# EDGAR Filing Document

**Accession Number:** 0001504304
**File Stem:** 0001398344-25-017036
**Filing Date:** 2025-8
**Character Count:** 12252
**Document Hash:** 1257fbe5879763468f9d172529448354
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001398344-25-017036.hdr.sgml**: 20250828

**ACCESSION NUMBER**: 0001398344-25-017036

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250828

**DATE AS OF CHANGE**: 20250828

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MFS HIGH YIELD MUNICIPAL TRUST
- **CENTRAL INDEX KEY:** 0000809844

**ORGANIZATION NAME:**
- **EIN:** 042950868
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1130

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-84331
- **FILM NUMBER:** 251273334

**BUSINESS ADDRESS:**
- **STREET 1:** 111 HUNTINGTON AVENUE
- **STREET 2:** 24TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02199
- **BUSINESS PHONE:** 617-954-5000

**MAIL ADDRESS:**
- **STREET 1:** 111 HUNTINGTON AVENUE
- **STREET 2:** 24TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02199

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** COLONIAL MUNICIPAL INCOME TRUST
- **DATE OF NAME CHANGE:** 19920703
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Bulldog Investors, LLP
- **CENTRAL INDEX KEY:** 0001504304

**ORGANIZATION NAME:**
- **EIN:** 270926182
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**BUSINESS ADDRESS:**
- **STREET 1:** PARK 80 WEST - PLAZA TWO
- **STREET 2:** 250 PEHLE AVE. SUITE 708
- **CITY:** SADDLE BROOK
- **STATE:** NJ
- **ZIP:** 07663
- **BUSINESS PHONE:** 201 556-0092

**MAIL ADDRESS:**
- **STREET 1:** PARK 80 WEST - PLAZA TWO
- **STREET 2:** 250 PEHLE AVE. SUITE 708
- **CITY:** SADDLE BROOK
- **STATE:** NJ
- **ZIP:** 07663

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Bulldog Investors, LLC
- **DATE OF NAME CHANGE:** 20130610

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Brooklyn Capital Management LLC
- **DATE OF NAME CHANGE:** 20101026

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 7)**

**MFS High Yield Municipal Trust**

*(Name of Issuer)*

**Common Stock**

*(Title of Class of Securities)*

**59318E102**

*(CUSIP Number)*

**Phillip Goldstein**<br>250 Pehle Ave.<br>Suite 708<br>Saddle Brook NJ 07663<br>914 747-5262

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**08/26/2025**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **59318E102** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Bulldog Investors, LLP** | Name of reporting person<br>**Bulldog Investors, LLP** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**WC** | Source of funds (See Instructions)<br>**WC** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**109810.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**2896773.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**109810.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**2896773.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**3006546.00** | Aggregate amount beneficially owned by each reporting person<br>**3006546.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**11.79%** | Percent of class represented by amount in Row (11)<br>**11.79%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IA** | Type of Reporting Person (See Instructions)<br>**IA** | |

---

| **CUSIP No.** | **59318E102** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Phillip Goldstein** | Name of reporting person<br>**Phillip Goldstein** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**WC** | Source of funds (See Instructions)<br>**WC** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**109810.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**3223158.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**109810.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**3223158.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**3342968.00** | Aggregate amount beneficially owned by each reporting person<br>**3342968.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**13.11%** | Percent of class represented by amount in Row (11)<br>**13.11%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

| **CUSIP No.** | **59318E102** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Andrew Dakos** | Name of reporting person<br>**Andrew Dakos** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**WC** | Source of funds (See Instructions)<br>**WC** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**2896773.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**2896773.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**2896773.00** | Aggregate amount beneficially owned by each reporting person<br>**2896773.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**11.36%** | Percent of class represented by amount in Row (11)<br>**11.36%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock

**(b) Name of Issuer:**
MFS High Yield Municipal Trust

**(c) Address of Issuer's Principal Executive Offices:**
111 Huntington Avenue, 24th Floor, Boston, MA, 02199

This Constitutes Amendment #7 to the schedule 13D filed July 17, 2023. Except as specifically set forth herein, the schedule 13D rmains unmodified.

**Item 5. Interest in Securities of the Issuer**

**(a)**
As per the N-CSR filed on 1/27/25 there were 25,492,782 shares of common stock outstanding as of 11/30/24. The percentages set forth herein were derived using such number. Phillip Goldstein and Andrew Dakos own Bulldog Investors, LLP, a registered investment advisor. As of August 27, 2025, Bulldog Investors, LLP is deemed to be the beneficial owner of 3,006,546 shares of CMU (representing 11.79% of CMU's outstanding shares) soley by virtue of Bulldog Investors, LLP's power to direct the vote of, and dispose of, these shares. As of August 27, 2025, Mr. Goldstein is deemed to be the beneficial owner of 3,342,968 shares of CMU (representing 13.11% of CMU's outstanding shares) and Mr. Dakos is deemed to be the beneficial owner of 2,896,773 shares of CMU (representing 11.36% of CMU's outstanding shares) by virtue of their power to direct the vote of, and dispose of, these shares.

**(b)**
Bulldog Investors, LLP has sole power to dispose of and vote 109,810 shares. Bulldog Investors, LLP has shared power to dispose and vote 2,896,773 shares. Certain of Bulldog Investors, LLP's clients (none of whom beneficially own more than 5% of CMU's shares) share this power with Bulldog Investors. Messrs. Goldstein and Dakos are partners of Bulldog Investors, LLP.

**(c)**
Since the last  filing on 7/16/25 the following shares of CMU were purchased.
Date                      Shares                   Price
8/27/2025            10,000                  3.2800
8/26/2025           20,000                   3.2783
8/22/2025           30,000                   3.2800
8/21/2025           10,000                   3.2667
8/20/2025           18,710                   3.2860
8/19/2025            4,976                    3.2798
8/18/2025            11,810                  3.3279
8/08/2025            10,000                  3.3200
8/05/2025            100                        3.3100
8/04/2025            7,210                    3.3098
8/01/2025            20,119                  3.3093
7/31/2025            12,182                  3.2700
7/29/2025             316                       3.2500
7/28/2025             900                       3.2400
7/25/2025             6,152                   3.2400
7/24/2025             40,000                 3.2400
7/23/2025             40,862                 3.2200
7/22/2025             151                       3.2300
7/21/2025             800                       3.2200
7/18/2025             7,310                   3.2188
7/17/2025             16,625                 3.2361

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Bulldog Investors, LLP

**Signature:** /s/ Andrew Dakos

**Name/Title:** Andrew Dakos, Partner

**Date:** 08/28/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Phillip Goldstein

**Signature:** /s/ Phillip Goldstein

**Name/Title:** Phillip Goldstein, Partner

**Date:** 08/28/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Andrew Dakos

**Signature:** /s/ Andrew Dakos

**Name/Title:** Andrew Dakos, Partner

**Date:** 08/28/2025