Filer Snapshot

MFS HIGH YIELD MUNICIPAL TRUST

CIK 0000809844. SEC filing timeline plus parsed ownership intelligence from 13F, 13D/G, and Forms 3/4/5 where available.

Entity type

Company

Total filings

548

Latest filing

18 May 2026

Industry

n/a

Filing-backed research brief

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Latest signal: SEC filing timeline only. Each card links back to the PortfolioSavvy page where the filing evidence is closest.

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Largest parsed holding

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Populates from the latest parsed 13F information table.

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13D/G large stake

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No recent parsed 13D/G stake row for this CIK.

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Source: SEC Schedule 13D/G

SCHEDULE 13G/A filed on 18 May 2026 for CIK 0000809844.

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Identity
Public symbols
CMU on NYSE
Business address
111 Huntington Avenue, 24 Th Floor, Boston, MA, 02199
SEC record
State of incorporation
MA
Fiscal year end
30 November
Former names
COLONIAL MUNICIPAL INCOME TRUST (to 02 May 2007)

Filer intelligence

What SEC filings say about MFS HIGH YIELD MUNICIPAL TRUST

A compact read of parsed XML filings. 13F, 13D/G, and Forms 3/4/5 are shown separately because they answer different ownership questions.

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SEC source mix

Counts show available parsed rows, not one combined ownership total.

No XML rows yet
13F portfolio No rows yet

Quarterly institutional portfolio holdings.

13D/G stakes No rows yet

Beneficial ownership and large-stake disclosures.

Forms 3/4/5 No rows yet

Officer, director, and 10% owner holdings or transactions.

No parsed ownership summary yet

We still show the SEC filing timeline below. The intelligence summary will populate when parsed 13F, 13D/G, or Forms 3/4/5 data exists for this CIK.

SEC filing record

CIK 0000809844 filing coverage

Start with this filing record, then use the linked ownership pages when parsed 13F, 13D/G, Forms 3/4/5, or facts data exists for this CIK.

SEC filings
548
First seen
31 Jan 1994
Latest filing
18 May 2026
Entity
Company

Observed form types

SCHEDULE 13G/A SCHEDULE 13D/A SC TO-I/A 4 NPORT-P SC TO-I N-23C-2 SC TO-C SCHEDULE 13G N-CEN +29 more

Primary evidence

Open SEC filing index MFS HIGH YIELD MUNICIPAL TRUST SEC filings MFS HIGH YIELD MUNICIPAL TRUST insider transactions CMU holder history

Latest Filings

Showing the latest 12 of 366 SEC filings for MFS HIGH YIELD MUNICIPAL TRUST.

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SCHEDULE 13G/A File 005-84331

SCHEDULE 13G/A filing

Filing date
18 May 2026
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
SCHEDULE 13G/A File 005-84331

SCHEDULE 13G/A filing

Filing date
15 May 2026
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
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SCHEDULE 13D/A File 005-84331

SCHEDULE 13D/A filing

Filing date
12 May 2026
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
SC TO-I/A File 005-84331

SC TO-I/A filing

Filing date
11 May 2026
Reporting date
Not listed
Next action
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SC TO-I/A File 005-84331

SC TO-I/A filing

Filing date
06 May 2026
Reporting date
Not listed
Next action
Verify source filing
SCHEDULE 13D/A File 005-84331

SCHEDULE 13D/A filing

Filing date
05 May 2026
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
SCHEDULE 13G/A File 005-84331

SCHEDULE 13G/A filing

Filing date
05 May 2026
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
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4

4

Filing date
05 May 2026
Reporting date
01 May 2026
SEC evidence
Open document Open filing
Next action
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SCHEDULE 13D/A File 005-84331

SCHEDULE 13D/A filing

Filing date
01 May 2026
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
SCHEDULE 13D/A File 005-84331

SCHEDULE 13D/A filing

Filing date
27 Apr 2026
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
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NPORT-P File 811-04992

NPORT-P filing

Filing date
24 Apr 2026
Reporting date
28 Feb 2026
SEC evidence
Open document Open filing
Next action
Verify source filing
SCHEDULE 13D/A File 005-84331

SCHEDULE 13D/A filing

Filing date
09 Apr 2026
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
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