<SEC-DOCUMENT>0001398344-26-009013.txt : 20260512
<SEC-HEADER>0001398344-26-009013.hdr.sgml : 20260512
<ACCEPTANCE-DATETIME>20260512160512
ACCESSION NUMBER:		0001398344-26-009013
CONFORMED SUBMISSION TYPE:	SCHEDULE 13D/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20260512
DATE AS OF CHANGE:		20260512

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:		26968397

	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
</SEC-HEADER>
<DOCUMENT>
<TYPE>SCHEDULE 13D/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
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<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/schedule13D" xmlns:com="http://www.sec.gov/edgar/common">
  <schemaVersion>X0202</schemaVersion>
<headerData>
    <submissionType>SCHEDULE 13D/A</submissionType>
    <previousAccessionNumber>001504304-23-000019</previousAccessionNumber>
    <filerInfo>
      <filer>
        <filerCredentials>
          <!-- Field: Pseudo-Tag; ID: Name; Data: Bulldog Investors, LLP -->
          <cik>0001504304</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>


    </filerInfo>
  </headerData>
  <formData>
    <coverPageHeader>
      <amendmentNo>14</amendmentNo>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <dateOfEvent>05/06/2026</dateOfEvent>
      <previouslyFiledFlag>false</previouslyFiledFlag>
      <issuerInfo>
        <issuerCIK>0000809844</issuerCIK>
        <issuerCusips>
          <issuerCusipNumber>59318E102</issuerCusipNumber>
        </issuerCusips>
        <issuerName>MFS High Yield Municipal Trust</issuerName>
        <address>
          <com:street1>111 Huntington Avenue</com:street1>
          <com:city>Boston</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02199</com:zipCode>
        </address>
      </issuerInfo>
      <authorizedPersons>
        <notificationInfo>
          <personName>Phillip Goldstein</personName>
          <personPhoneNum>914 747-5262</personPhoneNum>
          <personAddress>
            <com:street1>250 Pehle Ave.</com:street1>
            <com:street2>Suite 708</com:street2>
            <com:city>Saddle Brook</com:city>
            <com:stateOrCountry>NJ</com:stateOrCountry>
            <com:zipCode>07663</com:zipCode>
          </personAddress>
        </notificationInfo>
      </authorizedPersons>
    </coverPageHeader>
    <reportingPersons>
      <reportingPersonInfo>
        <reportingPersonCIK>0001504304</reportingPersonCIK>
        <reportingPersonNoCIK>N</reportingPersonNoCIK>
        <reportingPersonName>Bulldog Investors, LLP</reportingPersonName>
        <fundType>WC</fundType>
        <legalProceedings>N</legalProceedings>
        <citizenshipOrOrganization>DE</citizenshipOrOrganization>
        <soleVotingPower>10394.00</soleVotingPower>
        <sharedVotingPower>89761.00</sharedVotingPower>
        <soleDispositivePower>10394.00</soleDispositivePower>
        <sharedDispositivePower>89761.00</sharedDispositivePower>
        <aggregateAmountOwned>100155.00</aggregateAmountOwned>
        <isAggregateExcludeShares>N</isAggregateExcludeShares>
        <percentOfClass>0.79</percentOfClass>
        <typeOfReportingPerson>IA</typeOfReportingPerson>
      </reportingPersonInfo>
      <reportingPersonInfo>
        <reportingPersonNoCIK>Y</reportingPersonNoCIK>
        <reportingPersonName>Phillip Goldstein</reportingPersonName>
        <fundType>WC</fundType>
        <legalProceedings>N</legalProceedings>
        <citizenshipOrOrganization>X1</citizenshipOrOrganization>
        <soleVotingPower>10394.00</soleVotingPower>
        <sharedVotingPower>122796.00</sharedVotingPower>
        <soleDispositivePower>10394.00</soleDispositivePower>
        <sharedDispositivePower>122796.00</sharedDispositivePower>
        <aggregateAmountOwned>133190.00</aggregateAmountOwned>
        <isAggregateExcludeShares>N</isAggregateExcludeShares>
        <percentOfClass>1.04</percentOfClass>
        <typeOfReportingPerson>IN</typeOfReportingPerson>
      </reportingPersonInfo>
      <reportingPersonInfo>
        <reportingPersonNoCIK>Y</reportingPersonNoCIK>
        <reportingPersonName>Andrew Dakos</reportingPersonName>
        <fundType>WC</fundType>
        <legalProceedings>N</legalProceedings>
        <citizenshipOrOrganization>X1</citizenshipOrOrganization>
        <soleVotingPower>0.00</soleVotingPower>
        <sharedVotingPower>90245.00</sharedVotingPower>
        <soleDispositivePower>0.00</soleDispositivePower>
        <sharedDispositivePower>90245.00</sharedDispositivePower>
        <aggregateAmountOwned>90245.00</aggregateAmountOwned>
        <isAggregateExcludeShares>N</isAggregateExcludeShares>
        <percentOfClass>0.71</percentOfClass>
        <typeOfReportingPerson>IN</typeOfReportingPerson>
      </reportingPersonInfo>
    </reportingPersons>
    <items1To7>
      <item1>
        <securityTitle>Common Stock</securityTitle>
        <issuerName>MFS High Yield Municipal Trust</issuerName>
        <issuerPrincipalAddress>
          <com:street1>111 Huntington Avenue</com:street1>
          <com:city>Boston</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02199</com:zipCode>
        </issuerPrincipalAddress>
        <commentText>This Constitutes Amendment #14 to the schedule 13D filed July 17, 2023. Except as specifically set forth herein, the schedule 13D remains unmodified.</commentText>
      </item1>
      <item5>
        <percentageOfClassSecurities>As per the tender results in the press release on 5/6/26 there were 12,746,391 shares of common stock outstanding as of May 6, 2026. 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 May 6, 2026, Bulldog Investors, LLP is deemed to be the beneficial owner of 100,155 shares of CMU (representing 0.79% of CMU's outstanding shares) solely by virtue of Bulldog Investors, LLP's power to direct the vote of, and dispose of, these shares. As of May 6, 2026, Mr. Goldstein is deemed to be the beneficial owner of 133,190 shares of CMU (representing 1.04% of CMU's outstanding shares) and Mr. Dakos is deemed to be the beneficial owner of 90,245 Shares of CMU (representing 0.71% of CMU's outstanding shares) by virtue of their power to direct the vote of, and dispose of, these shares.</percentageOfClassSecurities>
        <numberOfShares>Bulldog Investors, LLP has sole power to dispose of and vote 10,394 shares. Bulldog Investors, LLP has shared power to dispose and vote 89,761 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.</numberOfShares>
        <transactionDesc>Since the last filing on 5/5/26, the following shares were disposed of:
Date                      Shares           Price
5/4/26                   (141,450)      3.6400
5/4/26                   (79,573)        3.6456
5/6/26                (1,410,919)      3.71</transactionDesc>
        <listOfShareholders>Clients of Bulldog Investors, LLP and the owners of accounts reflected herein are entitled to receive any dividends or sales proceeds.</listOfShareholders>
        <date5PercentOwnership>The Reporting Persons ceased to be the beneficial owner of more than 5% of CMU's common stock on May 6, 2026 based on the tender offer results set forth in the Company's press release published 5/6/26.</date5PercentOwnership>
      </item5>
    </items1To7>
    <signatureInfo>
      <signaturePerson>
        <signatureReportingPerson>Bulldog Investors, LLP</signatureReportingPerson>
        <signatureDetails>
          <signature>/s/ Andrew Dakos</signature>
          <title>Andrew Dakos, Partner</title>
          <date>05/07/2026</date>
        </signatureDetails>
      </signaturePerson>
      <signaturePerson>
        <signatureReportingPerson>Phillip Goldstein</signatureReportingPerson>
        <signatureDetails>
          <signature>/s/ Phillip Goldstein</signature>
          <title>Phillip Goldstein</title>
          <date>05/07/2026</date>
        </signatureDetails>
      </signaturePerson>
      <signaturePerson>
        <signatureReportingPerson>Andrew Dakos</signatureReportingPerson>
        <signatureDetails>
          <signature>/s/ Andrew Dakos</signature>
          <title>Andrew Dakos</title>
          <date>05/07/2026</date>
        </signatureDetails>
      </signaturePerson>
    </signatureInfo>
  </formData>
</edgarSubmission>
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</DOCUMENT>
</SEC-DOCUMENT>
