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ISSUER PROFILE · CIK 0000809844 · CUSIP 59318E102

MFS High Yield Municipal TrustCMU

5 13D/G filings 2 distinct filers 0 insider transactions (365d)
1 BOARD-CHANGE

Post-Filing Returns · across 2 activist filings on this issuer

Median 30d
+0.4%
avg +0.4%
Median 60d
+3.7%
avg +3.7%
Median 90d
+0.4%
avg +0.4%
Median 180d
-2.8%
avg -2.8%

Returns measured from each activist filing's date_of_event, split + dividend adjusted via Yahoo Finance.

Cross-Reference Snapshot

Activist filings
5
2 SCHEDULE 13D/A · 1 SCHEDULE · 2 SC
Distinct filers
2
multi-activist cluster
Insiders (365d)
0
0 buys · 0 sales
Latest short DTC
2.36
as of 2026-05-29

13D/G Filings Timeline · 5 total

FiledFormFilerStakeSharesIntent
2026-05-12 SCHEDULE 13D/A Bulldog Investors, LLP 100,155 view →
2026-04-09 SCHEDULE 13D/A Bulldog Investors, LLP 13.55% 3,072,220 BOARD-CHANGE 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 →

FINRA Short Interest History

SettlementShort InterestDays to Cover% Δ vs prior
2026-05-29 206,304 2.36 -12.3%
2026-05-15 235,306 1.00 +17.8%
2026-04-30 199,820 1.00 +7.7%
2026-04-15 185,628 1.00 +13.7%
2026-03-31 163,286 3.01 +15.4%
2026-03-13 141,462 1.00 -0.1%
2026-02-27 141,560 2.11 -2.0%
2026-02-13 144,435 2.32 -1.4%
2026-01-30 146,486 2.73 +3.5%
2026-01-15 141,464 2.22 +109.5%
2025-12-31 67,531 1.00 -7.6%
2025-12-15 73,098 1.00 +156.1%

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