MFS High Yield Municipal Trust
CMUDelisted Jun 8, 2026- SEC CIK
- 0000809844
MFS High Yield Municipal Trust was delisted on Jun 8, 2026; its insiders filed their last Form 4 on Aug 11, 2026; 45 institutions reported holding it in 13F filings for Q1 2026, worth $45.5M in total; no superinvestor held it.
Holders of 5% or more of CMU
Holders whose latest Schedule 13D or 13G filing reports 5% or more of MFS High Yield Municipal Trust, largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Bulldog Investors, LLP | 13D/A | 15.72%4.01M shares | +1.47 ppfrom 14.25% | Feb 14, 20255 filings | Dec 16, 2025 | SEC |
| Rivernorth Capital Management, LLC | 13G/A | 10.12%2.58M shares | +2.61 ppfrom 7.51% | May 15, 20252 filings | Oct 7, 2025 | SEC |
| Almitas Capital LLC | 13G | 5.90%1.51M shares | New | Nov 14, 20251 filing | Nov 14, 2025 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
11 Schedule 13D and 13G filings on MFS High Yield Municipal Trust, newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Feb 17, 20266:55 PM ET | Almitas Capital LLC | 13G | 5.90%2.19M shares | 0.00 ppfrom 5.90% | Dec 31, 2025 | SEC |
| Dec 16, 20254:29 PM ET | Bulldog Investors, LLPand 2 others | 13D/A | 15.72%4.01M shares | +1.47 ppfrom 14.25% | Dec 12, 2025 | SEC |
| Nov 14, 20257:38 PM ET | Almitas Capital LLC | 13G | 5.90%1.51M shares | New | Sep 30, 2025 | SEC |
| Nov 14, 20254:05 PM ET | Bulldog Investors, LLPand 2 others | 13D/A | 14.25%3.63M shares | +1.14 ppfrom 13.11% | Nov 12, 2025 | SEC |
| Oct 7, 20253:43 PM ET | Rivernorth Capital Management, LLC | 13G/A | 10.12%2.58M shares | +2.61 ppfrom 7.51% | Sep 30, 2025 | SEC |
| Oct 2, 20254:41 PM ET | Sit Investment Associates Incand 1 other | 13G/A | 4.10%1.05M shares | −3.80 ppfrom 7.90%Below 5% | Sep 30, 2025 | SEC |
| Aug 28, 20254:05 PM ET | Bulldog Investors, LLPand 2 others | 13D/A | 13.11%3.34M shares | +1.04 ppfrom 12.07% | Aug 26, 2025 | SEC |
| Jul 16, 20255:03 PM ET | Bulldog Investors, LLPand 2 others | 13D/A | 12.07%3.08M shares | +0.78 ppfrom 11.29% | Jul 15, 2025 | SEC |
| May 15, 202510:11 AM ET | Rivernorth Capital Management, LLC | 13G/A | 7.51%1.91M shares | – | Mar 31, 2025 | SEC |
| Apr 4, 20254:00 PM ET | City of London Investment Management Co Ltd | 13G/A | 4.80%1.23M shares | –Below 5% | Mar 31, 2025 | SEC |
| Feb 14, 20254:05 PM ET | Bulldog Investors, LLPand 2 others | 13D/A | 11.29%2.88M shares | – | Dec 31, 2024 | SEC |
| Jan 3, 20253:13 PM ET | Sit Investment Associates Incand 1 other | 13G | 7.90%2.00M shares | New | Dec 31, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell MFS High Yield Municipal Trust shares.
No Form 144 notices for MFS High Yield Municipal Trust are on file.