<SEC-DOCUMENT>0001072613-25-000267.txt : 20250404
<SEC-HEADER>0001072613-25-000267.hdr.sgml : 20250404
<ACCEPTANCE-DATETIME>20250404160056
ACCESSION NUMBER:		0001072613-25-000267
CONFORMED SUBMISSION TYPE:	SCHEDULE 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20250404
DATE AS OF CHANGE:		20250404

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 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-84331
		FILM NUMBER:		25813864

	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:			CITY OF LONDON INVESTMENT MANAGEMENT CO LTD
		CENTRAL INDEX KEY:			0001034546
		ORGANIZATION NAME:           	
		EIN:				000000000
		FISCAL YEAR END:			0630

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		77 GRACECHURCH STREET
		CITY:			LONDON
		STATE:			X0
		ZIP:			EC3V0AS
		BUSINESS PHONE:		4417171107

	MAIL ADDRESS:	
		STREET 1:		77 GRACECHURCH STREET
		CITY:			LONDON
		STATE:			X0
		ZIP:			EC3V0AS
</SEC-HEADER>
<DOCUMENT>
<TYPE>SCHEDULE 13G/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/schedule13g" xmlns:com="http://www.sec.gov/edgar/common">
  <headerData>
    <submissionType>SCHEDULE 13G/A</submissionType>
    <previousAccessionNumber>0001072613-24-000874</previousAccessionNumber>
    <filerInfo>
      <filer>
        <filerCredentials>
          <!-- Field: Pseudo-Tag; ID: Name; Data: CITY OF LONDON INVESTMENT MANAGEMENT CO LTD -->
          <cik>0001034546</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <coverPageHeader>
      <amendmentNo>1</amendmentNo>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <eventDateRequiresFilingThisStatement>03/31/2025</eventDateRequiresFilingThisStatement>
      <issuerInfo>
        <issuerCik>0000809844</issuerCik>
        <issuerName>MFS High Yield Municipal Trust</issuerName>
        <issuerCusip>59318E102</issuerCusip>
        <issuerPrincipalExecutiveOfficeAddress>
          <com:street1>111 Huntington Avenue</com:street1>
          <com:street2>24th Floor</com:street2>
          <com:city>Boston</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02199</com:zipCode>
        </issuerPrincipalExecutiveOfficeAddress>
      </issuerInfo>
      <designateRulesPursuantThisScheduleFiled>
        <designateRulePursuantThisScheduleFiled>Rule 13d-1(b)</designateRulePursuantThisScheduleFiled>
      </designateRulesPursuantThisScheduleFiled>
    </coverPageHeader>
    <coverPageHeaderReportingPersonDetails>


      <reportingPersonName>City of London Investment Management Company Limited</reportingPersonName>
      <citizenshipOrOrganization>X0</citizenshipOrOrganization>
      <reportingPersonBeneficiallyOwnedNumberOfShares>
        <soleVotingPower>1234194.00</soleVotingPower>
        <sharedVotingPower>0.00</sharedVotingPower>
        <soleDispositivePower>1234194.00</soleDispositivePower>
        <sharedDispositivePower>0.00</sharedDispositivePower>
      </reportingPersonBeneficiallyOwnedNumberOfShares>
      <reportingPersonBeneficiallyOwnedAggregateNumberOfShares>1234194.00</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>
      <aggregateAmountExcludesCertainSharesFlag>N</aggregateAmountExcludesCertainSharesFlag>
      <classPercent>4.8</classPercent>
      <typeOfReportingPerson>IA</typeOfReportingPerson>
    </coverPageHeaderReportingPersonDetails>
    <items>
      <item1>
        <issuerName>MFS High Yield Municipal Trust</issuerName>
        <issuerPrincipalExecutiveOfficeAddress>111 Huntington Avenue, 24th Floor, Boston, MA 02199</issuerPrincipalExecutiveOfficeAddress>
      </item1>
      <item2>
        <filingPersonName>This statement is being filed by City of London Investment Management Company Limited ("CLIM" or the "Reporting Person").  CLIM is a fund manager, which specializes in investing in closed-end investment companies and is a registered investment adviser under Section 203 of the Investment Advisers Act of 1940. CLIM is controlled by City of London Investment Group plc ("CLIG"), which is listed on the London Stock Exchange. However, in accordance with SEC Release No. 34-39538 (January 12, 1998), effective informational barriers have been established between CLIM and CLIG such that voting and investment power over the subject securities is exercised by CLIM independently of CLIG, and, accordingly, attribution of beneficial ownership is not required between CLIM and CLIG.

CLIM is principally engaged in the business of providing investment advisory services to various public and private investment funds, including Opportunistic Value Fund ("APOLLO"), a private investment fund organized as a Delaware business trust, and unaffiliated third-party segregated accounts over which CLIM exercises discretionary voting and investment authority (the "Segregated Accounts").

APOLLO is referred to herein as the "City of London Fund.

"The Shares to which this Schedule 13G relates are owned directly by the City of London Funds and the Segregated Accounts.</filingPersonName>
        <principalBusinessOfficeOrResidenceAddress>77 Gracechurch Street
London EC3V 0AS
England</principalBusinessOfficeOrResidenceAddress>
        <citizenship>England and Wales</citizenship>
      </item2>
      <item3>
        <notApplicableFlag>N</notApplicableFlag>
        <typeOfPersonFiling>IA</typeOfPersonFiling>
      </item3>
      <item4>
        <amountBeneficiallyOwned>1,234,194.00</amountBeneficiallyOwned>
        <classPercent>4.8 %</classPercent>
        <numberOfSharesPersonHas>
          <solePowerOrDirectToVote>1,234,194.00</solePowerOrDirectToVote>
          <sharedPowerOrDirectToVote>0</sharedPowerOrDirectToVote>
          <solePowerOrDirectToDispose>1,234,194.00</solePowerOrDirectToDispose>
          <sharedPowerOrDirectToDispose>0</sharedPowerOrDirectToDispose>
        </numberOfSharesPersonHas>
      </item4>
      <item5>
        <notApplicableFlag>N</notApplicableFlag>
        <classOwnership5PercentOrLess>Y</classOwnership5PercentOrLess>
      </item5>
      <item6>
        <notApplicableFlag>Y</notApplicableFlag>
      </item6>
      <item7>
        <notApplicableFlag>Y</notApplicableFlag>
      </item7>
      <item8>
        <notApplicableFlag>Y</notApplicableFlag>
      </item8>
      <item9>
        <notApplicableFlag>Y</notApplicableFlag>
      </item9>
      <item10>
        <notApplicableFlag>N</notApplicableFlag>
        <certifications>By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.</certifications>
      </item10>
    </items>
    <signatureInformation>
      <reportingPersonName>City of London Investment Management Company Limited</reportingPersonName>
      <signatureDetails>
        <signature>/s/ Catrina Reagan</signature>
        <title>Catrina Reagan/US Chief Compliance Officer</title>
        <date>04/04/2025</date>
      </signatureDetails>
    </signatureInformation>
  </formData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
