MFS HIGH YIELD MUNICIPAL TRUST N-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF

REGISTERED MANAGEMENT INVESTMENT COMPANIES

Investment Company Act file number 811-4992

MFS HIGH YIELD MUNICIPAL TRUST

(Exact name of registrant as specified in charter)

500 Boylston Street, Boston, Massachusetts 02116

(Address of principal executive offices) (Zip code)

Susan S. Newton

Massachusetts Financial Services Company

500 Boylston Street

Boston, Massachusetts 02116

(Name and address of agents for service)

Registrant’s telephone number, including area code: (617) 954-5000

Date of fiscal year end: November 30

Date of reporting period: February 28, 2010


ITEM 1. SCHEDULE OF INVESTMENTS.


LOGO


MFS High Yield Municipal Trust

PORTFOLIO OF INVESTMENTS (Unaudited) 2/28/10

 

Issuer

   Shares/Par    Value ($)

Municipal Bonds – 158.8%

     

Airport & Port Revenue – 4.6%

     

Branson, MO, Regional Airport Transportation Development District Airport Rev., “B”, 6%, 2037

   $ 460,000    $ 300,665

Dallas Fort Worth, TX, International Airport Rev. Improvement, “B”, AGM, 5%, 2025

     3,000,000      3,048,390

Maryland Economic Development Corp. Rev. (Terminal Project), “B”, 5.75%, 2035

     285,000      290,341

New York, NY, City Industrial Development Authority Rev. (Terminal One Group Assn.), 5.5%, 2021

     500,000      509,685

Port Authority NY & NJ, Cons Thirty Seventh, AGM, 5.125%, 2030

     1,450,000      1,462,833
         
      $ 5,611,914
         

General Obligations - General Purpose – 0.7%

     

Commonwealth of Puerto Rico Government Development Bank, “B”, 5%, 2015

   $ 400,000    $ 421,792

Luzerne County, PA, AGM, 6.75%, 2023

     455,000      491,828
         
      $ 913,620
         

General Obligations - Improvement – 0.3%

     

Guam Government, “A”, 6.75%, 2029

   $ 140,000    $ 149,104

Guam Government, “A”, 7%, 2039

     160,000      171,861
         
      $ 320,965
         

General Obligations - Schools – 2.1%

     

Beverly Hills, CA, Unified School District (Election of 2008), 0%, 2029

   $ 2,195,000    $ 783,220

Beverly Hills, CA, Unified School District, Capital Appreciation (Election of 2008), 0%, 2031

     275,000      85,170

Beverly Hills, CA, Unified School District, Capital Appreciation (Election of 2008), 0%, 2032

     280,000      80,856

Beverly Hills, CA, Unified School District, Capital Appreciation (Election of 2008), 0%, 2033

     560,000      151,603

Irving, TX, Independent School District, “A”, PSF, 0%, 2016

     1,000,000      839,600

Los Angeles, CA, Unified School District, “D”, 5%, 2034

     165,000      166,952

San Jacinto, TX, Community College District, 5.125%, 2038

     430,000      447,492
         
      $ 2,554,893
         

Healthcare Revenue - Hospitals – 37.2%

     

Allegheny County, PA, Hospital Development Authority Rev. (University of Pittsburgh Medical Center), “A”, 5.375%, 2029

   $ 440,000    $ 452,628

Allegheny County, PA, Hospital Development Authority Rev. (West Penn Allegheny Health), “A”, 5%, 2028

     435,000      341,949

Allegheny County, PA, Hospital Development Authority Rev. (West Penn Allegheny Health), “A”, 5.375%, 2040

     625,000      468,681

Atchison, KS, Hospital Rev. (Atchison Hospital Assn.), “A”, 6.75%, 2030

     320,000      304,362

Birmingham, AL, Baptist Medical Center, Special Care Facilities Rev. (Baptist Health Systems, Inc.), “A”, 5%, 2030

     500,000      424,325

Brunswick, GA, Hospital Authority Rev. (Glynn-Brunswick Memorial Hospital), 5.625%, 2034

     170,000      174,746

California Health Facilities Financing Authority Rev. (St. Joseph Health System), “A”, 5.75%, 2039

     185,000      192,430

California Health Facilities Financing Authority Rev. (Sutter Health), “A”, 5%, 2042

     500,000      460,055

California Statewide Communities Development Authority Rev. (Catholic Healthcare West), “K”, ASSD GTY, 5.5%, 2041

     625,000      637,400

California Statewide Communities Development Authority Rev. (Catholic Healthcare West), “L”, ASSD GTY, 5.25%, 2041

     870,000      871,505

California Statewide Communities Development Authority Rev. (Children’s Hospital), 5%, 2047

     290,000      247,695

California Statewide Communities Development Authority Rev. (St. Joseph Health System), FGIC, 5.75%, 2047

     635,000      652,697

Cullman County, AL, Health Care Authority (Cullman Regional Medical Center), “A”, 6.75%, 2029

     60,000      61,242

Delaware County, PA, Authority Rev. (Mercy Health Corp.), ETM, 6%, 2016 (c)

     965,000      1,002,394

Delaware County, PA, Authority Rev. (Mercy Health Corp.), ETM, 6%, 2026 (c)

     500,000      571,990

 

1


MFS High Yield Municipal Trust

PORTFOLIO OF INVESTMENTS (Unaudited) 2/28/10 - continued

 

Issuer

   Shares/Par    Value ($)

Municipal Bonds – continued

     

Healthcare Revenue - Hospitals – continued

     

Erie County, PA, Hospital Authority Rev. (St. Vincent’s Health), “A”, 7%, 2027

   $ 410,000    $ 412,107

Garden City, MI, Hospital Finance Authority Rev. (Garden City Hospital), 5%, 2038

     500,000      317,820

Genesee County, NY, Industrial Development Agency Civic Facility Rev. (United Memorial Medical Center), 5%, 2027

     90,000      75,897

Harris County, TX, Health Facilities Development Corp., Hospital Rev. (Memorial Hermann Healthcare Systems), “B”, 7.25%, 2035

     205,000      231,439

Idaho Health Facilities Authority Rev. (IHC Hospitals, Inc.), ETM, 6.65%, 2021 (c)(f)

     2,750,000      3,546,263

Illinois Finance Authority Rev. (Children’s Memorial Hospital), “A”, ASSD GTY, 5.25%, 2047

     870,000      834,278

Illinois Finance Authority Rev. (Edward Hospital), “A”, AMBAC, 5.5%, 2040

     1,090,000      1,082,032

Illinois Finance Authority Rev. (Kewanee Hospital), 5.1%, 2031

     410,000      320,727

Illinois Finance Authority Rev. (Provena Health), “A”, 7.75%, 2034

     485,000      553,802

Illinois Finance Authority Rev. (Silver Cross Hospital & Medical Centers), 6.875%, 2038

     485,000      502,863

Indiana Health & Educational Facilities Finance Authority Rev. (Sisters of St. Francis Health Services, Inc.), “E”, AGM, 5.25%, 2041

     660,000      665,617

Indiana Health & Educational Facilities Finance Authority, Hospital Rev. (Clarian Health), “A”, 5%, 2039

     1,745,000      1,588,055

Indiana Health & Educational Facilities Finance Authority, Hospital Rev. (Community Foundation of Northwest Indiana), 5.5%, 2037

     1,060,000      1,012,851

Indiana Health & Educational Financing Authority Rev. (Community Foundation of Northwest Indiana ), “A”, 6%, 2034

     425,000      432,042

Johnson City, TN, Health & Educational Facilities Board Hospital Rev. (Mountain States Health), “A”, 5.5%, 2031

     1,120,000      1,100,590

Johnson City, TN, Health & Educational Facilities Board Hospital Rev. (Mountain States Health), “A”, 5.5%, 2036

     410,000      399,947

Kentucky Economic Development Finance Authority, Hospital Facilities Rev. (Baptist Healthcare System), “A”, 5.375%, 2024

     300,000      322,890

Kentucky Economic Development Finance Authority, Hospital Facilities Rev. (Baptist Healthcare System), “A”, 5.625%, 2027

     100,000      107,543

Kentucky Economic Development Finance Authority, Hospital Facilities Rev. (Baptist Healthcare System), “A”, 6.375%, 2040

     570,000      565,771

Lake County, OH, Hospital Facilities Rev. (Lake Hospital Systems, Inc.), 5.625%, 2029

     435,000      417,369

Lebanon County, PA, Health Facilities Authority Rev. (The Good Samaritan Hospital of Lebanon), 5.9%, 2028

     210,000      193,051

Louisiana Public Facilities Authority Hospital Rev. (Lake Charles Memorial Hospital), 6.375%, 2034

     830,000      724,673

Louisville & Jefferson County, KY, Metro Government Health Facilities Rev. (Jewish Hospital & St. Mary’s Healthcare), 6.125%, 2037

     1,315,000      1,368,784

Louisville & Jefferson County, KY, Metropolitan Government Healthcare Systems Rev.

     

(Norton Healthcare, Inc.), 5.25%, 2036

     1,265,000      1,219,321

Lufkin, TX, Health Facilities Development Corp. Rev. (Memorial Health System), 5.5%, 2032

     60,000      55,949

Lufkin, TX, Health Facilities Development Corp. Rev. (Memorial Health System), 5.5%, 2037

     60,000      53,386

Maryland Health & Higher Educational Facilities Authority Rev. (Anne Arundel Health System), “A”, 6.75%, 2039

     735,000      838,128

Maryland Health & Higher Educational Facilities Authority Rev. (Washington County Hospital), 6%, 2043

     120,000      119,476

Massachusetts Health & Educational Facilities Authority Rev. (Boston Medical Center), 5.25%, 2038

     1,000,000      883,160

Massachusetts Health & Educational Facilities Authority Rev. (Jordan Hospital), “E”, 6.75%, 2033

     250,000      227,088

Massachusetts Health & Educational Facilities Authority Rev. (Milford-Whitinsville Hospital), “C”, 5.25%, 2018

     500,000      465,270

Massachusetts Health & Educational Facilities Authority Rev. (Quincy Medical Center), “A”, 6.5%, 2038

     340,000      302,614

 

2


MFS High Yield Municipal Trust

PORTFOLIO OF INVESTMENTS (Unaudited) 2/28/10 - continued

 

Issuer

   Shares/Par    Value ($)

Municipal Bonds – continued

     

Healthcare Revenue - Hospitals – continued

     

Montgomery, AL, Medical Clinic Board Health Care Facility Rev. (Jackson Hospital & Clinic), 5.25%, 2031

   $ 125,000    $ 114,588

Montgomery, AL, Medical Clinic Board Health Care Facility Rev. (Jackson Hospital & Clinic), 5.25%, 2036

     825,000      747,062

New Hampshire Business Finance Authority Rev. (Elliot Hospital Obligated Group), “A”, 6%, 2027

     585,000      593,044

New Hampshire Health & Education Facilities Authority Rev. (Catholic Medical Center), “A”, 6.125%, 2012 (c)

     175,000      197,990

New Hampshire Health & Education Facilities Authority Rev. (Catholic Medical Center), “A”, 6.125%, 2032

     25,000      24,952

New Hampshire Health & Educational Facilities Authority Rev. (Memorial Hospital at Conway), 5.25%, 2021

     530,000      510,777

New Hanover County, N.C., Hospital Rev., AGM, 5.125%, 2031

     895,000      915,710

New Jersey Health Care Facilities, Financing Authority Rev. (St. Peter’s University Hospital), 5.75%, 2037

     545,000      544,204

New Mexico Hospital Equipment Loan Council, Hospital Rev. (Rehoboth McKinley Christian Hospital), “A”, 5%, 2017

     285,000      252,741

New York Dormitory Authority Rev., Non-State Supported Debt (Bronx-Lebanon Hospital Center), LOC, 6.5%, 2030

     190,000      210,645

New York Dormitory Authority Rev., Non-State Supported Debt (Bronx-Lebanon Hospital Center), LOC, 6.25%, 2035

     115,000      125,181

Norman, OK, Regional Hospital Authority Rev., 5%, 2027

     155,000      128,786

Norman, OK, Regional Hospital Authority Rev., 5.375%, 2029

     90,000      76,347

Norman, OK, Regional Hospital Authority Rev., 5.375%, 2036

     235,000      187,836

Norman, OK, Regional Hospital Authority Rev., 5.125%, 2037

     415,000      317,732

Olympia, WA, Healthcare Facilities Authority Rev. (Catholic Health Initiatives), “D”, 6.375%, 2036

     1,095,000      1,193,353

Orange County, FL, Health Facilities Authority Hospital Rev. (Orlando Regional Healthcare), 5.75%, 2012 (c)

     150,000      169,895

Palomar Pomerado Health Care District, CA, COP, 6.75%, 2039

     1,010,000      1,039,462

Philadelphia, PA, Hospitals & Higher Education Facilities Authority Rev. (Temple University Health System), “A”, 6.625%, 2023

     375,000      375,034

Philadelphia, PA, Hospitals & Higher Education Facilities Authority Rev. (Temple University Health System), “A”, 5.5%, 2030

     480,000      425,731

Rhode Island Health & Educational Building Corp. Rev., Hospital Financing (Lifespan Obligated Group), “A”, ASSD GTY, 7%, 2039

     660,000      740,282

Royal Oak, MI, Hospital Finance Authority Rev. (William Beaumont Hospital), 8.25%, 2039

     485,000      575,632

Salida, CO, Hospital District Rev., 5.25%, 2036

     735,000      582,943

Skagit County, WA, Public Hospital District No. 001 Rev. (Skagit Valley Hospital), 5.75%, 2032

     90,000      89,991

South Lake County, FL, Hospital District Rev. (South Lake Hospital), “A”, 6%, 2029

     85,000      86,362

South Lake County, FL, Hospital District Rev. (South Lake Hospital), “A”, 6.25%, 2039

     125,000      127,068

South Lake County, FL, Hospital District Rev. (South Lake Hospital), 6.375%, 2034

     250,000      253,283

Southwestern, IL, Development Authority Rev. (Anderson Hospital), 5.375%, 2015

     500,000      501,120

Southwestern, IL, Development Authority Rev. (Anderson Hospital), 5.5%, 2020

     550,000      539,292

Southwestern, IL, Development Authority Rev. (Anderson Hospital), 5.125%, 2026

     500,000      459,050

Sullivan County, TN, Health, Educational & Housing Facilities Board Hospital Rev. (Wellmont Health Systems Project), “C”, 5.25%, 2036

     1,085,000      968,482

Tyler, TX, Health Facilities Development Corp. (East Texas Medical Center), “A”, 5.25%, 2032

     230,000      211,158

Tyler, TX, Health Facilities Development Corp. (East Texas Medical Center), “A”, 5.375%, 2037

     190,000      173,810

Virginia Small Business Financing Authority Hospital Rev. (Wellmont Health Project), “A”, 5.25%, 2037

     470,000      418,770

 

3


MFS High Yield Municipal Trust

PORTFOLIO OF INVESTMENTS (Unaudited) 2/28/10 - continued

 

Issuer

   Shares/Par    Value ($)

Municipal Bonds – continued

     

Healthcare Revenue - Hospitals – continued

     

Washington Health Care Facilities Authority Rev. (Multicare Health Systems), “B”, ASSD GTY, 6%, 2039

   $ 440,000    $ 467,694

West Contra Costa, CA, Healthcare District, AMBAC, 5.5%, 2029

     105,000      107,136

Wisconsin Health & Educational Facilities Authority Rev. (Aurora Health Care, Inc.), 6.4%, 2033

     350,000      356,979

Wisconsin Health & Educational Facilities Authority Rev. (Fort Healthcare, Inc.), 6.1%, 2034

     750,000      755,940

Wisconsin Health & Educational Facilities Authority Rev. (Wheaton Franciscan Services), 5.75%, 2012 (c)

     450,000      498,654

Wisconsin Health & Educational Facilities Authority Rev. (Wheaton Franciscan Services), 5.25%, 2034

     935,000      850,083

Wisconsin Health & Educational Facilities Authority Rev. (Wheaton Franciscan Services), “A”, 5.25%, 2025

     390,000      368,675
         
      $ 45,088,376
         

Healthcare Revenue - Long Term Care – 27.2%

     

ABAG Finance Authority for Non-Profit Corps. (Casa de las Campanas), 6%, 2037

   $ 90,000    $ 89,879

Abilene, TX, Health Facilities Development Corp., Retirement Facilities Rev. (Sears Methodist Retirement), “A”, 5.9%, 2025

     750,000      609,330

Abilene, TX, Health Facilities Development Corp., Retirement Facilities Rev. (Sears Methodist Retirement), “A”, 7%, 2033

     200,000      173,752

Boston, MA, Industrial Development Financing Authority Rev. (Springhouse, Inc.), 5.875%, 2020

     235,000      224,902

Bucks County, PA, Industrial Development Authority Retirement Community Rev. (Ann’s Choice, Inc.), “A”, 6.125%, 2025

     500,000      466,515

Bucks County, PA, Industrial Development Authority Retirement Community Rev. (Ann’s Choice, Inc.), “A”, 6.25%, 2035

     250,000      224,800

Bucks County, PA, Industrial Development Authority Rev. (Lutheran Community Telford Center), 5.75%, 2027

     90,000      76,059

Bucks County, PA, Industrial Development Authority Rev. (Lutheran Community Telford Center), 5.75%, 2037

     120,000      94,159

California Statewide Communities Development Authority Rev. (American Baptist Homes of the West), 6.25%, 2039

     215,000      210,171

California Statewide Communities Development Authority Rev. (Eskaton Properties, Inc.), 8.25%, 2010 (c)

     695,000      739,327

Capital Projects Finance Authority, FL (Glenridge on Palmer Ranch), “A”, 8%, 2012 (c)

     500,000      584,665

Chartiers Valley, PA, Industrial & Commercial Development Authority (Friendship Village), “A”, 5.75%, 2020

     1,000,000      993,770

Chartiers Valley, PA, Industrial & Commercial Development Authority Rev. (Asbury Health Center), 6.375%, 2024

     1,000,000      930,800

Colorado Health Facilities Authority Rev. (American Housing Foundation, Inc.), 8.5%, 2011 (c)

     530,000      595,492

Colorado Health Facilities Authority Rev. (Christian Living Communities Project), “A”, 5.75%, 2037

     500,000      422,115

Colorado Health Facilities Authority Rev. (Covenant Retirement Communities, Inc.), 5%, 2035

     1,100,000      934,945

Colorado Health Facilities Authority Rev. (Evangelical Lutheran), “A”, 6.125%, 2038

     120,000      120,319

Columbus, GA, Housing Authority Rev. (Calvary Community, Inc.), 7%, 2019

     400,000      355,984

Cumberland County, PA, Municipal Authority Rev. (Diakon Lutheran Social Ministries), 6.125%, 2029

     695,000      685,388

Fulton County, GA, Residential Care Facilities (Canterbury Court), “A”, 6.125%, 2026

     500,000      461,490

Fulton County, GA, Residential Care Facilities, Elderly Authority Rev. (Lenbrook Square Foundation, Inc.), “A”, 5%, 2029

     1,500,000      1,071,210

Hamden, CT, Facility Rev. (Whitney Center Project), “A”, 7.625%, 2030

     65,000      66,772

Hamden, CT, Facility Rev. (Whitney Center Project), “A”, 7.75%, 2043

     325,000      332,436

Hawaii Department of Budget & Finance, Special Purpose Rev. (15 Craigside Project), “A”, 9%, 2044

     140,000      153,252

 

4


MFS High Yield Municipal Trust

PORTFOLIO OF INVESTMENTS (Unaudited) 2/28/10 - continued

 

Issuer

   Shares/Par    Value ($)

Municipal Bonds – continued

     

Healthcare Revenue - Long Term Care – continued

     

Houston, TX, Health Facilities Development Corp. (Buckingham Senior Living Community), “A”, 7%, 2014 (c)

   $ 500,000    $ 609,795

Howard County, MD, Retirement Facilities Rev. (Vantage House Corp.), “A”, 5.25%, 2033

     200,000      157,346

Huntington, NY, Housing Authority Rev. (Gurwin Senior Jewish Residences), “A”, 5.875%, 2019

     420,000      378,395

Huntington, NY, Housing Authority Rev. (Gurwin Senior Jewish Residences), “A”, 6%, 2029

     650,000      517,667

Illinois Finance Authority Rev. (Smith Village), “A”, 6.25%, 2035

     1,000,000      802,940

Illinois Health Facilities Authority Rev. (Smith Crossing), “A”, 7%, 2032

     525,000      473,881

Indiana Health Facilities Financing Authority Rev. (Hoosier Care, Inc.), “A”, 7.125%, 2034

     1,000,000      827,920

Iowa Finance Authority, Health Care Facilities Rev. (Care Initiatives), 9.25%, 2011 (c)

     895,000      1,009,721

Iowa Finance Authority, Health Care Facilities Rev. (Care Initiatives), “B”, 5.75%, 2018

     505,000      460,262

Iowa Finance Authority, Health Care Facilities Rev. (Care Initiatives), “B”, 5.75%, 2028

     1,475,000      1,188,644

James City County, VA, Economic Development (WindsorMeade Project), “A”, 5.5%, 2037

     440,000      252,591

Kent County, DE, Assisted Living (Heritage at Dover LLC), 7.625%, 2030

     1,095,000      930,093

Kentucky Economic Development Finance Authority Health Facilities Rev. (AHF/Kentucky-IOWA, Inc.), 8%, 2029

     375,000      360,525

La Verne, CA, COP (Brethren Hillcrest Homes), “B”, 6.625%, 2025

     525,000      497,606

Lancaster, PA, Industrial Development Authority Rev. (Garden Spot Village), “A”, 7.625%, 2010 (c)

     325,000      332,101

Massachusetts Development Finance Agency Rev. (Adventcare), “A”, 6.75%, 2037

     695,000      590,674

Massachusetts Development Finance Agency Rev. (Alliance Health of Brockton, Inc.), “A”, 7.1%, 2032

     1,065,000      901,874

Massachusetts Development Finance Agency Rev. (Linden Ponds, Inc.), “A”, 5.5%, 2027

     185,000      138,053

Massachusetts Development Finance Agency Rev. (Linden Ponds, Inc.), “A”, 5.75%, 2035

     45,000      31,688

Massachusetts Development Finance Agency Rev. (Loomis Communities, Inc.), “A”, 5.625%, 2015

     220,000      214,100

Massachusetts Development Finance Agency Rev. (Loomis Communities, Inc.), “A”, 6.9%, 2032

     125,000      123,745

Massachusetts Development Finance Agency Rev. (The Groves in Lincoln), “A”, 7.75%, 2039

     80,000      81,944

Massachusetts Development Finance Agency Rev. (The Groves in Lincoln), “A”, 7.875%, 2044

     115,000      118,358

Massachusetts Industrial Finance Agency Rev. (GF/Massachusetts, Inc.), 8.3%, 2023

     755,000      419,312

Metropolitan Government of Nashville & Davidson County, TN, Health & Educational Facilities Board Rev. (Blakeford at Green Hills), 5.65%, 2024

     575,000      484,719

Montgomery County, PA, Industrial Development Authority Rev. (Whitemarsh Continuing Care), 6.125%, 2028

     150,000      119,840

Montgomery County, PA, Industrial Development Authority Rev. (Whitemarsh Continuing Care), 6.25%, 2035

     600,000      455,130

New Jersey Economic Development Authority Rev. (Lions Gate), “A”, 5.75%, 2025

     400,000      348,280

New Jersey Economic Development Authority Rev. (Lions Gate), “A”, 5.875%, 2037

     300,000      246,942

New Jersey Economic Development Authority Rev. (Seabrook Village, Inc.), 5.25%, 2026

     500,000      434,535

New Jersey Economic Development Authority Rev. (Seabrook Village, Inc.), 5.25%, 2036

     500,000      404,570

New Jersey Economic Development Authority Rev. (Seabrook Village, Inc.), “A”, 8.25%, 2010 (c)

     700,000      745,864

Norfolk, VA, Redevelopment & Housing Authority Rev. (Fort Norfolk Retirement Community), “A”, 6.125%, 2035

     195,000      169,880

Roseville, MN, Elder Care Facilities (Care Institute, Inc.), 7.75%, 2023

     1,630,000      1,295,312

 

5


MFS High Yield Municipal Trust

PORTFOLIO OF INVESTMENTS (Unaudited) 2/28/10 - continued

 

Issuer

   Shares/Par    Value ($)

Municipal Bonds – continued

     

Healthcare Revenue - Long Term Care – continued

     

Sartell, MN, Health Care & Housing Authority Rev. (The Foundation for Health Care), “A”, 6.625%, 2029

   $ 1,025,000    $ 984,441

Savannah, GA, Economic Development Authority, First Mortgage (Marshes of Skidway), “A”, 7.4%, 2034

     350,000      320,488

Shelby County, TN, Health, Educational & Housing Facilities Board Rev. (Germantown Village), “A”, 7.25%, 2034

     300,000      287,673

South Carolina Jobs & Economic Development Authority Rev. (Woodlands at Furman), “A”, 6%, 2027

     280,000      213,133

South Carolina Jobs & Economic Development Authority Rev. (Woodlands at Furman), “A”, 6%, 2042

     260,000      179,153

South Carolina Jobs & Economic Development Authority, Health Facilities Rev. (Wesley Commons), 5.3%, 2036

     200,000      153,534

St. John’s County, FL, Industrial Development Authority (Glenmoor Project), “A”, 5.25%, 2026

     500,000      392,815

Tarrant County, TX, Cultural Education Facilities Finance Corp. Retirement Facility (Air Force Village), 6.125%, 2029

     550,000      542,823

Tarrant County, TX, Cultural Education Facilities Finance Corp. Retirement Facility (Air Force Village), 6.375%, 2044

     415,000      401,741

Tarrant County, TX, Cultural Education Facilities Finance Corp. Retirement Facility (Stayton Museum Way), 8.25%, 2044

     770,000      748,455

Travis County, TX, Health Facilities Development Corp. Rev. (Westminster Manor Health), 7%, 2030

     130,000      129,983

Travis County, TX, Health Facilities Development Corp. Rev. (Westminster Manor Health), 7.125%, 2040

     195,000      195,045

Westmoreland County, PA, Industrial Development Authority Rev. (Redstone Retirement Community), “A”, 5.875%, 2032

     600,000      489,384

Westmoreland County, PA, Industrial Development Retirement Authority Rev. (Redstone Retirement Community), “A”, 5.75%, 2026

     1,250,000      1,066,638

Wisconsin Health & Educational Facilities Authority Rev. (All Saints Assisted Living Project), 6%, 2037

     180,000      129,316
         
      $ 32,976,461
         

Healthcare Revenue - Other – 0.6%

     

Massachusetts Health & Educational Facilities Authority Rev. (Civic Investments, Inc.), “A”, 9%, 2012 (c)

   $ 650,000    $ 765,395
         

Industrial Revenue - Airlines – 5.0%

     

Alliance Airport Authority, TX (American Airlines, Inc.), 5.25%, 2029

   $ 1,560,000    $ 986,903

Chicago, IL, O’Hare International Airport Special Facilities Rev. (American Airlines, Inc.), 5.5%, 2030

     1,025,000      709,300

Clayton County, GA, Development Authority Special Facilities Rev. (Delta Airlines, Inc.), “A”, 8.75%, 2029

     200,000      206,364

Clayton County, GA, Development Authority Special Facilities Rev. (Delta Airlines, Inc.), “B”, 9%, 2035

     150,000      151,953

Cleveland, OH, Airport Special Rev. (Continental Airlines, Inc.), 5.7%, 2019

     830,000      741,630

Dallas Fort Worth, TX, International Airport Facility Improvement Corp. (American Airlines, Inc.), 5.5%, 2030

     750,000      490,298

New Jersey Economic Development Authority, Special Facilities Rev. (Continental Airlines, Inc.), 9%, 2033

     1,250,000      1,312,925

New York, NY, City Industrial Development Agencies Rev. (American Airlines, Inc.), 7.5%, 2016

     370,000      368,150

New York, NY, City Industrial Development Agencies Rev. (American Airlines, Inc.), 7.625%, 2025

     155,000      153,258

New York, NY, City Industrial Development Agencies Rev. (American Airlines, Inc.), 7.75%, 2031

     385,000      383,764

New York, NY, City Industrial Development Agency Special Facility Rev. (American Airlines, Inc.), “B”, 8.5%, 2028

     500,000      511,880
         
      $ 6,016,425
         

 

6


MFS High Yield Municipal Trust

PORTFOLIO OF INVESTMENTS (Unaudited) 2/28/10 - continued

 

Issuer

   Shares/Par    Value ($)

Municipal Bonds – continued

     

Industrial Revenue - Chemicals – 0.9%

     

Brazos River, TX, Harbor Navigation District (Dow Chemical Co.), “B-2”, 4.95%, 2033

   $ 400,000    $ 383,464

Michigan Strategic Fund Ltd. Obligation Rev. (Dow Chemical Co.), 6.25%, 2014

     655,000      732,008
         
      $ 1,115,472
         

Industrial Revenue - Environmental Services – 1.9%

     

California Pollution Control Financing Authority, Solid Waste Disposal Rev. (Republic Services, Inc.), “B”, 5.25%, 2023 (b)

   $ 135,000    $ 138,179

California Pollution Control Financing Authority, Solid Waste Disposal Rev. (Waste Management, Inc.), “C”, 5.125%, 2023

     655,000      645,784

Carbon County, UT, Solid Waste Disposal Rev. (Laidlaw Environmental), “A”, 7.45%, 2017

     500,000      502,125

Gulf Coast Waste Disposal Authority, TX (Waste Management, Inc.), “A”, 5.2%, 2028

     360,000      359,975

New Hampshire Business Finance Authority, Solid Waste Disposal Rev. (Waste Management, Inc.), 5.2%, 2027

     660,000      652,575
         
      $ 2,298,638
         

Industrial Revenue - Other – 3.7%

     

Annawan, IL, Tax Increment Rev. (Patriot Renewable Fuels LLC), 5.625%, 2018

   $ 350,000    $ 275,076

California Statewide Communities, Development Authority Facilities (Microgy Holdings Project), 9%, 2038 (a)

     53,546      10,522

Gulf Coast, TX, Industrial Development Authority Rev. (CITGO Petroleum Corp.), 8%, 2028

     375,000      375,101

Houston, TX, Industrial Development Corp. (United Parcel Service, Inc.), 6%, 2023

     435,000      390,399

Indianapolis, IN, Airport Authority Rev., Special Facilities (FedEx Corp.), 5.1%, 2017

     500,000      514,845

Michigan Strategic Fund Rev. (Michigan Sugar Co.), “A”, 6.25%, 2015

     1,000,000      950,870

New Jersey Economic Development Authority Rev. (GMT Realty LLC), “B”, 6.875%, 2037

     1,000,000      814,040

Virgin Islands Government Refinery Facilities Rev. (Hovensa Coker Project), 6.5%, 2021

     250,000      255,000

Virgin Islands Public Finance Authority, Refinery Facilities Rev. (Hovensa Coker Project), 5.875%, 2022

     400,000      400,188

Will-Kankakee, IL, Regional Development Authority Rev. (Flanders Corp.), 6.5%, 2017

     555,000      514,929
         
      $ 4,500,970
         

Industrial Revenue - Paper – 3.0%

     

Beauregard Parish, LA (Boise Cascade Corp.), 6.8%, 2027

   $ 1,000,000    $ 814,320

Bedford County, VA, Industrial Development Authority Rev. (Nekooska Packaging Corp.), 5.6%, 2025

     400,000      364,432

Courtland, AL, Industrial Development Board Solid Waste Disposal Rev. (Champion International Corp.), 6%, 2029

     1,000,000      957,970

Escambia County, FL, Environmental Improvement Rev. (International Paper Co.), “A”, 5%, 2026

     980,000      851,855

Escambia County, FL, Environmental Improvement Rev. (International Paper Co.), “A”, 4.75%, 2030

     290,000      226,812

Phenix City, AL, Industrial Development Board Environmental Improvement Rev., “A” (MeadWestvaco Coated Board Project), 6.35%, 2035

     400,000      363,676
         
      $ 3,579,065
         

Miscellaneous Revenue - Entertainment & Tourism – 2.3%

     

Agua Caliente Band of Cahuilla Indians, CA, 5.6%, 2013 (n)

   $ 635,000    $ 638,194

Brooklyn, NY, Arena Local Development Corp. (Barclays Center Project), 6%, 2030

     135,000      139,479

Brooklyn, NY, Arena Local Development Corp. (Barclays Center Project), 6.25%, 2040

     85,000      87,604

Brooklyn, NY, Arena Local Development Corp. (Barclays Center Project), 6.375%, 2043

     65,000      66,862

Cabazon Band of Mission Indians, CA, 8.375%, 2015 (a)(z)

     130,000      86,600

Cabazon Band of Mission Indians, CA, 8.75%, 2019 (a)(z)

     720,000      474,019

Cow Creek Band of Umpqua Tribe of Indians, OR, “C”, 5.625%, 2026 (n)

     650,000      473,480

Mashantucket Western Pequot Tribe, CT, “B”, 0%, 2018 (n)

     1,100,000      364,100

 

7


MFS High Yield Municipal Trust

PORTFOLIO OF INVESTMENTS (Unaudited) 2/28/10 - continued

 

Issuer

   Shares/Par    Value ($)

Municipal Bonds – continued

     

Miscellaneous Revenue - Entertainment & Tourism – continued

     

New York Liberty Development Corp. Rev. (National Sports Museum), “A”, 6.125%, 2019 (d)

   $ 351,999    $ 1,056

New York, NY, City Industrial Development Agency Rev. (Queens Baseball Stadium), ASSD GTY, 6.125%, 2029

     30,000      33,218

New York, NY, City Industrial Development Agency Rev. (Queens Baseball Stadium), ASSD GTY, 6.375%, 2039

     25,000      27,315

New York, NY, City Industrial Development Agency Rev. (Queens Baseball Stadium), ASSD GTY, 6.5%, 2046

     100,000      110,142

Seminole Tribe, FL, Special Obligation Rev., “A”, 5.25%, 2027 (n)

     280,000      251,474
         
      $ 2,753,543
         

Miscellaneous Revenue - Other – 1.9%

     

Austin, TX, Convention Center (Convention Enterprises, Inc.), “A”, SYNCORA, 5.25%, 2024

   $ 305,000    $ 276,748

Capital Trust Agency, FL (Aero Syracuse LLC), 6.75%, 2032

     350,000      314,391

Dallas, TX, Civic Center Convention Complex Rev., ASSD GTY, 5.25%, 2034

     845,000      869,708

Summit County, OH, Port Authority Building Rev. (Twinsburg Township), “D”, 5.125%, 2025

     630,000      533,030

V Lakes Utility District Ranking Water Systems Rev., 7%, 2037

     300,000      259,479
         
      $ 2,253,356
         

Multi-Family Housing Revenue – 6.3%

     

Broward County, FL, Housing Finance Authority Rev. (Chaves Lakes Apartments Ltd.), “A”, 7.5%, 2040

   $ 500,000    $ 477,420

Capital Trust Agency, FL, Housing Rev. (Atlantic Housing Foundation), “B”, 7%, 2032

     625,000      262,506

Charter Mac Equity Issuer Trust, FHLMC, 6%, 2019 (n)

     1,000,000      1,030,150

Charter Mac Equity Issuer Trust, “B”, FHLMC, 7.6%, 2050 (b)(n)

     500,000      516,970

Clay County, FL, Housing Finance Authority Rev. (Madison Commons Apartments), “A”, 7.45%, 2040

     495,000      459,815

District of Columbia Housing Finance Agency (Henson Ridge), “E”, FHA, 5.1%, 2037

     655,000      631,603

Durham, NC, Durham Housing Authority Rev. (Magnolia Pointe Apartments), 5.65%, 2038 (b)

     929,155      729,312

El Paso County, TX, Housing Finance Corp. (American Housing Foundation), “D”, 10%, 2032

     285,000      265,500

El Paso County, TX, Housing Finance Corp. (American Housing Foundation), “C”, 8%, 2032

     280,000      257,818

Minneapolis, MN, Student Housing Rev. (Riverton Community Housing Project), “A”, 5.7%, 2040

     500,000      384,555

Mississippi Home Corp., Rev. (Kirkwood Apartments), 6.8%, 2037

     605,000      397,225

MuniMae TE Bond Subsidiary LLC, 5.8%, 2049 (z)

     1,000,000      655,000

New Mexico Mortgage Finance Authority, Multi-Family Housing Rev. (Sun Pointe Apartments), “E”, FHA, 4.8%, 2040

     500,000      464,235

Resolution Trust Corp., Pass-Through Certificates, “1993”, 8.5%, 2016 (z)

     455,481      429,277

Wilmington, DE, Multi-Family Housing Rev. (Electra Arms Senior Associates), 6.25%, 2028

     830,000      678,044
         
      $ 7,639,430
         

Sales & Excise Tax Revenue – 3.7%

     

Bolingbrook, IL, Sales Tax Rev., 6.25%, 2024

   $ 500,000    $ 273,115

Massachusetts School Building Authority, Dedicated Sales Tax Rev., AMBAC, 4.75%, 2032

     840,000      854,213

Metropolitan Pier & Exposition Authority, State Tax Rev., NATL, 0%, 2015

     3,000,000      2,461,500

Metropolitan Pier & Exposition Authority, State Tax Rev., ETM, FGIC, 0%, 2014 (c)

     1,010,000      935,775
         
      $ 4,524,603
         

Single Family Housing - Local – 1.3%

     

Minneapolis & St. Paul Housing Authority Rev. (City Living), “A-2”, GNMA, 5%, 2038

   $ 627,644    $ 604,446

Pittsburgh, PA, Urban Redevelopment Authority Rev., “C”, GNMA, 4.8%, 2028

     1,000,000      1,010,200
         
      $ 1,614,646
         

 

8


MFS High Yield Municipal Trust

PORTFOLIO OF INVESTMENTS (Unaudited) 2/28/10 - continued

 

Issuer

   Shares/Par    Value ($)

Municipal Bonds – continued

     

Single Family Housing - State – 2.9%

     

California Housing Finance Agency Rev., “G”, 5.5%, 2042

   $ 460,000    $ 463,984

Colorado Housing & Finance Authority, “A”, 5.5%, 2029

     1,315,000      1,382,499

Iowa Finance Authority, Single Family Mortgage Rev., “E”, 5.4%, 2032

     755,000      780,232

Kentucky Counties Single Family Mortgage Rev., “A”, NATL, 9%, 2016

     5,000      5,000

North Dakota Housing Finance Agency Rev., “A”, 4.85%, 2021

     310,000      311,386

Virginia Housing Development Authority, Commonwealth Mortgage, “A-5”, 4.4%, 2015

     210,000      214,849

Virginia Housing Development Authority, Commonwealth Mortgage, “A-5”, 4.4%, 2015

     340,000      348,418
         
      $ 3,506,368
         

Solid Waste Revenue – 0.1%

     

Pennsylvania Economic Development Financing Authority, Sewer Sludge Disposal Rev. (Philadelphia Biosolids Facility), 6.25%, 2032

   $ 75,000    $ 77,042
         

State & Agency - Other – 0.5%

     

Commonwealth of Puerto Rico (Mepsi Campus), “A”, 6.25%, 2024

   $ 100,000    $ 96,116

Commonwealth of Puerto Rico (Mepsi Campus), “A”, 6.5%, 2037

     500,000      456,045
         
      $ 552,161
         

State & Local Agencies – 4.4%

     

Dorchester County, SC, School District No. 2, Growth Remedy Opportunity Tax Hike, 5.25%, 2029

   $ 500,000    $ 517,550

Laurens County, SC, School District No. 55, Installment Purchase Rev., 5.25%, 2030

     700,000      649,278

Michigan Building Authority Rev., Facilities Program, “I”, 5%, 2024 (c)

     45,000      48,173

Michigan Building Authority Rev., Facilities Program, “I”, 5%, 2024

     955,000      979,257

New York Metropolitan Transportation Authority, “A”, 5.125%, 2029

     800,000      813,888

Newberry, SC, Investing in Children’s Education (Newberry County School District Program), 5%, 2030

     400,000      370,224

Philadelphia, PA, Municipal Authority Rev., 6.5%, 2034

     135,000      141,395

Puerto Rico Public Finance Corp., “E”, 6%, 2026

     820,000      1,037,595

Puerto Rico Public Finance Corp., “E”, ETM, 6%, 2026 (c)

     80,000      100,109

Wisconsin General Fund Annual Appropriation Rev., “A”, 5.75%, 2033

     660,000      716,173
         
      $ 5,373,642
         

Student Loan Revenue – 0.5%

     

Massachusetts Educational Financing Authority, Education Loan Rev., “A”, 5.5%, 2022

   $ 25,000    $ 26,599

Massachusetts Educational Financing Authority, Education Loan Rev., “H”, ASSD GTY, 6.35%, 2030

     505,000      536,027
         
      $ 562,626
         

Tax - Other – 1.2%

     

Dallas County, TX, Flood Control District, 7.25%, 2032

   $ 750,000    $ 782,348

New York, NY, City Transitional Finance Authority Building Aid Rev., “S-3”, 5.25%, 2039

     440,000      457,032

Virgin Islands Public Finance Authority Rev. (Diageo Project), “A”, 6.75%, 2037

     205,000      219,145
         
      $ 1,458,525
         

Tax Assessment – 9.2%

     

Atlanta, GA, Tax Allocation (Eastside Project), “B”, 5.4%, 2020

   $ 500,000    $ 481,150

Ave Maria Stewardship Community District, FL, “A”, 5.125%, 2038

     150,000      107,114

Capital Region Community Development District, FL, Capital Improvement Rev., “A”, 7%, 2039

     235,000      219,558

Celebration Community Development District, FL, “A”, 6.4%, 2034

     700,000      702,702

Channing Park Community Development District, FL, 5.3%, 2038

     400,000      251,800

Chicago, IL, Tax Increment Allocation (Pilsen Redevelopment), “B”, 6.75%, 2022

     310,000      294,147

Du Page County, IL, Special Service Area No. 31 Special Tax (Monarch Landing Project), 5.625%, 2036

     250,000      186,088

Durbin Crossing Community Development District, FL, Special Assessment, “B-1”, 4.875%, 2010

     125,000      103,274

Grand Bay at Doral Community Development District, FL, “A”, 6%, 2039

     90,000      48,530

Grand Bay at Doral Community Development District, FL, “B”, 6%, 2017

     545,000      374,933

 

9


MFS High Yield Municipal Trust

PORTFOLIO OF INVESTMENTS (Unaudited) 2/28/10 - continued

 

Issuer

   Shares/Par    Value ($)

Municipal Bonds – continued

     

Tax Assessment – continued

     

Heritage Harbour North Community Development District, FL, Capital Improvement Rev., 6.375%, 2038

   $ 315,000    $ 251,568

Homestead, FL, Community Development District, Special Assessment, “A”, 6%, 2037 (d)

     370,000      220,779

Homestead, FL, Community Development District, Special Assessment, “B”, 5.9%, 2013 (d)

     170,000      103,114

Huntington Beach, CA, Community Facilities District, Special Tax (Grand Coast Resort), “2000-1”, 6.45%, 2031

     500,000      490,325

Lincolnshire, IL, Special Service Area No. 1 (Sedgebrook Project), 6.25%, 2034

     250,000      186,730

Magnolia Park Community Development District, FL, Special Assessment, “A”, 6.15%, 2039

     615,000      404,455

Main Street Community Development District, FL, “A”, 6.8%, 2038

     290,000      238,044

Main Street Community Development District, FL, “B”, 6.9%, 2017

     225,000      210,049

Northwest Metropolitan District No. 3, CO, 6.25%, 2035

     500,000      350,630

Oakmont Grove Community Development District, CA, “A”, 5.4%, 2038 (d)

     300,000      120,666

Ohio County, WV, Commission Tax Increment Rev. (Fort Henry Centre), “A”, 5.85%, 2034

     125,000      114,144

Orlando, FL, Special Assessment Rev. (Conroy Road Interchange Project), “A”, 5.5%, 2010

     25,000      25,005

Orlando, FL, Special Assessment Rev. (Conroy Road Interchange Project), “A”, 5.8%, 2026

     300,000      285,189

Plano, IL, Special Service Area No. 4 (Lakewood Springs Project Unit 5-B), 6%, 2035

     1,477,000      1,222,764

Portage, IN, Economic Development Rev. (Ameriplex Project), 5%, 2027

     260,000      230,867

San Diego, CA, Redevelopment Agency, Tax Allocation, AGM, 0%, 2018

     1,015,000      697,234

Sarasota National Community Development District, FL, Special Assessment Rev., 5.3%, 2039 (d)

     800,000      392,536

Sweetwater Creek Community Development District, FL, Capital Improvement Rev., 5.5%, 2038

     195,000      113,831

Tolomato Community Development District, FL, Special Assessment, 6.65%, 2040

     585,000      492,588

Tuscany Reserve Community Development District, FL, Special Assessment, “B”, 5.25%, 2016

     185,000      120,211

Volo Village, IL, Special Service Area No. 3, Special Tax (Symphony Meadows Project), “1”, 6%, 2036

     484,000      309,731

West Villages Improvement District, FL, Special Assessment Rev. (Unit of Development No. 3), 5.5%, 2037

     490,000      222,646

Westchester, FL, Community Development District No. 1 (Community Infrastructure), 6.125%, 2035

     275,000      197,117

Westridge, FL, Community Development District, Capital Improvement Rev., 5.8%, 2037 (d)

     960,000      393,581

Wyandotte County-Kansas City, KS, Unified Government Transportation Development District (Legends Village West Project), 4.875%, 2028

     580,000      410,965

Yorba Linda, CA, Redevelopment Agency, Tax Allocation Rev., “A”, NATL, 0%, 2024

     1,325,000      566,411
         
      $ 11,140,476
         

Tobacco – 8.6%

     

Buckeye, OH, Tobacco Settlement Financing Authority, “A-2”, 5.875%, 2030

   $ 1,610,000    $ 1,364,620

Buckeye, OH, Tobacco Settlement Financing Authority, “A-2”, 5.875%, 2047

     2,810,000      2,103,397

Buckeye, OH, Tobacco Settlement Financing Authority, “A-2”, 6.5%, 2047

     785,000      643,276

Golden State, CA, Tobacco Securitization Corp., Tobacco Settlement Rev., “A-1”, 6.25%, 2013 (c)

     1,350,000      1,505,291

Golden State, CA, Tobacco Securitization Corp., Tobacco Settlement Rev., Asset Backed, “A-1”, 5%, 2033

     440,000      344,678

Inland Empire, CA, Tobacco Securitization Corp., Tobacco Settlement Rev., Asset Backed, “C-1”, 0%, 2036

     1,815,000      167,379

Michigan Tobacco Settlement Finance Authority Rev., Asset Backed, “A”, 6%, 2048

     1,710,000      1,346,403

Rhode Island Tobacco Settlement Authority, 6%, 2023

     1,825,000      1,849,601

Virginia Tobacco Settlement Financing Corp., “B-1”, 5%, 2047

     830,000      583,357

 

10


MFS High Yield Municipal Trust

PORTFOLIO OF INVESTMENTS (Unaudited) 2/28/10 - continued

 

Issuer

   Shares/Par    Value ($)

Municipal Bonds – continued

     

Tobacco – continued

     

Washington Tobacco Settlement Authority Rev., 6.625%, 2032

   $ 500,000    $ 503,040
         
      $ 10,411,042
         

Toll Roads – 4.5%

     

E-470 Public Highway Authority, CO, “B”, 0%, 2010 (c)

   $ 8,750,000    $ 1,329,300

E-470 Public Highway Authority, CO, “B”, NATL, 0%, 2018

     1,500,000      913,080

Pennsylvania Turnpike Commission, Capital Appreciation, “C”, AGM, 0%, 2033

     1,440,000      1,050,149

San Joaquin Hills, CA, Transportation Corridor Agency Toll Road Rev., “A”, NATL, 0%, 2015

     3,000,000      2,173,800
         
      $ 5,466,329
         

Universities - Colleges – 8.3%

     

Brevard County, FL, Industrial Development Rev. (TUFF Florida Tech LLC Project), 6.75%, 2039

   $ 540,000    $ 539,935

California Educational Facilities Authority Rev. (University of Southern California), “A”, 5.25%, 2038

     1,270,000      1,351,991

California Municipal Finance Authority Rev. (Biola University), 5.8%, 2028

     100,000      102,061

Florida State University Board of Governors, System Improvement Rev., 6.25%, 2030

     1,000,000      1,137,710

Grand Valley, MI, State University Rev., 5.5%, 2027

     135,000      143,737

Grand Valley, MI, State University Rev., 5.625%, 2029

     65,000      69,169

Harris County, TX, Cultural Education Facilities Rev. (Baylor College of Medicine), “D”, 5.625%, 2032

     540,000      502,389

Illinois Finance Authority Rev. (Roosevelt University Project), 6.25%, 2029

     670,000      688,907

Illinois Finance Authority Rev. (Roosevelt University Project), 6.5%, 2039

     155,000      160,461

Massachusetts Health & Educational Facilities Authority Rev. (Simmons College), “I”, 8%, 2029

     255,000      285,248

Massachusetts Health & Educational Facilities Authority Rev. (Suffolk University), “A”, 6.25%, 2030

     725,000      775,112

Savannah, GA, Economic Development Authority Rev. (AASU Student Union LLC), ASSD GTY, 5.125%, 2039

     1,320,000      1,355,297

University of Illinois Rev. (Auxiliary Facilities Systems), “A”, 5.125%, 2029

     1,880,000      1,976,726

University of Southern Indiana Rev., Student Fee, “J”, ASSD GTY, 5.75%, 2028

     300,000      331,860

University of Southern Mississippi Educational Building Corp. Rev. (Campus Facilities Project), 5.25%, 2032

     220,000      235,442

University of Southern Mississippi, Educational Building Corp. Rev. (Campus Facilities Project), 5.375%, 2036

     80,000      85,743

Washington Higher Education Facilities Authority Rev. (Whitworth University), 5.875%, 2034

     280,000      285,426
         
      $ 10,027,214
         

Universities - Dormitories – 0.5%

     

California Statewide Communities Development Authority Rev. (Lancer Educational Student Housing Project), 5.625%, 2033

   $ 735,000    $ 576,306
         

Universities - Secondary Schools – 1.4%

     

California Statewide Communities Development Authority Rev., COP (Crossroads Schools for the Arts & Sciences), 6%, 2028

   $ 980,000    $ 950,237

Colorado Housing Finance Development Rev. (Evergreen Country Day School), 5.875%, 2037

     175,000      120,775

La Vernia, TX, Higher Education Finance Corp. Rev. (KIPP, Inc.), “A”, 6.25%, 2039

     195,000      200,025

Lee County, FL, Industrial Development Authority Rev. (Lee Charter Foundation), “A”, 5.375%, 2037

     535,000      390,630

Philadelphia, PA, Authority for Industrial Development Rev. (Mast Charter School), 6%, 2035

     50,000      49,803
         
      $ 1,711,470
         

Utilities - Cogeneration – 0.7%

     

Puerto Rico Industrial, Tourist, Educational, Medical & Environmental Central Facilities (Cogeneration Facilities - AES Puerto Rico Project), 6.625%, 2026

   $ 320,000    $ 323,034

 

11


MFS High Yield Municipal Trust

PORTFOLIO OF INVESTMENTS (Unaudited) 2/28/10 - continued

 

Issuer

   Shares/Par    Value ($)

Municipal Bonds – continued

     

Utilities - Cogeneration – continued

     

Suffolk County, NY, Industrial Development Agency Rev. (Nissequoque Cogeneration Partners Facilities), 5.5%, 2023

   $ 550,000    $ 480,843
         
      $ 803,877
         

Utilities - Investor Owned – 6.4%

     

Brazos River Authority, TX, Pollution Control Rev. (TXU Electric Co. LLC), “C”, 5.75%, 2036 (b)

   $ 150,000    $ 142,706

Brazos River Authority, TX, Pollution Control Rev. (TXU Electric Co. LLC), “C”, 6.75%, 2038

     555,000      317,033

Brazos River Authority, TX, Pollution Control Rev. (TXU Electric Co. LLC), “D”, 5.4%, 2029 (b)

     45,000      37,005

Bryant, IL, Pollution Control Rev. (Central Illinois Light Co.), 5.9%, 2023

     975,000      977,681

Chula Vista, CA, Industrial Development Rev. (San Diego Gas), 5.875%, 2034

     245,000      268,868

Maricopa County, AZ, Pollution Control Corp., Pollution Control Rev. (Arizona Public Service Co.), “D”, 6%, 2029 (b)

     475,000      507,861

Massachusetts Development Finance Agency, Solid Waste Disposal Rev. (Dominion Energy Brayton), 5.75%, 2042 (b)

     85,000      90,275

Matagorda County, TX, Pollution Control Rev. (Central Power & Light Co.), “A”, 6.3%, 2029

     275,000      297,440

Mississippi Business Finance Corp., Pollution Control Rev. (Systems Energy Resources Project), 5.875%, 2022

     1,500,000      1,490,070

New Hampshire Business Finance Authority, Pollution Control Rev. (Public Service of New Hampshire), “B”, NATL, 4.75%, 2021

     250,000      245,105

Owen County, KY, Waterworks System Rev. (American Water Co. Project), “A”, 6.25%, 2039

     205,000      219,223

Pennsylvania Economic Development Financing Authority (Allegheny Energy Supply Co. LLC), 7%, 2039

     600,000      670,266

Pima County, AZ, Industrial Development Authority Rev. (Tucson Electric Power Co.), 5.75%, 2029

     1,015,000      1,016,238

Red River Authority, TX, Pollution Control Rev. (AEP Texas Central Co.), NATL, 4.45%, 2020

     410,000      395,572

Sabine River Authority, TX, Pollution Control Rev. (TXU Electric Co. LLC), 5.2%, 2028

     185,000      97,878

Sabine River Authority, TX, Pollution Control Rev. (TXU Electric Co. LLC), 5.75%, 2030 (b)

     155,000      147,478

Sweetwater County, WY, Pollution Control Rev. (Idaho Power Co.), 5.25%, 2026

     540,000      552,442

West Feliciana Parish, LA, Pollution Control Rev. (Entergy Gulf States), 6.6%, 2028

     270,000      270,165
         
      $ 7,743,306
         

Utilities - Municipal Owned – 0.1%

     

Harris County, TX, Cultural Education Facilities Financial Corp., Thermal Utilities Rev. (Teco Project), “A”, 5.25%, 2035

   $ 140,000    $ 147,046
         

Utilities - Other – 3.7%

     

California M-S-R Energy Authority Gas Rev., “A”, 7%, 2034

   $ 155,000    $ 173,510

California M-S-R Energy Authority Gas Rev., “A”, 6.5%, 2039

     335,000      352,758

Indiana Bond Bank Special Program, Gas Rev., “A”, 5.25%, 2018

     230,000      239,032

Main Street Natural Gas, Inc., GA, Gas Project Rev., “A”, 5.5%, 2028

     335,000      324,407

Main Street Natural Gas, Inc., GA, Gas Project Rev., “B”, 5%, 2019

     325,000      331,624

Public Authority for Colorado Energy Natural Gas Purchase Rev., 6.5%, 2038

     25,000      27,505

Salt Verde Financial Corp., AZ, Senior Gas Rev., 5%, 2037

     705,000      599,800

Tennessee Energy Acquisition Corp., Gas Rev., “A”, 5.25%, 2021

     1,710,000      1,717,319

Tennessee Energy Acquisition Corp., Gas Rev., “A”, 5.25%, 2022

     270,000      269,754

Tennessee Energy Acquisition Corp., Gas Rev., “A”, 5.25%, 2026

     165,000      160,565

Tennessee Energy Acquisition Corp., Gas Rev., “C”, 5%, 2025

     240,000      233,112
         
      $ 4,429,386
         

Water & Sewer Utility Revenue – 3.1%

     

Atlanta, GA, Water & Wastewater Rev., “A”, 6%, 2022

   $ 370,000    $ 403,378

Birmingham, AL, Waterworks Board Water Rev., “A”, ASSD GTY,, 5.125%, 2034

     595,000      618,294

 

12


MFS High Yield Municipal Trust

PORTFOLIO OF INVESTMENTS (Unaudited) 2/28/10 - continued

 

Issuer

   Shares/Par    Value ($)  

Municipal Bonds – continued

     

Water & Sewer Utility Revenue – continued

     

Commonwealth of Puerto Rico Aqueduct & Sewer Authority Rev., “A”, 6%, 2038

   $ 655,000    $ 671,310   

Commonwealth of Puerto Rico Aqueduct & Sewer Authority Rev., “A”, 6%, 2044

     135,000      138,272   

Detroit, MI, Sewer Disposal System Rev., “B”, AGM, 7.5%, 2033

     515,000      613,391   

New York, NY, Municipal Water Finance Authority, Water & Sewer Systems Rev. “DD”, 4.75%, 2035

     790,000      795,269   

Surprise, AZ, Municipal Property Corp., 4.9%, 2032

     700,000      552,503   
           
      $ 3,792,417   
           

Total Municipal Bonds

      $ 192,307,005   
           

Other Assets, Less Liabilities – 3.1%

        3,777,796   

Preferred Shares (Issued by the Fund) – (61.9)%

        (75,000,000
           

Net assets applicable to common shares – 100.0%

      $ 121,084,801   
           

 

(a) Non-income producing security.
(b) Mandatory tender date is earlier than stated maturity date.
(c) Refunded bond.
(d) Non-income producing security – in default.
(f) All or a portion of the security has been segregated as collateral for open futures contracts.
(n) Securities exempt from registration under Rule 144A of the Securities Act of 1933. These securities may be sold in the ordinary course of business in transactions exempt from registration, normally to qualified institutional buyers. At period end, the aggregate value of these securities was $3,274,368 representing 2.7% of net assets applicable to common shares.
(z) Restricted securities are not registered under the Securities Act of 1933 and are subject to legal restrictions on resale. These securities generally may be resold in transactions exempt from registration or to the public if the securities are subsequently registered. Disposal of these securities may involve time-consuming negotiations and prompt sale at an acceptable price may be difficult. The fund holds the following restricted securities:

 

Restricted Securities

   Acquisition Date    Cost    Current
Market Value
 

Cabazon Band of Mission Indians, CA, 8.375%, 2015

   10/04/04    $ 130,000    $ 86,600   

Cabazon Band of Mission Indians, CA, 8.75%, 2019

   10/04/04      720,000      474,019   

MuniMae TE Bond Subsidiary LLC, 5.8%, 2049

   10/04/04      1,000,000      655,000   

Resolution Trust Corp., Pass-Through Certificates, “1993”, 8.5%, 2016

   10/17/01-1/14/02      455,481      429,277   
              

Total Restricted Securities

         $ 1,644,896   

% of Net Assets Applicable to Common Shares

           1.4

The following abbreviations are used in this report and are defined:

 

COP    Certificate of Participation
ETM    Escrowed to Maturity
LOC    Letter of Credit

Insurers

    
AGM    Assured Guaranty Municipal
AMBAC    AMBAC Indemnity Corp.
ASSD GTY    Assured Guaranty Insurance Co.
FGIC    Financial Guaranty Insurance Co.
FHA    Federal Housing Administration
FHLMC    Federal Home Loan Mortgage Corp.
GNMA    Government National Mortgage Assn.
NATL    National Public Finance Guarantee Corp.
PSF    Permanent School Fund
SYNCORA    Syncora Guarantee Inc.

See attached supplemental information. For more information see notes to financial statements as disclosed in the most recent semiannual or annual report.

 

13


MFS High Yield Municipal Trust

Supplemental Information (Unaudited) 2/28/10

(1) Investment Valuations

Debt instruments and floating rate loans (other than short-term instruments), including restricted debt instruments, are generally valued at an evaluated or composite bid as provided by a third-party pricing service. Short-term instruments with a maturity at issuance of 60 days or less generally are valued at amortized cost, which approximates market value. Futures contracts are generally valued at last posted settlement price as provided by a third-party pricing service on the market on which they are primarily traded. Futures contracts for which there were no trades that day for a particular position are generally valued at the closing bid quotation as provided by a third-party pricing service on the market on which such futures contracts are primarily traded. Securities and other assets generally valued on the basis of information from a third-party pricing service may also be valued at a broker/dealer bid quotation. Values obtained from third-party pricing services can utilize both transaction data and market information such as yield, quality, coupon rate, maturity, type of issue, trading characteristics, and other market data.

The Board of Trustees has delegated primary responsibility for determining or causing to be determined the value of the fund’s investments (including any fair valuation) to the adviser pursuant to valuation policies and procedures approved by the Board. If the adviser determines that reliable market quotations are not readily available, investments are valued at fair value as determined in good faith by the adviser in accordance with such procedures under the oversight of the Board of Trustees. Under the fund’s valuation policies and procedures, market quotations are not considered to be readily available for most types of debt instruments and floating rate loans and many types of derivatives. These investments are generally valued at fair value based on information from third-party pricing services. In addition, investments may be valued at fair value if the adviser determines that an investment’s value has been materially affected by events occurring after the close of the exchange or market on which the investment is principally traded (such as foreign exchange or market) and prior to the determination of the fund’s net asset value, or after the halting of trading of a specific security where trading does not resume prior to the close of the exchange or market on which the security is principally traded. The adviser generally relies on third-party pricing services or other information (such as the correlation with price movements of similar securities in the same or other markets; the type, cost and investment characteristics of the security; the business and financial condition of the issuer; and trading and other market data) to assist in determining whether to fair value and at what value to fair value an investment. The value of an investment for purposes of calculating the fund’s net asset value can differ depending on the source and method used to determine value. When fair valuation is used, the value of an investment used to determine the fund’s net asset value may differ from quoted or published prices for the same investment. There can be no assurance that the fund could obtain the fair value assigned to an investment if it were to sell the investment at the same time at which the fund determines its net asset value per share.

Various inputs are used in determining the value of the fund’s assets or liabilities. These inputs are categorized into three broad levels. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, an investment’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. The fund’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the investment. Level 1 includes unadjusted quoted prices in active markets for identical assets or liabilities. Level 2 includes other significant observable market-based inputs (including quoted prices for similar securities, interest rates, prepayment speed, and credit risk). Level 3 includes unobservable inputs, which may include the adviser’s own assumptions in determining the fair value of investments. Other financial instruments are derivative instruments not reflected in total investments, such as futures, forwards, swap contracts, and written options. The following is a summary of the levels used as of February 28, 2010 in valuing the fund’s assets or liabilities:

 

Investments at Value

   Level 1     Level 2    Level 3    Total  

Municipal Bonds

   $ —        $ 192,307,005    $ —      $ 192,307,005   

Other Financial Instruments

                      

Futures

   $ (242,977   $ —      $ —      $ (242,977

For further information regarding security characteristics, see the Portfolio of Investments.

In January 2010, Accounting Standards Update (ASU) No. 2010-06, Improving Disclosures about Fair Value Measurements (the “Update”) was issued, and is effective for interim and annual reporting periods beginning after December 15, 2009. This Update provides for expanded disclosures about fair value measurements. Management has evaluated the application of the Update to the fund, and believes the impact is limited to expanded disclosures resulting from the adoption of this Update in the fund’s financial statements.

(2) Portfolio Securities

The cost and unrealized appreciation and depreciation in the value of the investments owned by the fund, as computed on a federal income tax basis, are as follows:

 

Aggregate cost

   $ 199,808,430   
        

Gross unrealized appreciation

   $ 9,022,093   

Gross unrealized depreciation

     (16,523,518
        

Net unrealized appreciation (depreciation)

   $ (7,501,425
        

The aggregate cost above includes prior fiscal year end tax adjustments.

 

14


MFS High Yield Municipal Trust

Supplemental Information (Unaudited) 2/28/10 - continued

(3) Derivative Contracts at 2/28/10

Futures Contracts Outstanding at 2/28/10

 

Description

   Currency    Contracts    Value    Expiration
Date
   Unrealized
Appreciation
(Depreciation)
 

Liability Derivatives

              

Interest Rate Futures

              

U.S. Treasury Note 10 yr (Short)

   USD    238    $ 27,961,281    Jun-10    $ (196,615

U.S. Treasury Note 30 yr (Short)

   USD    32      3,766,000    Jun-10      (46,362
                    
               $ (242,977
                    

At February 28, 2010, the fund had sufficient cash and/or other liquid securities to cover any commitments under these derivative contracts.

 

15


ITEM 2. CONTROLS AND PROCEDURES.

 

(a) Based upon their evaluation of the effectiveness of the registrant’s disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940 (the “Act”)) as conducted within 90 days of the filing date of this Form N-Q, the registrant’s principal financial officer and principal executive officer have concluded that those disclosure controls and procedures provide reasonable assurance that the material information required to be disclosed by the registrant on this report is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms.

 

(b) There were no changes in the registrant’s internal controls over financial reporting (as defined in Rule 30a-3(d) under the Act) that occurred during the registrant’s last fiscal quarter that have materially affected, or are reasonably likely to materially affect, the registrant’s internal control over financial reporting.

 

ITEM 3. EXHIBITS.

File as exhibits as part of this Form a separate certification for each principal executive officer and principal financial officer of the registrant as required by Rule 30a-2(a) under the Act (17 CFR 270.30a-2): Attached hereto.


Notice

A copy of the Agreement and Declaration of Trust, as amended, of the Registrant is on file with the Secretary of State of The Commonwealth of Massachusetts and notice is hereby given that this instrument is executed on behalf of the Registrant by an officer of the Registrant as an officer and not individually and the obligations of or arising out of this instrument are not binding upon any of the Trustees or shareholders individually, but are binding only upon the assets and property of the respective constituent series of the Registrant.


SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Registrant: MFS HIGH YIELD MUNICIPAL TRUST

 

By (Signature and Title)*    MARIA F. DWYER
  Maria F. Dwyer, President

Date: April 16, 2010

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

 

By (Signature and Title)*    MARIA F. DWYER
  Maria F. Dwyer, President (Principal Executive Officer)

Date: April 16, 2010

 

By (Signature and Title)*    JOHN M. CORCORAN
 

John M. Corcoran, Treasurer (Principal Financial Officer

and Accounting Officer)

Date: April 16, 2010

 

* Print name and title of each signing officer under his or her signature.