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

Latest Period

Q4 2025

Institutions Reporting

41

Shares (Excl. Options)

12,615,228

Price

$3.51

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Type / Class
Equity / Common Stock
Symbol
CMU on NYSE
Shares outstanding
25,492,179
Price per share
$3.64
All holders as of 31 Dec 2025
Q4 2025
Total 13F shares
12,615,228
Total reported value
$44,273,288
% of total 13F portfolios
0%
Share change
+283,142
Value change
+$1,000,065
Number of holders
41
Price from insider filings
$3.64
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Quick Takeaways

  • CMU - MFS HIGH YIELD MUNICIPAL TRUST - Common Stock is tracked under CUSIP 59318E102.
  • 41 institutions reported positions in Q4 2025.
  • 5 significant owners is listed from Schedule 13D/13G reporting.

What Changed

  • Holder count moved from 41 to 10 between Q4 2025 and Q1 2026.
  • Reported value moved from $44,273,288 to $1,071,700.

Why This Matters

  • 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.

Source Evidence

Source: SEC Form 13F

Latest holder context comes from 41 institutions filings for Q4 2025.

Open SEC Evidence

Investment Quick Answers

What is CUSIP 59318E102?
CUSIP 59318E102 identifies CMU - MFS HIGH YIELD MUNICIPAL TRUST - Common Stock in SEC 13F datasets.

Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.

Significant Owners of MFS HIGH YIELD MUNICIPAL TRUST - Common Stock (CMU) based on Schedule 13D/G filings

Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
Bulldog Investors, LLP 11% -11% $10,346,256 -$1,291,356 2,842,378 -11% Phillip Goldstein 29 Apr 2026
RIVERNORTH CAPITAL MANAGEMENT, LLC 10% +33% $8,923,600 +$2,298,644 2,579,075 +35% RIVERNORTH CAPITAL MANAGEMENT, LLC 30 Sep 2025
Almitas Capital LLC 5.9% 0% $7,741,085 +$2,420,782 2,192,942 +46% Almitas Capital LLC 31 Dec 2025
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

As of 31 Dec 2025, 41 institutional investors reported holding 12,615,228 shares of MFS HIGH YIELD MUNICIPAL TRUST - Common Stock (CMU). This represents 49% of the company’s total 25,492,179 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of MFS HIGH YIELD MUNICIPAL TRUST - Common Stock (CMU) together control 49% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.

Institution Ownership % Shares Held Share Change % Portfolio % Holdings Value
Bulldog Investors, LLP 14% 3,593,657 +20% 2.8% $12,613,736
RIVERNORTH CAPITAL MANAGEMENT, LLC 10% 2,630,896 +2% 0.44% $9,234,445
Almitas Capital LLC 5.9% 1,497,718 -0.63% 1.2% $5,256,990
ICON ADVISERS INC/CO 3.2% 821,456 0% 0.62% $2,883,311
CITY OF LONDON INVESTMENT MANAGEMENT CO LTD 2.2% 568,249 +9.6% 0.15% $1,994,554
Thomas J. Herzfeld Advisors, Inc. 2.2% 558,611 +2.2% 0.66% $1,960,725
BANK OF AMERICA CORP /DE/ 1.6% 405,971 +175% 0% $1,424,958
MORGAN STANLEY 1.5% 391,611 +306% 0% $1,374,556
Allspring Global Investments Holdings, LLC 1.5% 377,111 0% 0% $1,323,660
Bank of New York Mellon Corp 1.2% 318,415 +1.9% 0% $1,117,638
Matisse Capital 1% 262,208 0% 0.41% $920,350
UBS Group AG 0.94% 238,830 -4.2% 0% $838,294
Lido Advisors, LLC 0.57% 146,367 0% 0% $507,893
MELFA WEALTH MANAGEMENT, INC. 0.49% 124,123 +0.09% 0.25% $435,671
EVOLVE PRIVATE WEALTH, LLC 0.36% 92,603 0% 0.02% $325,037
OSAIC HOLDINGS, INC. 0.25% 64,223 +27% 0% $225,426
LPL Financial LLC 0.24% 59,992 -0.78% 0% $210,572
RAYMOND JAMES FINANCIAL INC 0.19% 48,217 -0.1% 0% $169,242
SIT INVESTMENT ASSOCIATES INC 0.19% 47,357 -95% 0% $166,000
Equitable Holdings, Inc. 0.13% 32,724 +0.94% 0% $114,861
Pathstone Holdings, LLC 0.12% 30,929 +12% 0% $108,561
Novak & Powell Financial Services, Inc. 0.12% 30,365 0.06% $106,580
Cetera Investment Advisers 0.12% 30,249 -15% 0% $106,174
Cambridge Investment Research Advisors, Inc. 0.1% 26,051 +0.34% 0% $91,000
Mutual Advisors, LLC 0.08% 20,998 0% $73,703

Institutional Holders of MFS HIGH YIELD MUNICIPAL TRUST - Common Stock (CMU) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2026 Q1 299,311 $1,071,700 -$129,245 $3.58 10
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
2019 Q4 1,996,352 $9,528,000 -$873,839 $4.73 30
2019 Q3 2,193,254 $10,285,000 -$526,154 $4.69 32
2019 Q2 2,304,619 $10,932,334 -$228,157 $4.73 28
2019 Q1 2,346,873 $10,913,806 +$1,492,246 $4.65 28
2018 Q4 2,049,010 $8,542,000 -$6,925 $4.17 36
2018 Q3 1,923,501 $8,751,650 -$507,608 $4.55 31
2018 Q2 2,037,408 $9,188,000 +$244,788 $4.51 31
2018 Q1 1,984,068 $8,835,000 +$616,319 $4.45 28
2017 Q4 1,836,920 $8,485,000 +$1,764,614 $4.62 30
2017 Q3 1,201,760 $5,709,000 -$1,990,049 $4.75 28
2017 Q2 1,663,030 $7,807,000 -$390,923 $4.70 29
2017 Q1 1,746,006 $8,065,000 +$99,142 $4.62 27
2016 Q4 1,726,494 $7,638,000 +$1,046,696 $4.42 24
2016 Q3 1,486,206 $7,505,857 +$203,955 $5.06 26
2016 Q2 1,469,407 $7,226,835 +$1,412,219 $4.92 29
2016 Q1 1,181,770 $5,709,000 -$869,046 $4.82 26
2015 Q4 1,377,061 $6,223,000 +$991,015 $4.51 27
2015 Q3 1,110,903 $4,860,000 -$268,987 $4.37 27
2015 Q2 1,174,962 $4,834,507 +$347,150 $4.11 29
2015 Q1 1,105,401 $4,897,936 -$1,602,123 $4.43 28
2014 Q4 1,472,061 $6,467,955 -$454,681 $4.39 34
2014 Q3 1,748,727 $7,583,008 -$1,710,238 $4.34 29
2014 Q2 1,971,057 $8,516,465 -$652,137 $4.32 26
2014 Q1 2,123,027 $9,380,545 -$108,048 $4.41 21
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