Mfs High Yield Municipal Trust has 18 Schedule 13D or 13G filings on record since 2025-07-16. 1 holder's latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Rivernorth Capital Management, LLC | 11.6% | 2,955,950 | SCHEDULE 13G/A, 2026-05-15 | 2026-03-31 |
| Sit Investment Associates, Inc. | 4.1% | 1,045,340 | SCHEDULE 13G/A, 2025-10-02 | 2025-09-30 |
| Bulldog Investors, LLP | 1.04% | 100,155 | SCHEDULE 13D/A, 2026-05-12 | 2026-05-06 |
| Almitas Capital LLC | 0% | 0 | SCHEDULE 13G/A, 2026-08-21 | 2026-06-30 |
| JPMorgan Chase Bank, National Association | 0% | 0 | SCHEDULE 13G/A, 2026-07-01 | 2026-06-08 |
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-16 | Bulldog Investors, LLP | 12.07% | SCHEDULE 13D/A |
| 2025-08-28 | Bulldog Investors, LLP | 13.11% | SCHEDULE 13D/A |
| 2025-10-02 | Sit Investment Associates, Inc. | 4.1% | SCHEDULE 13G/A |
| 2025-10-07 | Rivernorth Capital Management, LLC | 10.12% | SCHEDULE 13G/A |
| 2025-11-14 | Bulldog Investors, LLP | 14.25% | SCHEDULE 13D/A |
| 2025-11-14 | Almitas Capital LLC | 5.9% | SCHEDULE 13G |
| 2025-12-16 | Bulldog Investors, LLP | 15.72% | SCHEDULE 13D/A |
| 2026-02-17 | Almitas Capital LLC | 5.9% | SCHEDULE 13G |
| 2026-04-09 | Bulldog Investors, LLP | 13.55% | SCHEDULE 13D/A |
| 2026-04-27 | Bulldog Investors, LLP | 12.54% | SCHEDULE 13D/A |
| 2026-05-01 | Bulldog Investors, LLP | 11.15% | SCHEDULE 13D/A |
| 2026-05-05 | JPMorgan Chase Bank, National Association | 100% | SCHEDULE 13G/A |
| 2026-05-05 | Bulldog Investors, LLP | 6.92% | SCHEDULE 13D/A |
| 2026-05-12 | Bulldog Investors, LLP | 1.04% | SCHEDULE 13D/A |
| 2026-05-15 | Rivernorth Capital Management, LLC | 11.6% | SCHEDULE 13G/A |
| 2026-05-18 | Almitas Capital LLC | 5.9% | SCHEDULE 13G/A |
| 2026-07-01 | JPMorgan Chase Bank, National Association | 0% | SCHEDULE 13G/A |
| 2026-08-21 | Almitas Capital LLC | 0% | SCHEDULE 13G/A |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.