# EDGAR Filing Document

**Accession Number:** 0001223026
**File Stem:** 0000940400-26-025437
**Filing Date:** 2026-6
**Character Count:** 5427
**Document Hash:** b58dd26afa7f50e895879ff919aa90ff
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000940400-26-025437.hdr.sgml**: 20260625

**ACCESSION NUMBER**: 0000940400-26-025437

**CONFORMED SUBMISSION TYPE**: NPORT-P

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260430

**FILED AS OF DATE**: 20260625

**DATE AS OF CHANGE**: 20260625

**PERIOD START**: 20260430

**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:** NPORT-P
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-21321
- **FILM NUMBER:** 261118021

**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

## Form NPORT-P: Monthly Portfolio Investments Report

### NPORT-P: Part A: General Information

**Item A.1. Information about the Registrant.**

- **a. Name of Registrant:** Pioneer Municipal High Income Fund, Inc.

- **b. Investment Company Act file number:** 811-21321

- **c. CIK number of Registrant:** 0001223026

- **d. LEI of Registrant:** 5493009JYKCUKTUKGP36

- **e. Address and telephone number of Registrant.**

  - **Street Address 1:** 60 State Street

  - **City:** Boston

  - **State:** MA

  - **Foreign country:** US

  - **Zip / Postal Code:** 02109

  - **Telephone number:** 617-422-4947

**Item A.2. Information about the Series.**

- **a. Name of Series:** Pioneer Municipal High Income Fund, Inc.

- **c. LEI of Series:** 5493009JYKCUKTUKGP36

**Item A.3. Reporting period.**

- **a. Date of fiscal year-end:** 2026-04-30

- **b. Date as of which information is reported:** 2026-04-30

**Item A.4. Final filing**

Does the Fund anticipate that this will be its final filing on Form N-PORT? **No**

### Fund Information

**Total Assets:** $4319201.91

**Total Liabilities:** $92958.12

**Net Assets:** $4226243.79

**Cash Not Reported:** $170602.12

**Currency Risk Metrics (dv01):**

- 

**Credit Spread Risk - Investment Grade (dv01):**

- **3-Month:** 0.00000000 | **1-Year:** 0.00000000 | **5-Year:** 0.00000000 | **10-Year:** 0.00000000 | **30-Year:** 0.00000000

**Credit Spread Risk - Non-Investment Grade (dv01):**

- **3-Month:** 0.00000000 | **1-Year:** 0.00000000 | **5-Year:** -93.00000000 | **10-Year:** 0.00000000 | **30-Year:** -1816.00000000

**Monthly Return Information**

| Class               | Month 1 Return (%)   | Month 2 Return (%)   | Month 3 Return (%)   |
|:---|:---|:---|:---|
| Class ID C000000000 |  |  |  |

**Monthly Gains & Losses**

| Period   | Net Realized Gain/Loss   | Net Unrealized Appreciation/Depreciation   |
|:---|:---|:---|
| Month 1  | $-251067.89              | $453197.21                                 |
| Month 2  | $0.00                    | $-27238.09                                 |
| Month 3  | $0.00                    | $12941.16                                  |

### Schedule of Portfolio Investments

| Name                                         | Title                     | Identifiers                                   | Payoff Profile   | Asset Category   | Issuer Category   | Country   |   Balance | Units   | Value (USD)   | % of Net Assets   | Maturity Date   | Coupon Type   | Annualized Rate (%)   | Restricted?   |   Fair Value Level | Lending Status   |
|:---|:---|:---|:---|:---|:---|:---|---:|:---|:---|:---|:---|:---|:---|:---|---:|:---|
| CENTRAL FALLS DETENTION FACILITY CORP (RI)   | RI CENFAC 7.25 07/15/2035 | CUSIP: 153457AX4<br>LEI: N/A                  | Long             | DBT              | MUN               | US        |   5900000 | PA      | $2070900.00   | 49.00%            | 2035-07-15      | Fixed         | 7.25%                 | No            |                  3 | On Loan: No      |
| ARLINGTON HIGHER EDUCATION FINANCE CORP (TX) | TX ARLEDU 7 03/01/2034    | CUSIP: 041806AM2<br>LEI: N/A                  | Long             | DBT              | MUN               | US        |   1000000 | PA      | $970795.40    | 22.97%            | 2034-03-01      | None          | 0.00%                 | No            |                  3 | On Loan: No      |
| ARLINGTON HIGHER EDUCATION FINANCE CORP (TX) | TX ARLEDU 5.45 03/01/2049 | CUSIP: 041806XD7<br>LEI: N/A                  | Long             | DBT              | MUN               | US        |    480000 | PA      | $406509.21    | 9.62%             | 2049-03-01      | Fixed         | 5.45%                 | No            |                  3 | On Loan: No      |
| PHILADELPHIA PA AUTH                         | PA PHIEDU 5 11/15/2050    | CUSIP: 71780CAM2<br>LEI: 549300DIY68KQZEW7M79 | Long             | DBT              | MUN               | US        |   1000000 | PA      | $661285.53    | 15.65%            | 2050-11-15      | Fixed         | 5.00%                 | No            |                  3 | On Loan: No      |

### Signature

**Date Signed:** 2026-06-24

**Name of Applicant:** Pioneer Municipal High Income Fund, Inc.

**Signature:** Carol Trevino

**Name of Signer:** Carol Trevino

**Title:** Treasurer