
- **BUSINESS PHONE:** 617-742-7825

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

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** PIONEER HIGH INCOME TRUST
- **DATE OF NAME CHANGE:** 20020129
**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Pioneer Municipal High Income Opportunities Fund, Inc.
- **CENTRAL INDEX KEY:** 0001864290

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** MD
- **FISCAL YEAR END:** 0430

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 811-23699
- **FILM NUMBER:** 251113080

**BUSINESS ADDRESS:**
- **STREET 1:** 60 STATE STREET
- **STREET 2:** 5TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02109
- **BUSINESS PHONE:** 617-742-7825

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

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Pioneer Floating Rate Fund, Inc.
- **CENTRAL INDEX KEY:** 0001305767

**ORGANIZATION NAME:**
- **EIN:** 582683903
- **STATE OF INCORPORATION:** MD
- **FISCAL YEAR END:** 1130

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 811-21654
- **FILM NUMBER:** 251113077

**BUSINESS ADDRESS:**
- **STREET 1:** 60 STATE STREET
- **STREET 2:** 5TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02109
- **BUSINESS PHONE:** 617-742-7825

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

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Pioneer Floating Rate Trust
- **DATE OF NAME CHANGE:** 20041013
**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Pioneer Diversified High Income Fund, Inc.
- **CENTRAL INDEX KEY:** 0001388126

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** MD
- **FISCAL YEAR END:** 0430

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 811-22014
- **FILM NUMBER:** 251113076

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

**MAIL ADDRESS:**
- **STREET 1:** 60 STATE STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02109

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Pioneer Diversified High Income Trust
- **DATE OF NAME CHANGE:** 20070130

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Pioneer Diversified Income Opportunity Trust
- **DATE OF NAME CHANGE:** 20070129
**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** PIONEER MUNICIPAL HIGH INCOME FUND, INC.
- **CENTRAL INDEX KEY:** 0001223026

**ORGANIZATION NAME:**
- **EIN:** 030512430
- **STATE OF INCORPORATION:** MD
- **FISCAL YEAR END:** 0430

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 811-21321
- **FILM NUMBER:** 251113078

**BUSINESS ADDRESS:**
- **STREET 1:** 60 STATE STREET
- **STREET 2:** 5TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02109
- **BUSINESS PHONE:** 617-742-7825

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

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** PIONEER MUNICIPAL HIGH INCOME TRUST
- **DATE OF NAME CHANGE:** 20030314
**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** PIONEER MUNICIPAL HIGH INCOME ADVANTAGE FUND, INC.
- **CENTRAL INDEX KEY:** 0001258943

**ORGANIZATION NAME:**
- **EIN:** 810634319
- **STATE OF INCORPORATION:** MD
- **FISCAL YEAR END:** 0331

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 811-21409
- **FILM NUMBER:** 251113079

**BUSINESS ADDRESS:**
- **STREET 1:** 60 STATE STREET
- **STREET 2:** 5TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02109
- **BUSINESS PHONE:** 617-742-7825

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

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** PIONEER MUNICIPAL HIGH INCOME ADVANTAGE TRUST
- **DATE OF NAME CHANGE:** 20030926

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** PIONEER MUNICIPAL ADVANTAGE TRUST
- **DATE OF NAME CHANGE:** 20030807

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

**SCHEDULE 14A**

Proxy Statement Pursuant to Section 14(a) of the Securities

Exchange Act of 1934

Filed by the Registrant [X]

Filed by a Party other than the Registrant [ ]

Check the appropriate box:

[ ] Preliminary Proxy Statement <br> [ ] Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) <br> [ ] Definitive Proxy Statement

[X]Definitive Additional Materials

[ ] Soliciting Material Pursuant to §240.14a-12

**PIONEER DIVERSIFIED HIGH INCOME FUND, INC. (HNW)**

**PIONEER FLOATING RATE FUND, INC. (PHD)**

**PIONEER HIGH INCOME FUND, INC. (PHT)**

**PIONEER MUNICIPAL HIGH INCOME FUND, INC. (MHI)**

**PIONEER MUNICIPAL HIGH INCOME ADVANTAGE FUND, INC. (MAV)**

**PIONEER MUNICIPAL HIGH INCOME OPPORTUNITIES FUND, INC. (MIO)**

(Name of Registrant(s) as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

[X]No fee required.

---

| | | |
|:---|:---|:---|
| [] | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11. |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Title of each class of securities to which transaction applies: |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Aggregate number of securities to which transaction applies: |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0- |
|  |  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11 (set forth the amount on which the filing fee is calculated and state how it was determined): |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4) | Proposed maximum aggregate value of transaction: |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5) | Total fee paid: |
| [] | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Fee paid previously with preliminary materials. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Fee paid previously with preliminary materials. |
| [] | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;for which the offsetting fee was paid previously. Identify the previous filing by registration statement | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;for which the offsetting fee was paid previously. Identify the previous filing by registration statement |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;number, or the Form or Schedule and the date of its filing. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;number, or the Form or Schedule and the date of its filing. |

---

1)Amount Previously Paid:

2)Form, Schedule or Registration Statement No.:

3)Filing Party:

4)Date Filed:© 2025 SEI 2

![](g5ckwp4e82z1yvek4c41g.jpg)

A MESSAGE FROM VICTORY CAPITAL MANAGEMENT

**WE NEED YOUR HELP.**

Dear Valued Stockholder,

Thank you for being an investor in the Pioneer Closed-End Funds. A special meeting of stockholders of each of **Pioneer**

**Diversified High Income Fund, Inc. (HNW), Pioneer Floating Rate Fund, Inc. (PHD), Pioneer High Income Fund, Inc. (PHT), Pioneer Municipal High Income Fund, Inc. (MHI), Pioneer Municipal High Income Advantage Fund, Inc. (MAV) and Pioneer Municipal High Income Opportunities Fund, Inc. (MIO) (each, a "Fund" and, collectively, the "Funds"), will be held on July 17, 2025. If you have not yet cast your important proxy vote, please help us by taking a moment to do so today. Your participation today will help us to avoid adjourning the meeting, or the expense of additional follow-up letters or phone calls. Please help us to proceed with the important business of the Funds by casting your vote today so that your shares may be represented at the meeting.**

**PLEASE HELP US BY CASTING YOUR VOTE TODAY.**

Stockholders of the Funds are being asked to consider and vote on the liquidation and dissolution of your Fund pursuant to the Plan of Liquidation and Dissolution adopted by the Boards of Directors of the Funds (the "Board") (the "Proposal").

The Proposal has unanimously been determined by the Board to be in the best interests of the respective Funds and the Board recommends that stockholders of each Fund vote "FOR" the respective Fund proposal. The proposal is discussed in detail in the proxy materials previously sent to you. That information can be accessed at **<u>https://vote.proxyonline.com/pioneer/docs/2025proxy.pdf</u>** or by scanning the QR code below with your mobile phone.

If you have any proxy related questions, **please call (800) 622-1569 for assistance**. Representatives are available Monday through Friday, 9 a.m. to 10 p.m. Eastern Time. If we do not hear back from you soon, we may need to follow-up with you again by mail or by phone. Please help us to proceed with the important business of the Funds by voting today.

Sincerely,

Thomas Dusenberry

President

You may view a PDF of the proxy statement by scanning this QR code.

**HOW DO I VOTE? There are three convenient methods for casting your important proxy vote:**

**Vote by touch-tone phone:** You may cast your vote by telephone using an automated system by calling the toll-free number found on the enclosed proxy card(s).

**Vote online:** You may cast your vote by visiting the web address located on the enclosed proxy card(s) and following the instructions on the website.

**Vote by mail:** You may cast your vote by signing, dating, and mailing the enclosed proxy card(s) in the postage-prepaid return envelope provided.© 2025 SEI 3

![](g9i57nrryod6udunvdxvh.jpg)

Shareholder Name

Address 1

Address 2

Address 3

City, State, Zip

**IMPORTANT NOTICE – PLEASE CALL US TODAY**

Dear Stockholder:

We have been trying to contact you about an important matter regarding your investment in **[Fund Name]**, and we need your assistance. Please contact us toll-free at **(800) 622-1569** between 9 a.m. and 11 p.m. Eastern time, Monday through Friday or Saturday between 10 a.m. and 6 p.m. Eastern time. At the time of the call, <u>please reference your investor ID listed below.</u>

---

| | | |
|:---|:---|:---|
| **INVESTOR ID:** | &nbsp;&nbsp;**xxxxxxxxx** | Security ID: xxxxxxxxx |
| Shares owned: | &nbsp;&nbsp;#####.### |  |

---

The call will only take a few moments of your time. We deeply appreciate your investment in the Pioneer Closed-End Funds. Thank you for your time and consideration.

Sincerely,

Thomas Dusenberry

President

**OFFICIAL BUSINESS** This communication relates to an investment you own in a closed-end

fund advised by Victory Capital Management Inc.

NOBO-REG© 2025 SEI 4