MFS HIGH YIELD MUNICIPAL TRUST
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SEC XBRL · annualNo structured XBRL financials available (common for pre-2009 filers, foreign issuers, or companies that never reported as a US public company).
5%+ owners
SEC Schedule 13D / 13G · last 3 yrs- Almitas Capital LlcPassive (13G)May 18, 2026
- Rivernorth Capital Management, LlcPassive (13G)May 15, 2026
- Bulldog Investors, LlpActivist (13D)May 12, 2026
- Jpmorgan Chase Bank, N.A.Passive (13G)May 5, 2026
- Sit Investment Associates IncPassive (13G)Oct 2, 2025
- City Of London Investment Management Co LtdPassive (13G)Apr 4, 2025
Holders who disclosed a 5%+ stake. 13D signals intent to influence or control; 13G is a passive holding. Latest filing per holder — open it for the exact stake.
Short interest
FINRA · bi-monthly| Settlement | Shares short | Days to cover | Δ vs prior |
|---|---|---|---|
| May 15, 2026 | 235,306 | 1.0 | +17.8% |
| Apr 30, 2026 | 199,820 | 1.0 | +7.7% |
| Apr 15, 2026 | 185,628 | 1.0 | +13.7% |
| Mar 31, 2026 | 163,286 | 3.0 | +15.4% |
| Mar 13, 2026 | 141,462 | 1.0 | -0.1% |
Shares sold short as reported to FINRA. Days-to-cover = short shares ÷ average daily volume — higher means more potential squeeze pressure.
Material events
SEC Form 8-K · most recentEvents the company reported on Form 8-K, labelled by the SEC item code it filed under — its own classification, not our interpretation.
Recent SEC filings
All filings ↗- SCHEDULE 13G/AMay 18, 2026
- SCHEDULE 13G/AMay 15, 2026
- SCHEDULE 13D/AMay 12, 2026
- SC TO-I/AMay 11, 2026
- SC TO-I/AMay 6, 2026
- SCHEDULE 13D/AMay 5, 2026
- SCHEDULE 13G/AMay 5, 2026
- 4May 5, 2026
- SCHEDULE 13D/AMay 1, 2026
- SCHEDULE 13D/AApr 27, 2026
- NPORT-PApr 24, 2026
- SCHEDULE 13D/AApr 9, 2026
- SC TO-IApr 6, 2026
- N-23C-2Apr 1, 2026
- 4PRIMARY DOCUMENTApr 1, 2026
Event-driven situations (1)
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