Latest Period
Q1 2026
Security Snapshot
MFS HIGH YIELD MUNICIPAL TRUST - Common Stock (CMU) Institutional Ownership
CUSIP: 59318E102
13F Institutional Holders and Ownership History from Q1 2014 to Q1 2026
Institutions Reporting
45
Shares (Excl. Options)
12,707,626
Price
$3.58
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- Security type / class
- Equity / Common Stock
- Symbol
- CMU
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 12,707,626
- Total 13F value
- $45,491,444
- Portfolio coverage rank
- 0%
- Share change
- +92,398
- Value change
- +$375,908
- Number of holders
- 45
- Shares outstanding
- 25,385,051
- SEC-reported price per share
- $3.32
- Insider filing price
- $3.32
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- CMU - MFS HIGH YIELD MUNICIPAL TRUST - Common Stock is tracked under CUSIP 59318E102.
- 45 institutions reported positions in Q1 2026.
- 5 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 41 to 45 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $44,273,288 to $45,491,444.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 45 institutions filings for Q1 2026.
Security key
59318E102
Latest holder period
Q1 2026
13F holders
45
13D/G owners
5
CIK / CUSIP context first
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 59318E102:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
5
Security
CMU
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| RIVERNORTH CAPITAL MANAGEMENT, LLC | 12% | +15% | $10,759,658 | +$1,371,825 | 2,955,950 | +15% | RIVERNORTH CAPITAL MANAGEMENT, LLC | 31 Mar 2026 |
| Almitas Capital LLC | 5.9% | 0% | $5,451,694 | -$2,530,615 | 1,497,718 | -32% | Almitas Capital LLC | 31 Mar 2026 |
| CITY OF LONDON INVESTMENT MANAGEMENT CO LTD | 4.8% | $4,109,866 | 1,234,194 | City of London Investment Management Company Limited | 31 Mar 2025 | |||
| SIT INVESTMENT ASSOCIATES INC | 4.1% | -48% | $3,616,876 | -$3,312,255 | 1,045,340 | -48% | Sit Investment Associates, Inc. | 30 Sep 2025 |
| Bulldog Investors, LLP | 1% | -84% | $484,812 | -$5,940,986 | 133,190 | -92% | Phillip Goldstein | 06 May 2026 |
As of 31 Mar 2026, 45 institutional investors reported holding 12,707,626 shares of MFS HIGH YIELD MUNICIPAL TRUST - Common Stock (CMU). This represents 50% of the company’s total 25,385,051 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
49%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| Bulldog Investors, LLP | 14% | 3,531,732 | -1.7% | 2.8% | $12,643,601 |
| RIVERNORTH CAPITAL MANAGEMENT, LLC | 12% | 2,955,950 | +12% | 0.53% | $10,582,301 |
| Almitas Capital LLC | 5.9% | 1,497,718 | 0% | 1.2% | $5,361,830 |
| ICON ADVISERS INC/CO | 2.9% | 731,734 | -11% | 0.61% | $2,619,608 |
| MORGAN STANLEY | 2.8% | 710,702 | +81% | 0% | $2,544,314 |
| CITY OF LONDON INVESTMENT MANAGEMENT CO LTD | 2.7% | 676,122 | +19% | 0.18% | $2,420,517 |
| BANK OF AMERICA CORP /DE/ | 1.6% | 405,971 | 0% | 0% | $1,453,376 |
| Allspring Global Investments Holdings, LLC | 1.5% | 377,111 | 0% | 0% | $1,350,057 |
| Bank of New York Mellon Corp | 1.4% | 354,378 | +11% | 0% | $1,268,675 |
| GUGGENHEIM CAPITAL LLC | 1.2% | 315,595 | 0.01% | $1,129,830 | |
| Lido Advisors, LLC | 0.58% | 146,367 | 0% | 0% | $523,994 |
| UBS Group AG | 0.51% | 129,606 | -46% | 0% | $463,989 |
| MELFA WEALTH MANAGEMENT, INC. | 0.49% | 124,236 | +0.09% | 0.26% | $444,763 |
| Matisse Capital | 0.39% | 98,712 | -62% | 0.15% | $353,389 |
| EVOLVE PRIVATE WEALTH, LLC | 0.36% | 91,331 | -1.4% | 0.02% | $326,965 |
| LPL Financial LLC | 0.24% | 60,315 | +0.54% | 0% | $215,928 |
| OSAIC HOLDINGS, INC. | 0.18% | 46,113 | -28% | 0% | $165,091 |
| RAYMOND JAMES FINANCIAL INC | 0.17% | 43,988 | -8.8% | 0% | $157,478 |
| Equitable Holdings, Inc. | 0.13% | 33,335 | +1.9% | 0% | $117,006 |
| Pathstone Holdings, LLC | 0.12% | 30,929 | 0% | 0% | $110,726 |
| Novak & Powell Financial Services, Inc. | 0.12% | 30,789 | +1.4% | 0.06% | $110,223 |
| Cetera Investment Advisers | 0.12% | 30,249 | 0% | 0% | $108,291 |
| CITADEL ADVISORS LLC | 0.11% | 27,368 | +49% | 0% | $97,977 |
| Cambridge Investment Research Advisors, Inc. | 0.1% | 26,138 | +0.33% | 0% | $94,000 |
| BLUE BELL PRIVATE WEALTH MANAGEMENT, LLC | 0.08% | 20,917 | -0.02% | 0.01% | $74,883 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
49
Latest
Q1 2026
Rows shown
1-25 of 49
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 12,707,626 | $45,491,444 | +$375,908 | $3.58 | 45 |
| 2025 Q4 | 12,615,228 | $44,273,288 | +$1,000,065 | $3.51 | 41 |
| 2025 Q3 | 12,226,392 | $42,418,919 | +$946,743 | $3.47 | 39 |
| 2025 Q2 | 11,973,151 | $39,870,326 | -$476,442 | $3.33 | 38 |
| 2025 Q1 | 12,135,668 | $42,354,332 | +$3,547,407 | $3.49 | 39 |
| 2024 Q4 | 11,118,467 | $39,161,361 | +$6,515,836 | $3.52 | 42 |
| 2024 Q3 | 9,221,748 | $33,794,734 | +$971,393 | $3.66 | 47 |
| 2024 Q2 | 8,983,657 | $30,806,871 | +$677,396 | $3.43 | 52 |
| 2024 Q1 | 8,783,335 | $29,219,055 | -$911,873 | $3.33 | 51 |
| 2023 Q4 | 9,045,712 | $29,941,604 | -$4,180,662 | $3.31 | 50 |
| 2023 Q3 | 10,689,692 | $33,474,788 | +$3,919,146 | $3.13 | 49 |
| 2023 Q2 | 9,431,187 | $30,368,124 | +$4,020,007 | $3.22 | 48 |
| 2023 Q1 | 8,169,887 | $26,220,750 | +$3,115,302 | $3.21 | 46 |
| 2022 Q4 | 7,222,325 | $22,606,284 | +$4,457,101 | $3.13 | 46 |
| 2022 Q3 | 5,777,406 | $17,383,146 | +$1,626,972 | $3.01 | 42 |
| 2022 Q2 | 5,226,511 | $17,581,000 | +$2,703,671 | $3.36 | 44 |
| 2022 Q1 | 4,402,586 | $17,035,000 | +$3,934,341 | $3.87 | 38 |
| 2021 Q4 | 3,383,802 | $15,285,000 | +$2,224,381 | $4.52 | 36 |
| 2021 Q3 | 2,848,595 | $13,074,000 | +$3,286,914 | $4.59 | 34 |
| 2021 Q2 | 2,131,877 | $10,117,000 | -$2,086,090 | $4.75 | 29 |
| 2021 Q1 | 2,596,077 | $11,589,000 | +$1,254,885 | $4.46 | 33 |
| 2020 Q4 | 2,294,011 | $10,083,000 | +$1,923,319 | $4.40 | 33 |
| 2020 Q3 | 1,855,611 | $7,793,000 | -$598,639 | $4.20 | 29 |
| 2020 Q2 | 2,004,788 | $8,166,000 | +$459,050 | $4.07 | 28 |
| 2020 Q1 | 1,893,229 | $7,991,000 | -$580,434 | $4.22 | 26 |