SCHEDULE 13D/A Filed 2026-04-09 Event 2026-04-07 Intent: BOARD-CHANGE SEC 0001398344-26-006342 →

Bulldog Investors, LLP → MFS High Yield Municipal Trust CMU

Stake: 13.55% Shares: 3,072,220 CUSIP: 59318E102 Class: Common Stock

AI Analyst Brief conf: medium

Bulldog Investors, a known closed-end fund activist, holds 13.55% of CMU (MFS High Yield Municipal Trust) — their standard playbook targets CEF discounts via tender offers, open-ending, or board pressure; the 13D form (not 13G) signals active intent despite no explicit purpose disclosed in this extract.

Item 4 — Purpose of Transaction

Not extracted from this filing — typically because it's an amendment (13D/A) and Item 4 is unchanged from the parent filing. Read the raw SEC filing →

Cross-References

Insider Activity (last 365d)

0 transactions

0 buys · 0 sales · 0 awards/exercises

Issuer Cluster

6 13D/G filings on this issuer

5 other filings besides this one

Filer Track Record

44 filings by this filer

43 other filings in the data moat

Short Interest · settle 2026-05-29

DTC 2.36

206,304 shares short · -12.3% vs prior

Post-Filing Returns · since 2026-04-07 on CMU

+1 day

+1.1%

+5 days

0.0%

+30 days

—

+60 days

—

+90 days

—

+180 days

—

Anchor price 3.60 on closest trading day on/after 2026-04-07. Source: Yahoo Finance daily adj_close (split + dividend adjusted).

Other 13D/G Filings on MFS High Yield Municipal Trust

Filed	Form	Filer	Stake	Shares
2026-07-01	SCHEDULE 13G/A	JPMorgan Chase Bank, N.A.	—	—	view →
2026-05-12	SCHEDULE 13D/A	Bulldog Investors, LLP	—	100,155	view →
2025-02-14	SCHEDULE	Bulldog Investors, LLP	11.29%	2,876,902	view →
2024-01-08	SC	Saba Capital Management, L.P.	—	—	view →
2024-01-02	SC	Bulldog Investors, LLP	—	—	view →

Other Filings by Bulldog Investors, LLP

Filed	Form	Issuer	Stake	Shares
2026-07-28	SCHEDULE 13D	Dynamix Corp	3.64%	669,921	view →
2026-05-12	SCHEDULE 13D/A	MFS High Yield Municipal Trust	—	100,155	view →
2025-02-14	SCHEDULE	MFS HIGH YIELD MUNICIPAL TRUST CMU	11.29%	2,876,902	view →
2024-01-22	SC	TORTOISE ENERGY INDEPENDENCE FUND, INC.	—	—	view →
2024-01-08	SC	NXG NextGen Infrastructure Income Fund NXG-RI	—	—	view →
2024-01-02	SC	MFS HIGH YIELD MUNICIPAL TRUST CMU	—	—	view →
2023-07-19	SC	TORTOISE ENERGY INDEPENDENCE FUND, INC.	—	—	view →
2023-06-12	SC	NXG NextGen Infrastructure Income Fund NXG-RI	—	—	view →
2023-04-04	SC	Nuveen Short Duration Credit Opportunities Fund	—	—	view →
2023-03-13	SC	FIRST TRUST DYNAMIC EUROPE EQUITY INCOME FUND	—	—	view →
2023-03-06	SC	FIRST TRUST DYNAMIC EUROPE EQUITY INCOME FUND	—	—	view →
2023-01-11	SC	Delaware Enhanced Global Dividend & Income Fund	—	—	view →
2022-12-06	SC	FIRST TRUST DYNAMIC EUROPE EQUITY INCOME FUND	—	—	view →
2022-12-05	SC	Delaware Enhanced Global Dividend & Income Fund	—	—	view →
2022-09-20	SC	Delaware Enhanced Global Dividend & Income Fund	—	—	view →
2022-07-13	SC	TAIWAN FUND INC TWN	—	—	view →
2022-04-14	SC	TORTOISE ENERGY INDEPENDENCE FUND, INC.	—	—	view →
2022-04-14	SC	TORTOISE POWER & ENERGY INFRASTRUCTURE FUND INC	—	—	view →
2022-03-04	SC	TORTOISE POWER & ENERGY INFRASTRUCTURE FUND INC	—	—	view →
2022-03-03	SC	TORTOISE ENERGY INDEPENDENCE FUND, INC.	—	—	view →

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