CMU MFS High Yield Municipal Trust

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No. 4)*

MFS High Yield Municipal Trust

(Name of Issuer)

Remarketable Variable Rate MuniFund Term Preferred Shares, Series 2051

(Title of Class of Securities)

59318E607

(CUSIP Number)

September 5, 2024

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

☒ Rule 13d-1(b)

☐ Rule 13d-1(c)

☐ Rule 13d-1(d)

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. 59318E607

Item 1(a) Name of issuer:

MFS High Yield Municipal Trust

Item 1(b) Address of issuer’s principal executive offices:

111 Huntington Avenue, 24^th Floor

Boston, MA 02199

2(a) Name of person filing:

JPMorgan Chase Bank, National Association (“JPM”)

2(b) Address or principal business office or, if none, residence:

1111 Polaris Parkway

Columbus, OH 43240

2(c) Citizenship:

United States of America

2(d) Title of class of securities:

Remarketable Variable Rate MuniFund Term Preferred Shares, Series 2051 (“RVMTP Shares”)

2(e) CUSIP No.:

59318E607

Item 3. If this statement is filed pursuant to §§240.13d–1(b) or 240.13d–2(b) or (c), check whether the person filing is a:

(a) ☐ Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);

(b) ☒ Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);

(c) ☐ Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);

(d) ☐ Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C 80a–8);

(e) ☐ An investment adviser in accordance with §240.13d–1(b)(1)(ii)(E);

(f) ☐ An employee benefit plan or endowment fund in accordance with §240.13d–1(b)(1)(ii)(F);

(g) ☐ A parent holding company or control person in accordance with §240.13d–1(b)(1)(ii)(G);

(h) ☐ A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

(i) ☐ A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a–3);

(j) ☐ A non-U.S. institution in accordance with §240.13d–1(b)(1)(ii)(J);

(k) ☐ Group, in accordance with §240.13d–1(b)(1)(ii)(K). If filing as a non-U.S. institution in accordance with §240.13d–1(b)(1)(ii)(J), please specify the type of institution: ____

Item 4. Ownership

Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.

(a) Amount beneficially owned: 510

(b) Percent of class: 100.00%¹

(c) Number of shares as to which the person has:

(i) Sole power to vote or to direct the vote: 0

(ii) Shared power to vote or to direct the vote: 510*

(iii) Sole power to dispose or to direct the disposition of: 510

(iv) Shared power to dispose or to direct the disposition of: 0

* On July 20, 2021 JPM assigned certain preferred class voting rights on the RVMTP Shares to a voting trust (the “Voting Trust”) created pursuant to the Voting Trust Agreement, dated July 20, 2021 among JPM, Glass, Lewis & Co., LLC, as trustee (the “Voting Trustee”) and as voting consultant (the “Voting Consultant”). Voting and consent rights on the RVMTP Shares not assigned to the Voting Trust have been retained by JPM. The Voting Trust provides that with respect to voting or consent matters relating to the voting rights assigned to the Voting Trust, the Voting Consultant analyzes such voting or consent matters and makes a recommendation to the Voting Trustee on voting or consenting. The Voting Trustee is obligated to follow any such recommendations of the Voting Consultant when providing a vote or consent.

Item 5. Ownership of 5 Percent or Less of a Class.

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than 5 percent of the class of securities, check the following ☐.

Item 6. Ownership of More than 5 Percent on Behalf of Another Person.

On September 5, 2024 JPM deposited the 510 RVMTP Shares into a tender option bond trust (a “TOB”) named the J.P. Morgan Putters/Drivers, Series 5074 Trust. The TOB has title to 100% of the RVMTP Shares but does not have the power to dispose or direct the disposition of the RVMTP Shares. No voting rights on the RVMTP Shares have been transferred to the TOB and voting rights on the RVMTP Shares are retained by JPM and the Voting Trust as described in Item 4.

Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.

Not Applicable

Item 8. Identification and Classification of Members of the Group

Not Applicable

Item 9. Notice of Dissolution of Group.

Not Applicable

Item 10. 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.

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.