Almitas Capital reports 5.9% stake in MFS High Yield (CMU)

Rhea-AI Filing Summary

MFS HIGH YIELD MUNICIPAL TRUST ownership disclosure: Almitas Capital LLC reports beneficial ownership of 1,497,718 shares of Common Stock, representing 5.9% of the class. The filing is an amendment and is signed by Ronald Mass as Managing Principal on 05/18/2026.

Insights

Institutional Ownership Analyst

Almitas reports a 5.9% stake in CMU, a notable but non‑controlling position.

Almitas Capital LLC lists 1,497,718 shares and sole voting and dispositive power over those shares. The ownership level is below common activist thresholds, indicating passive significant‑holder status rather than control.

Subsequent filings may clarify any trading plans or changes; current paperwork shows a straightforward beneficial ownership amendment.

Securities Compliance Specialist

The amendment formalizes reporting obligations under Schedule 13G/A with clear power disclosures.

The filing specifies sole voting power and sole dispositive power for 1,497,718 shares and cites CUSIP 59318E102. It follows standard beneficial‑ownership reporting conventions and provides the required signer identification.

Investors should reference future amendments for any change in percent ownership or voting arrangements.

Key Figures

Shares beneficially owned: 1,497,718 shares Percent of class: 5.9% Filing signature date: 05/18/2026 +1 more

4 metrics

Shares beneficially owned 1,497,718 shares Common Stock reported in Schedule 13G/A

Percent of class 5.9% Percent of common stock class

Filing signature date 05/18/2026 Signature by Managing Principal Ronald Mass

CUSIP 59318E102 Issuer identifier for Common Stock

Key Terms

Schedule 13G/A, beneficially owned, sole dispositive power

3 terms

Schedule 13G/A regulatory

"Amendment No. 1 ) MFS HIGH YIELD MUNICIPAL TRUST"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

beneficially owned financial

"Amount beneficially owned: 1,497,718 (b) Percent of class: 5.9%"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole dispositive power regulatory

"Sole Dispositive Power 1,497,718.00"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/18/2026 - 01:15 PM Learn about SEC filing dates

FAQ

What stake does Almitas Capital LLC report in CMU?

Almitas Capital LLC reports ownership of 1,497,718 shares, representing 5.9% of CMU's common stock. The filing explicitly lists sole voting and sole dispositive power over these shares and cites CUSIP 59318E102.

When was the Schedule 13G/A amendment signed for CMU?

The amendment is signed by Ronald Mass, Managing Principal of Almitas Capital LLC, dated 05/18/2026. The cover shows an effective reference date of 03/31/2026 tied to the issuer's record information in the filing.

Does Almitas exercise shared voting power over CMU shares?

No. The filing states Almitas Capital LLC has sole voting power for 1,497,718 shares and reports 0 shares of shared voting power or shared dispositive power in this amendment.

What is the CUSIP and issuer named in the filing?

The filing identifies the issuer as MFS HIGH YIELD MUNICIPAL TRUST and provides CUSIP 59318E102. The issuer's principal executive office address is listed as 111 Huntington Avenue, 24th Floor, Boston, MA.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

MFS HIGH YIELD MUNICIPAL TRUST

(Name of Issuer)

Common Stock

(Title of Class of Securities)

59318E102

(CUSIP Number)

03/31/2026

(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)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 59318E102

1

Names of Reporting Persons

Almitas Capital LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 1,497,718.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,497,718.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,497,718.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.9 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: MFS HIGH YIELD MUNICIPAL TRUST
(b)	Address of issuer's principal executive offices: 111 HUNTINGTON AVENUE, 24TH FLOOR, BOSTON, MASSACHUSETTS, 02199.
Item 2.
(a)	Name of person filing: Almitas Capital LLC
(b)	Address or principal business office or, if none, residence: 1460 4th Street, Suite 300 Santa Monica, CA 90401
(c)	Citizenship: Delaware
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 59318E102
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). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 1,497,718
(b)	Percent of class: 5.9%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 1,497,718
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 1,497,718
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
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, other than activities solely in connection with a nomination under § 240.14a-11.

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.

Almitas Capital LLC

Signature:	Ronald Mass
Name/Title:	Managing Principal
Date:	05/18/2026