MFS High Yield Municipal Trust
US ˙ NYSE ˙ US59318E1029

SecurityCMU / MFS High Yield Municipal Trust
InstitutionAdvisor Group Holdings, Inc.
Latest Disclosed Ownership46,113 shares
Latest Disclosed Value $ 165,091
Advisor Group Holdings, Inc. reports 28.20% decrease in ownership of CMU / MFS High Yield Municipal Trust

On May 15, 2026 - Advisor Group Holdings, Inc. filed a 13F-HR form disclosing ownership of 46,113 shares of MFS High Yield Municipal Trust (US:CMU) valued at $165,085 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 64,223 shares of MFS High Yield Municipal Trust. This represents a change in shares of -28.20% during the quarter. The current value of the position is $154,940 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 46,113 -18,110 -28.20 165 -26.67 0.0001
2026-02-17 2025-12-31 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 64,223 13,521 26.67 225 31.58 0.0003
2025-11-14 2025-09-30 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 50,702 24,031 90.10 172 94.32 0.0002
2025-09-04 2025-06-30 13F/A-1 MFS HIGH YIELD MUN TR SH BEN INT 59318E102 26,671 -8,368 -23.88 89 -27.87 0.0002
2025-08-13 2025-06-30 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 31,101 -3,938 109 0.0001
2025-05-12 2025-03-31 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 35,039 -27,007 -43.53 122 -44.04 0.0003
2025-06-06 2024-12-31 13F/A-1 MFS HIGH YIELD MUN TR SH BEN INT 59318E102 62,046 4,456 7.74 218 3.32 0.0005
2025-02-07 2024-12-31 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 39,514 -18,076 140 0.0004
2024-11-13 2024-09-30 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 57,590 -1,390 -2.36 211 4.46 0.0005
2024-08-13 2024-06-30 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 58,980 -154,188 -72.33 202 -71.51 0.0005
2024-05-10 2024-03-31 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 213,168 5,616 2.71 710 3.35 0.0016
2024-02-12 2023-12-31 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 207,552 -1,775 -0.85 687 4.73 0.0012
2023-11-13 2023-09-30 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 209,327 10,620 5.34 655 2.50 0.0010
2023-08-21 2023-06-30 13F/A-1 MFS HIGH YIELD MUN TR SH BEN INT 59318E102 198,707 49,356 33.05 640 33.40 0.0011
2023-08-10 2023-06-30 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 198,707 49,356 640 0.0002
2023-05-12 2023-03-31 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 149,351 -8,696 -5.50 479 -3.23 0.0009
2023-02-10 2022-12-31 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 158,047 -304 -0.19 495 3.77 0.0010
2022-11-14 2022-09-30 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 158,351 -40,266 -20.27 477 -28.59 0.0011
2022-08-10 2022-06-30 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 198,617 -62,582 -23.96 668 -33.93 0.0015
2022-05-04 2022-03-31 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 261,199 -12,246 -4.48 1,011 -18.20 0.0020
2022-02-03 2021-12-31 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 273,445 -24,380 -8.19 1,236 -9.58 0.0023
2021-11-05 2021-09-30 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 297,825 -2,801 -0.93 1,367 -4.27 0.0028
2021-08-02 2021-06-30 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 300,626 1,011 0.34 1,428 6.81 0.0031
2021-05-13 2021-03-31 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 299,615 29,380 10.87 1,337 12.35 0.0032
2021-02-10 2020-12-31 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 270,235 19,651 7.84 1,190 13.12 0.0032
2020-11-12 2020-09-30 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 250,584 65,853 35.65 1,052 40.08 0.0031
2020-08-14 2020-06-30 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 184,731 -2,497 -1.33 751 -4.94 0.0025
2020-05-18 2020-03-31 13F MFS HIGH YIELD MUN TR SH BEN INT 59318E102 187,228 187,228 790 0.0032
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.