MFS HIGH YIELD MUN TR

Historical 13F Holders

Symbol: CMU
CUSIP: 59318E102
All holders as of: Q1 2026
Type: Equity
Class: SH BEN INT

Reported Value, Excluding Options

Total Filings

13D/G Filers

Investors who own more than 5% of a class must file a Schedule 13D or 13G. Every filing for 59318E102 since 12/18/2024, newest first.

Filer	% of Class	Shares	Form	Filed
Almitas Capital LLC 13G/A Amendment 2	0%	0	13G/A Amendment 2	8/21/2026 Event 6/30/2026
Almitas Capital LLC 13G/A Amendment 1	5.9%	1,497,718	13G/A Amendment 1	5/18/2026 Event 3/31/2026
Rivernorth Capital Management, LLC 13G/A Amendment 3	11.6%	2,955,950	13G/A Amendment 3	5/15/2026 Event 3/31/2026
Bulldog Investors, LLP 13D/A Amendment 14	1.0%	133,190	13D/A Amendment 14	5/12/2026 Event 5/6/2026
Bulldog Investors, LLP	0.8%	100,155
Phillip Goldstein	1.0%	133,190
Andrew Dakos	0.7%	90,245
Bulldog Investors, LLP 13D/A Amendment 13	6.9%	1,765,329	13D/A Amendment 13	5/5/2026 Event 5/1/2026
Bulldog Investors, LLP	5.4%	1,382,344
Phillip Goldstein	6.9%	1,765,329
Andrew Dakos	4.97%	1,267,456
Bulldog Investors, LLP 13D/A Amendment 12	11.2%	2,842,378	13D/A Amendment 12	5/1/2026 Event 4/29/2026
Bulldog Investors, LLP	9.7%	2,459,393
Phillip Goldstein	11.2%	2,842,378
Andrew Dakos	9.2%	2,344,505
Bulldog Investors, LLP 13D/A Amendment 11	12.5%	3,197,146	13D/A Amendment 11	4/27/2026 Event 4/23/2026
Bulldog Investors, LLP	11.0%	2,814,161
Phillip Goldstein	12.5%	3,197,146
Andrew Dakos	10.6%	2,699,273
Bulldog Investors, LLP 13D/A Amendment 10	13.6%	3,455,205	13D/A Amendment 10	4/9/2026 Event 4/7/2026
Bulldog Investors, LLP	12.1%	3,072,220
Phillip Goldstein	13.6%	3,455,205
Andrew Dakos	11.6%	2,957,332
Almitas Capital LLC 13G	5.9%	2,192,942	13G	2/17/2026 Event 12/31/2025
Bulldog Investors, LLP 13D/A Amendment 9	15.7%	4,007,921	13D/A Amendment 9	12/16/2025 Event 12/12/2025
Bulldog Investors, LLP	14.4%	3,671,536
Phillip Goldstein	15.7%	4,007,921
Andrew Dakos	14.0%	3,561,726
Almitas Capital LLC 13G	5.9%	1,507,168	13G	11/14/2025 Event 9/30/2025
Bulldog Investors, LLP 13D/A Amendment 8	14.3%	3,631,503	13D/A Amendment 8	11/14/2025 Event 11/12/2025
Bulldog Investors, LLP	12.9%	3,295,118
Phillip Goldstein	14.3%	3,631,503
Andrew Dakos	12.5%	3,185,308
Rivernorth Capital Management, LLC 13G/A Amendment 2	10.1%	2,579,075	13G/A Amendment 2	10/7/2025 Event 9/30/2025
Sit Investment Associates, Inc. 13G/A Amendment 1	4.1%	1,045,340	13G/A Amendment 1	10/2/2025 Event 9/30/2025
Sit Investment Associates, Inc.	4.1%	1,045,340
Sit Fixed Income Advisors II, LLC	4.1%	1,045,340
Bulldog Investors, LLP 13D/A Amendment 7	13.1%	3,342,968	13D/A Amendment 7	8/28/2025 Event 8/26/2025
Bulldog Investors, LLP	11.8%	3,006,546
Phillip Goldstein	13.1%	3,342,968
Andrew Dakos	11.4%	2,896,773
Bulldog Investors, LLP 13D/A Amendment 6	12.1%	3,076,451	13D/A Amendment 6	7/16/2025 Event 7/15/2025
Bulldog Investors, LLP	10.6%	2,695,237
Phillip Goldstein	12.1%	3,076,451
Andrew Dakos	10.5%	2,671,037
Rivernorth Capital Management, LLC 13G/A Amendment 1	7.5% Checked 5% or less	1,914,727	13G/A Amendment 1	5/15/2025 Event 3/31/2025
City of London Investment Management Co Ltd 13G/A Amendment 1	4.8%	1,234,194	13G/A Amendment 1	4/4/2025 Event 3/31/2025
Bulldog Investors, LLP 13D/A Amendment 5	11.3%	2,876,902	13D/A Amendment 5	2/14/2025 Event 12/31/2024
Bulldog Investors, LLP	11.3%	2,876,902
Phillip Goldstein	11.3%	2,876,902
Andrew Dakos	10.1%	2,573,197
Sit Investment Associates, Inc. 13G	7.9%	2,002,639	13G	1/3/2025 Event 12/31/2024
Sit Investment Associates, Inc.	7.9%	2,002,639
Sit Fixed Income Advisors II, LLC	7.9%	2,002,639

13F Holders by Quarter

Period	Filings	Shares, Excl. Options	Value, Excl. Options	Options Value
2026 Q1	45	12.7 M	$45.5 M	$0
2025 Q4	41	12.6 M	$44.3 M	$0
2025 Q3	40	13.7 M	$47.6 M	$0
2025 Q2	40	12.0 M	$39.9 M	$0
2025 Q1	41	12.1 M	$42.4 M	$0
2024 Q4	43	11.1 M	$39.2 M	$0
2024 Q3	49	9.27 M	$46.5 M	$0
2024 Q2	54	9.08 M	$31.1 M	$0
2024 Q1	54	9.05 M	$30.1 M	$0
2023 Q4	53	9.22 M	$30.4 M	$0
2023 Q3	50	10.7 M	$33.5 M	$0
2023 Q2	50	9.43 M	$30.4 M	$0
2023 Q1	48	8.17 M	$26.2 M	$0
2022 Q4	50	7.61 M	$23.7 M	$0
2022 Q3	45	5.78 M	$17.4 M	$0
2022 Q2	49	5.24 M	$17.6 M	$0
2022 Q1	40	4.40 M	$17.0 M	$0
2021 Q4	38	3.38 M	$15.3 M	$0
2021 Q3	35	2.85 M	$13.1 M	$0
2021 Q2	31	2.18 M	$10.3 M	$0
2021 Q1	35	2.64 M	$11.8 M	$0
2020 Q4	35	2.34 M	$10.3 M	$0
2020 Q3	31	1.91 M	$8.00 M	$0
2020 Q2	31	2.06 M	$8.41 M	$0
2020 Q1	26	1.89 M	$7.99 M	$0
2019 Q4	32	2.00 M	$9.53 M	$0
2019 Q3	33	2.19 M	$10.3 M	$0
2019 Q2	29	2.30 M	$10.9 M	$0
2019 Q1	30	2.66 M	$14.7 M	$0
2018 Q4	37	2.05 M	$8.54 M	$0
2018 Q3	32	1.92 M	$22.4 M	$0
2018 Q2	31	2.04 M	$9.19 M	$0
2018 Q1	28	1.98 M	$8.84 M	$0
2017 Q4	30	1.84 M	$8.49 M	$0
2017 Q3	28	1.20 M	$5.71 M	$0
2017 Q2	30	1.66 M	$7.81 M	$0
2017 Q1	29	1.82 M	$8.39 M	$0
2016 Q4	27	1.84 M	$8.13 M	$0
2016 Q3	27	1.49 M	$7.51 M	$0
2016 Q2	30	1.47 M	$7.23 M	$0
2016 Q1	28	1.18 M	$5.71 M	$0
2015 Q4	28	1.38 M	$6.22 M	$0
2015 Q3	28	1.11 M	$4.86 M	$0
2015 Q2	30	1.18 M	$4.84 M	$0
2015 Q1	28	1.11 M	$4.90 M	$0
2014 Q4	34	1.47 M	$6.47 M	$0
2014 Q3	29	1.75 M	$7.58 M	$0
2014 Q2	27	2.00 M	$8.64 M	$0
2014 Q1	22	2.13 M	$9.39 M	$0