MFS Municipal Income R6 (MPMNX) NPORT-P MFS West Virginia Municipal Bond Fund (Jun 2024 report)

Quarterly Report

June 30, 2024

MFS^®West Virginia
Municipal Bond Fund

MWV-Q1

Portfolio of Investments

6/30/24 (unaudited)

The Portfolio of Investments is a complete list of all securities owned by your fund. It is categorized by broad-based asset classes.

Issuer		Shares/Par	Value ($)
Municipal Bonds – 97.3%
Airport Revenue – 0.8%
New York Transportation Development Corp., Special Facilities Rev. (John F. Kennedy International Airport New Terminal One Project), AGM, 5.25%, 6/30/2060	$	445,000	$465,908
Wayne County, MI, Airport Authority Rev. (Detroit Metropolitan Wayne County Airport), “B”, 5%, 12/01/2044		60,000	60,096
Wayne County, MI, Airport Authority Rev. (Detroit Metropolitan Wayne County Airport), “B”, BAM, 5%, 12/01/2039		70,000	70,216
Wayne County, MI, Airport Authority Rev. (Detroit Metropolitan Wayne County Airport), “C”, 5%, 12/01/2039		55,000	55,088
Wayne County, MI, Airport Authority Rev. (Detroit Metropolitan Wayne County Airport), “C”, 5%, 12/01/2044		85,000	85,055
			$736,363
General Obligations - General Purpose – 6.2%
Bridgeview, IL, Stadium and Redevelopment Projects, Taxable, AAC, 5.14%, 12/01/2036	$	260,000	$233,166
Chicago, IL, General Obligation, “A”, 5.5%, 1/01/2040		360,000	389,468
Commonwealth of Puerto Rico, General Obligation Restructured Bonds, “A”, 5.625%, 7/01/2029		44,227	47,434
Commonwealth of Puerto Rico, General Obligation Restructured Bonds, “A”, 5.75%, 7/01/2031		42,958	47,702
Commonwealth of Puerto Rico, General Obligation Restructured Bonds, “A”, 4%, 7/01/2033		40,735	40,796
Commonwealth of Puerto Rico, General Obligation Restructured Bonds, “A”, 4%, 7/01/2035		74,630	73,262
Commonwealth of Puerto Rico, General Obligation Restructured Bonds, “A”, 4%, 7/01/2037		31,426	30,252
Commonwealth of Puerto Rico, General Obligation Restructured Bonds, “A”, 4%, 7/01/2041		42,727	39,822
Commonwealth of Puerto Rico, General Obligation Restructured Bonds, “A”, 4%, 7/01/2046		143,435	129,760
Commonwealth of Puerto Rico, General Obligation Restructured Bonds, Capital Appreciation, “A”, 0%, 7/01/2024		6,627	6,627
Commonwealth of Puerto Rico, General Obligation Restructured Bonds, Capital Appreciation, “A”, 0%, 7/01/2033		52,422	34,979
State of Illinois, General Obligation, 5.5%, 5/01/2039		165,000	180,621
State of Illinois, General Obligation, “C”, 4%, 10/01/2040		155,000	149,624
State of Illinois, General Obligation, “C”, 4%, 10/01/2041		70,000	66,903
State of West Virginia, General Obligation Road Bonds, “A”, 5%, 6/01/2043		400,000	433,696
State of West Virginia, General Obligation Road Bonds, “A”, 5%, 12/01/2043		1,000,000	1,051,437
State of West Virginia, General Obligation Road Bonds, “A”, 5%, 6/01/2044		2,000,000	2,102,154
State of West Virginia, General Obligation Road Bonds, “A”, 5%, 12/01/2044		705,000	763,279
			$5,820,982
General Obligations - Schools – 5.0%
Berkeley County, WV, Public School Board of Education, 3%, 6/01/2026	$	750,000	$740,875
Berkeley County, WV, Public School Board of Education, 4%, 6/01/2037		1,000,000	1,027,187
Cabell County, WV, Public School Board of Education, AGM, 3%, 6/01/2029		1,000,000	976,110
Little Rock, AR, School District & Construction, “A”, BAM, 3%, 2/01/2048		820,000	646,261
Orange County, CA, Anaheim Elementary School District, AGM, 4%, 8/01/2048		310,000	304,243
Wood County, WV, Public School Board of Education, 4%, 6/01/2039		1,000,000	1,005,450
			$4,700,126
Healthcare Revenue - Hospitals – 13.8%
Allegheny County, PA, Hospital Development Authority Rev. (Allegheny Health Network Obligated Group), “A”, 4%, 4/01/2044	$	155,000	$146,159
Doylestown, PA, Hospital Authority Rev., “A”, 4%, 7/01/2045 (Prerefunded 7/01/2029)		5,000	5,165
Doylestown, PA, Hospital Authority Rev., “A”, 4%, 7/01/2045		10,000	8,466
Virginia Small Business Financing Authority, Health Facilities Rev. (Bon Secours Mercy Health, Inc.), “A”, 4%, 12/01/2049		490,000	468,005
West Virginia Hospital Finance Authority Hospital Rev. (Cabell Huntington Hospital Obligated Group), 4%, 1/01/2038		230,000	206,470
West Virginia Hospital Finance Authority Hospital Rev. (Cabell Huntington Hospital Obligated Group), “A”, 4.125%, 1/01/2047		1,245,000	1,029,559
West Virginia Hospital Finance Authority Hospital Rev. (Charleston Area Medical Center, Inc.), “A”, 5%, 9/01/2028		1,000,000	1,001,376
West Virginia Hospital Finance Authority Hospital Rev. (Charleston Area Medical Center, Inc.), “A”, 5%, 9/01/2039		1,500,000	1,524,478
West Virginia Hospital Finance Authority Hospital Rev. (Valley Health System Obligation Group), 5%, 1/01/2044		1,000,000	1,006,351
West Virginia Hospital Finance Authority Hospital Rev. (Vandalia Health Group), “B”, 5.5%, 9/01/2048		1,000,000	1,101,308
West Virginia Hospital Finance Authority Hospital Rev. (West Virginia United Health System Obligated Group), “A”, 5%, 6/01/2027		200,000	205,514
West Virginia Hospital Finance Authority Hospital Rev. (West Virginia United Health System Obligated Group), “A”, 4%, 6/01/2035		1,500,000	1,490,520
West Virginia Hospital Finance Authority Hospital Rev. (West Virginia University Health System Obligated Group), “A”, 5%, 6/01/2042		1,000,000	1,019,001

1

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
Healthcare Revenue - Hospitals – continued
West Virginia Hospital Finance Authority Hospital Rev. (West Virginia University Health System Obligated Group), “A”, 4%, 6/01/2051	$	860,000	$787,987
West Virginia Hospital Finance Authority Hospital Rev. (West Virginia University Health System Obligated Group), “A”, 4.375%, 6/01/2053		1,000,000	981,974
West Virginia Hospital Finance Authority Hospital Rev. (West Virginia University Health System Obligated Group), “A”, AGM, 4%, 6/01/2051		2,220,000	2,073,105
			$13,055,438
Industrial Revenue - Environmental Services – 1.8%
Pennsylvania Economic Development Financing Authority, Solid Waste Disposal Rev. (Waste Management, Inc. Project), 2.15%, 7/01/2041 (Put Date 7/01/2027)	$	180,000	$180,000
West Virginia Economic Development Authority, Solid Waste Disposal Facilities Rev. (Allegheny Metallurgical Project), 4.75%, 1/01/2048 (Put Date 8/01/2024)		1,500,000	1,501,133
			$1,681,133
Industrial Revenue - Other – 0.3%
Port Beaumont, TX, Navigation District, Dock & Wharf Facility Rev. (Jefferson Gulf Coast Energy Project), “A”, 2.875%, 1/01/2041 (n)	$	115,000	$87,859
Port Beaumont, TX, Navigation District, Dock & Wharf Facility Rev. (Jefferson Gulf Coast Energy Project), “A”, 4%, 1/01/2050 (n)		200,000	167,792
			$255,651
Miscellaneous Revenue - Other – 6.3%
Matching Fund Special Purpose Securitization Corp., “A”, 5%, 10/01/2026	$	40,000	$40,876
Morgantown, WV, Building Commission Leave Rev. (Marilla Park Aquatic Complex), “A”, 4.25%, 12/01/2043		790,000	764,830
Morgantown, WV, Building Commission Leave Rev. (Marilla Park Aquatic Complex), “A”, 4.5%, 12/01/2048		540,000	524,296
New York Liberty Development Corp., Liberty Rev. (3 World Trade Center Project), “1”, 5%, 11/15/2044 (n)		580,000	580,551
West Virginia Economic Development Authority, Excess Lottery Rev., “A”, 5%, 7/01/2038		1,000,000	1,044,521
West Virginia School Building Authority, “A”, 3%, 7/01/2033		2,000,000	1,907,457
West Virginia School Building Authority, Excess Lottery Refunding Rev., “B”, 5%, 7/01/2038		265,000	295,463
West Virginia School Building Authority, Excess Lottery Refunding Rev., “B”, 5%, 7/01/2039		735,000	815,992
			$5,973,986
Multi-Family Housing Revenue – 0.3%
National Finance Authority, NH, Municipal Certificates, “1-A”, 4.375%, 9/20/2036	$	281,199	$279,432
Port Revenue – 0.1%
New York Liberty Development Corp., Liberty Refunding Rev. (1 World Trade Center Project), 2.75%, 2/15/2044	$	170,000	$127,366
Sales & Excise Tax Revenue – 4.3%
Guam Government Business Privilege Tax Refunding, “F”, 5%, 1/01/2031	$	10,000	$10,664
Guam Government Business Privilege Tax Refunding, “F”, 4%, 1/01/2042		75,000	72,134
Monongalia County, WV, Commission Special District Excise Tax Refunding & Improvement Rev. (University Town Centre Economic Opportunity Development District), “A”, 4.125%, 6/01/2043 (n)		930,000	823,785
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., “2019A-1”, 4.55%, 7/01/2040		25,000	25,093
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., “2019A-1”, 4.75%, 7/01/2053		83,000	81,791
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., “2019A-1”, 5%, 7/01/2058		2,079,000	2,070,907
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., “2019A-2”, 4.329%, 7/01/2040		158,000	155,882
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., “2019A-2”, 4.329%, 7/01/2040		83,000	81,887
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., “2019A-2”, 4.536%, 7/01/2053		1,000	952
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., “2019A-2”, 4.784%, 7/01/2058		39,000	38,382
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., Capital Appreciation, “2019A-1”, 0%, 7/01/2024		1,000	1,000
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., Capital Appreciation, “2019A-1”, 0%, 7/01/2029		7,000	5,776
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., Capital Appreciation, “2019A-1”, 0%, 7/01/2031		412,000	312,740
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., Capital Appreciation, “2019A-1”, 0%, 7/01/2033		396,000	275,313
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., Capital Appreciation, “2019A-1”, 0%, 7/01/2046		186,000	59,815
Wisconsin Public Finance Authority Limited Obligation Grant Rev. (American Dream at Meadowlands Project), “A”, 6.25%, 8/01/2027 (a)(d)(n)		120,000	93,600
			$4,109,721

2

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
Single Family Housing - State – 13.1%
West Virginia Housing Development Fund Finance Bonds, “A”, 4.55%, 11/01/2049	$	1,000,000	$1,003,934
West Virginia Housing Development Fund Finance Bonds, “C”, 2.8%, 11/01/2024		250,000	248,895
West Virginia Housing Development Fund Finance Bonds, “B”, 4.7%, 11/01/2044		1,000,000	1,008,577
West Virginia Housing Development Fund, “A”, 3.875%, 11/01/2044		1,120,000	1,033,232
West Virginia Housing Development Fund, “A”, 4.75%, 11/01/2048		1,000,000	1,006,497
West Virginia Housing Development Fund, “B”, 1.8%, 5/01/2026		485,000	458,984
West Virginia Housing Development Fund, “B”, 4.2%, 11/01/2047		1,000,000	960,430
West Virginia Housing Development Fund, “B”, 4.25%, 11/01/2052		615,000	576,772
West Virginia Housing Development Fund, “B”, 4.7%, 11/01/2053		980,000	979,835
West Virginia Housing Development Fund, “C”, 4.45%, 11/01/2037		1,000,000	1,029,739
West Virginia Housing Development Fund, “C”, 4.625%, 11/01/2042		1,000,000	1,019,445
West Virginia Housing Development Fund, “C”, 4.8%, 11/01/2047		1,000,000	1,008,884
West Virginia Housing Development Fund, “D”, 4.6%, 11/01/2043		1,000,000	1,014,103
West Virginia Housing Development Fund, “D”, 4.8%, 11/01/2048		1,000,000	1,009,580
			$12,358,907
State & Local Agencies – 8.7%
Berkeley County, WV, Building Commission Lease Rev. (Berkeley County Day Report Center and Public Safety Building Projects), 4%, 12/01/2042	$	1,740,000	$1,699,123
North Carolina Turnpike Authority, Triangle Expressway System Appropriation Rev., Capital Appreciation, 0%, 1/01/2044		1,640,000	695,217
Putnam County, WV, Building Commission Lease Rev. (Sheriff's Headquarters), “A”, BAM, 4.25%, 5/01/2042		500,000	506,441
Putnam County, WV, Building Commission Lease Rev. (Sheriff's Headquarters), “A”, BAM, 4.25%, 5/01/2047		500,000	500,860
Putnam County, WV, Building Commission Lease Rev. (Sheriff's Headquarters), “A”, BAM, 4.375%, 5/01/2052		560,000	558,451
West Virginia Economic Development Authority, Lease Rev. (Correctional, Juvenile and Public Safety Facilities), “A”, 5%, 6/01/2029		2,000,000	2,009,983
West Virginia Economic Development Authority, Lease Rev. (State Office Building), “B”, NPFG, 5.25%, 1/01/2025		115,000	115,134
West Virginia Economic Development Authority, Lease Rev. (State Office Building), “B”, NPFG, 5.25%, 1/01/2030		1,355,000	1,358,493
West Virginia Hospital Finance Authority Hospital Rev. (Veterans Nursing Home), 5.5%, 3/01/2034		795,000	795,972
			$8,239,674
Student Loan Revenue – 0.5%
New Jersey Higher Education Student Assistance Authority, Senior Student Loan Rev., “B”, 4%, 12/01/2041	$	485,000	$464,902
Tax - Other – 2.6%
Chicago, IL, Board of Education, Dedicated Capital Improvement Tax Bond, 5%, 4/01/2045	$	65,000	$69,064
Chicago, IL, Board of Education, Dedicated Capital Improvement Tax Bond, 5.75%, 4/01/2048		175,000	194,678
Monongalia County, WV, Senior Tax Increment Improvement Refunding Rev. (Development District No. 4 - University Town Centre), “A”, 6%, 6/01/2053 (n)		1,000,000	1,070,687
Virgin Islands Public Finance Authority Rev. (Gross Receipts), AGM, 5%, 10/01/2032		1,000,000	1,009,480
Wisconsin Public Finance Authority Limited Obligation PILOT Rev. (American Dream at Meadowlands Project), 7%, 12/01/2050		100,000	99,634
			$2,443,543
Tax Assessment – 1.4%
Morgantown, WV, Tax Increment Rev., Parking Garage Project, “A”, 5%, 6/01/2033	$	455,000	$432,660
Ohio County, WV, Commission Tax Increment Rev. (Fort Henry Centre), 4%, 6/01/2034		1,000,000	924,159
			$1,356,819
Tobacco – 0.9%
Buckeye, OH, Tobacco Settlement Financing Authority Senior Asset-Backed Refunding, 2020A-2, “1”, 4%, 6/01/2048	$	125,000	$115,209
Buckeye, OH, Tobacco Settlement Financing Authority Senior Asset-Backed Refunding, 2020B-2, “2”, 5%, 6/01/2055		500,000	460,930
Golden State, CA, Tobacco Securitization Corp., Tobacco Settlement Rev., Taxable, “B-1”, 3.85%, 6/01/2050		275,000	257,916
			$834,055
Toll Roads – 2.3%
Virginia Small Business Financing Authority Senior Lien Rev. (Elizabeth River Crossings Opco LLC Project), 3%, 1/01/2041	$	325,000	$266,339
West Virginia Parkways Authority, Senior Lien Turnpike Toll Rev., 4%, 6/01/2042		1,000,000	990,804
West Virginia Parkways Authority, Turnpike Toll Rev., 4%, 6/01/2047		1,000,000	964,802
			$2,221,945

3

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
Transportation - Special Tax – 2.3%
New Jersey Transportation Trust Fund Authority, “AA”, 4%, 6/15/2050	$	1,000,000	$952,200
New Jersey Transportation Trust Fund Authority, Transportation Program, “BB”, 4%, 6/15/2044		1,225,000	1,193,342
			$2,145,542
Universities - Colleges – 8.7%
Fairmont, WV, State University Board of Governors Refunding Rev., “A”, 5%, 6/01/2032	$	1,050,000	$1,144,894
Marshall University, WV, Board of Governors Rev., “A”, AGM, 3%, 5/01/2046		1,000,000	792,172
Marshall University, WV, Board of Governors Rev., “A”, AGM, 4%, 5/01/2050		1,500,000	1,358,710
Puerto Rico Industrial, Tourist, Educational, Medical & Environmental Control Facilities Financing Authority, Higher Education Rev. (International American University of Puerto Rico Project), 5%, 10/01/2031		100,000	100,112
West Virginia University, Board of Governors Improvement Rev. (West Virginia University Project), “A”, 5%, 10/01/2044		1,000,000	1,080,343
West Virginia University, Board of Governors Improvement Rev. (West Virginia University Project), “A”, 5%, 10/01/2049		2,000,000	2,085,303
West Virginia University, University Systems Rev., “A”, NPFG, 5.25%, 4/01/2028		1,665,000	1,711,455
			$8,272,989
Universities - Dormitories – 1.1%
West Virginia Economic Development Authority, University Facilities Refunding Rev. (Provident Group - Marshall Properties LLC - Marshall University Project), “A-1”, AGM, 5%, 7/01/2042	$	1,000,000	$1,060,647
Utilities - Investor Owned – 2.8%
West Virginia Economic Development Authority, Solid Waste Disposal Facilities Refunding Rev. (Wheeling Power Co. - Mitchell Project), “A”, 3%, 6/01/2037 (Put Date 6/18/2027)	$	1,000,000	$974,110
West Virginia Economic Development Authority, Solid Waste Disposal Facilities Rev. (Appalachian Power Company - Amos Project), “A”, 0.625%, 12/01/2038 (Put Date 12/15/2025)		750,000	701,894
West Virginia Economic Development Authority, Solid Waste Disposal Facilities Rev. (Appalachian Power Company - Amos Project), “A”, 1%, 1/01/2041 (Put Date 9/01/2025)		1,000,000	952,583
			$2,628,587
Utilities - Municipal Owned – 1.1%
Guam Power Authority Rev., “A”, AGM, 5%, 10/01/2033	$	435,000	$436,388
Puerto Rico Electric Power Authority Refunding Rev., “DDD”, 5%, 7/01/2020 (a)(d)		10,000	5,013
Puerto Rico Electric Power Authority Rev., “A”, 5%, 7/01/2029 (a)(d)		285,000	142,856
Puerto Rico Electric Power Authority Rev., “AAA”, 5.25%, 7/01/2021 (a)(d)		20,000	10,025
Puerto Rico Electric Power Authority Rev., “AAA”, 5.25%, 7/01/2030 (a)(d)		10,000	5,013
Puerto Rico Electric Power Authority Rev., “CCC”, 5.25%, 7/01/2027 (a)(d)		100,000	50,125
Puerto Rico Electric Power Authority Rev., “TT”, 5%, 7/01/2021 (a)(d)		40,000	20,050
Puerto Rico Electric Power Authority Rev., “TT”, 5%, 7/01/2023 (a)(d)		50,000	25,062
Puerto Rico Electric Power Authority Rev., “TT”, 5%, 7/01/2027 (a)(d)		10,000	5,013
Puerto Rico Electric Power Authority Rev., “TT”, 5%, 7/01/2037 (a)(d)		145,000	72,681
Puerto Rico Electric Power Authority Rev., “VV”, NPFG, 5.25%, 7/01/2030		135,000	133,227
Puerto Rico Electric Power Authority Rev., “VV”, NPFG, 5.25%, 7/01/2034		10,000	9,893
Puerto Rico Electric Power Authority Rev., “WW”, 5.375%, 7/01/2022 (a)(d)		10,000	5,013
Puerto Rico Electric Power Authority Rev., “WW”, 5.25%, 7/01/2025 (a)(d)		20,000	10,025
Puerto Rico Electric Power Authority Rev., “ZZ”, 5.25%, 7/01/2023 (a)(d)		75,000	37,594
Puerto Rico Electric Power Authority Rev., “ZZ”, 5.25%, 7/01/2024 (a)(d)		20,000	10,025
Puerto Rico Electric Power Authority Rev., “ZZ”, 5.25%, 7/01/2026 (a)(d)		65,000	32,581
Puerto Rico Electric Power Authority Rev., Taxable, “EEE”, 6.05%, 7/01/2032 (a)(d)		50,000	25,062
			$1,035,646
Utilities - Other – 2.5%
Black Belt Energy Gas District, AL, Gas Project Rev., “A”, 4%, 6/01/2051 (Put Date 12/01/2031)	$	280,000	$281,005
Black Belt Energy Gas District, AL, Gas Project Rev., “C-1”, 5.25%, 2/01/2053 (Put Date 6/01/2029)		565,000	596,265
California Community Choice Financing Authority, Clean Energy Project Rev., “C”, 5.25%, 1/01/2054 (Put Date 10/01/2031)		560,000	590,167
Southeast Alabama Energy Authority Commodity Supply Rev. (Project No. 5), “A”, 5.25%, 1/01/2054 (Put Date 7/01/2029)		510,000	539,284
Tennergy Corp., TN, Gas Supply Rev., “A”, 5.5%, 10/01/2053 (Put Date 12/01/2030)		310,000	331,220
			$2,337,941

4

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
Water & Sewer Utility Revenue – 10.4%
Berkeley County, WV, Public Service Sewer District, “A”, BAM, 5%, 6/01/2036	$	1,700,000	$1,733,306
Greenbrier County, WV, Public Service District No. 1, Sewerage System Improvement Rev., “A”, BAM, 4.625%, 10/01/2052		1,000,000	1,011,085
Guam Waterworks Authority Rev. (Water and Wastewater System), 5%, 1/01/2046		180,000	182,888
Guam Waterworks Authority Rev. (Water and Wastewater System), “A”, 5%, 1/01/2050		135,000	138,685
Michigan Finance Authority Local Government Loan Program Rev. (Detroit Water and Sewerage Department Sewage Disposal System Rev. Refunding Second Lien Local Project), “C-7”, NPFG, 5%, 7/01/2032		35,000	35,027
Michigan Finance Authority Local Government Loan Program Rev. (Detroit Water and Sewerage Department Water Supply System Rev. Refunding Second Lien Local Project), “D-6”, NPFG, 5%, 7/01/2036		40,000	40,030
Michigan Finance Authority Local Government Loan Program Rev. (Detroit Water and Sewerage Department Water Supply System Rev. Refunding Senior Lien Local Project), “D-1”, AGM, 5%, 7/01/2037		50,000	50,038
Mississippi Development Bank Special Obligation (Jackson Water and Sewer System Rev. Bond Project), AGM, 6.875%, 12/01/2040		75,000	75,269
Morgantown, WV, Combined Utility System Rev., “A”, AGM, 5%, 12/01/2041		1,000,000	1,025,900
Morgantown, WV, Combined Utility System Rev., “B”, 5%, 12/01/2043		2,000,000	2,071,578
West Virginia Water Development Authority Rev. (Loan Program II), “A-II”, 5%, 11/01/2033		1,475,000	1,519,038
West Virginia Water Development Authority Rev. (Loan Program IV), “A-IV”, 5%, 11/01/2038		500,000	528,031
Wheeling, WV, Combined Waterworks and Sewerage System Rev., “A”, BAM, 4%, 6/01/2051		1,500,000	1,422,790
			$9,833,665
Total Municipal Bonds			$91,975,060
Bonds – 0.3%
Transportation - Services – 0.3%
Toll Road Investors Partnership II LP, Capital Appreciation, NPFG, 0%, 2/15/2025 (n)	$	167,000	$160,092
Toll Road Investors Partnership II LP, Capital Appreciation, NPFG, 0%, 2/15/2043 (n)		363,682	108,341
Total Bonds			$268,433
Contingent Value Instruments – 0.1%
General Obligations - General Purpose – 0.1%
Commonwealth of Puerto Rico, General Obligation Contingent Value Instrument, 11/01/2043	$	180,563	$110,595
Investment Companies (h) – 1.8%
Money Market Funds – 1.8%
MFS Institutional Money Market Portfolio, 5.39% (v)		1,733,929	$1,734,102
Other Assets, Less Liabilities – 0.5%			431,676
Net Assets – 100.0%			$94,519,866

(a)	Non-income producing security.
(d)	In default.
(h)	An affiliated issuer, which may be considered one in which the fund owns 5% or more of the outstanding voting securities, or a company which is under common control. At period end, the aggregate values of the fund's investments in affiliated issuers and in unaffiliated issuers were $1,734,102 and $92,354,088, respectively.
(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 $3,092,707, representing 3.3% of net assets.
(v)	Affiliated issuer that is available only to investment companies managed by MFS. The rate quoted for the MFS Institutional Money Market Portfolio is the annualized seven-day yield of the fund at period end.

The following abbreviations are used in this report and are defined:
AAC	Ambac Assurance Corp.
AGM	Assured Guaranty Municipal
BAM	Build America Mutual
NPFG	National Public Finance Guarantee Corp.

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

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Supplemental Information

6/30/24 (unaudited)

The fund is an investment company and accordingly follows the investment company accounting and reporting guidance of the Financial Accounting Standards Board (FASB) Accounting Standards Codification Topic 946 Financial Services - Investment Companies.

(1) Investment Valuations

Subject to its oversight, the fund's Board of Trustees has delegated primary responsibility for determining or causing to be determined the value of the fund’s investments to MFS as the fund's adviser, pursuant to the fund’s valuation policy and procedures which have been adopted by the adviser and approved by the Board. In accordance with Rule 2a-5 under the Investment Company Act of 1940, the Board of Trustees designated the adviser as the “valuation designee” of the fund. If the adviser, as valuation designee, determines that reliable market quotations are not readily available for an investment, the investment is valued at fair value as determined in good faith by the adviser in accordance with the adviser’s fair valuation policy and procedures.

Under the fund's valuation policy and procedures, debt instruments and floating rate loans, 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 may be valued at amortized cost, which approximates market value. Open-end investment companies are generally valued at net asset value per share.

Under the fund’s valuation policy and procedures, market quotations are not considered to be readily available for debt instruments, floating rate loans, and many types of derivatives. These investments are generally valued at fair value based on information from third-party pricing services or otherwise determined by the adviser in accordance with the adviser’s fair valuation policy and procedures. 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. In determining values, third-party pricing services can utilize both transaction data and market information such as yield, quality, coupon rate, maturity, type of issue, trading characteristics, spreads and other market data. An investment may also be valued at fair value if the adviser determines that the 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 halt 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 significant unobservable inputs, which may include the adviser's own assumptions in determining the fair value of investments. The following is a summary of the levels used as of June 30, 2024 in valuing the fund's assets and liabilities:

Financial Instruments	Level 1	Level 2	Level 3	Total
Municipal Bonds	$—	$92,085,655	$—	$92,085,655
U.S. Corporate Bonds	—	268,433	—	268,433
Mutual Funds	1,734,102	—	—	1,734,102
Total	$1,734,102	$92,354,088	$—	$94,088,190

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

(2) Investments in Affiliated Issuers

An affiliated issuer may be considered one in which the fund owns 5% or more of the outstanding voting securities, or a company which is under common control. For the purposes of this report, the following were affiliated issuers:

Affiliated Issuers	Beginning Value	Purchases	Sales Proceeds	Realized Gain (Loss)	Change in Unrealized Appreciation or Depreciation	Ending Value
MFS Institutional Money Market Portfolio	$734,986	$4,622,514	$3,623,491	$66	$27	$1,734,102

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Supplemental Information (unaudited) – continued

Affiliated Issuers	Dividend Income	Capital Gain Distributions
MFS Institutional Money Market Portfolio	$24,874	$—

(3) Jurisdiction Weightings

Jurisdiction weighting percentages based on net assets, as of June 30, 2024, are as follows:

West Virginia	78.6%
Puerto Rico	4.7%
New Jersey	2.8%
Alabama	1.5%
Illinois	1.4%
California	1.2%
New York	1.2%
U.S. Virgin Islands	1.1%
Virginia	1.1%
Guam	0.9%
Arkansas	0.7%
North Carolina	0.7%
Ohio	0.6%
Michigan	0.4%
Pennsylvania	0.4%
Tennessee	0.4%
New Hampshire	0.3%
Texas	0.3%
Wisconsin	0.2%
Mississippi	0.1%

The jurisdiction weighting percentages include both accrued interest amounts and equivalent exposure from any derivatives holdings, if applicable.

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