[Form 4] MFS HIGH YIELD MUNICIPAL TRUST Insider Trading Activity

Rhea-AI Filing Summary

MFS Investment Management filed a Form 4 reporting a change in beneficial ownership for MFS High Yield Municipal Trust (CMU) related to reporting person Kanwal Amrit, identified as an officer of the advisor. The form lists a transaction date of 04/02/2025 but the tables for non-derivative and derivative securities contain no quantities, prices, or ownership totals. The filing is signed by Christopher R. Bohane on 10/06/2025.

Positive

• None.

Negative

• No securities quantities disclosed in Table I or Table II despite a listed transaction date 04/02/2025
• No post-transaction ownership totals are provided, preventing assessment of insider stake change

Insights

Corporate Governance Analyst

Form 4 lists an advisor officer and a transaction date but lacks any reported share amounts.

The filing names Kanwal Amrit of MFS Investment Management as the reporting person and shows a transaction date of 04/02/2025. The form indicates an officer relationship to the issuer MFS High Yield Municipal Trust (CMU).

The key limitation is that both Table I and Table II are blank: no shares acquired or disposed, no prices, and no post-transaction ownership totals are provided, so investor impact cannot be assessed from this filing alone. Expect any material ownership details to appear in an amended filing if omitted.

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

X

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

KANWAL AMRIT

(Last) (First) (Middle)

MFS INVESTMENT MANAGEMENT

111 HUNTINGTON AVENUE

(Street)

BOSTON MA 02199

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
MFS HIGH YIELD MUNICIPAL TRUST [ CMU ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
	Officer (give title below)	X	Other (specify below)
			OFFICER OF THE ADVISOR

3. Date of Earliest Transaction (Month/Day/Year)
04/02/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

	CHRISTOPHER R. BOHANE	10/06/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What does the Form 4 for CMU filed by MFS Investment Management show?

The Form 4 names Kanwal Amrit (an officer of the advisor) and lists a transaction date of 04/02/2025, but it contains no reported share amounts, prices, or ownership totals.

Does the filing indicate whether shares were bought or sold?

No. The tables for non-derivative and derivative securities are blank, so no buy or sell amounts are disclosed.

Who signed the Form 4 and when?

The filing is signed by Christopher R. Bohane on 10/06/2025.

Is there an admission that the transaction used a 10b5-1 plan?

The form reproduces the 10b5-1 checkbox language, but no explicit checked box or declaration is present in the disclosed text.

What should investors look for next regarding this filing?

Watch for an amendment or supplemental filing that provides share counts, prices, and resulting ownership totals, which are necessary to assess materiality.