Quarterly Report

June 30, 2021

MFS^® New York
Municipal Bond Fund

MNY-Q1

Portfolio of Investments

6/30/21 (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 – 100.0%
Airport Revenue – 2.8%
Albany County, NY, Airport Authority Rev., “A”, 5%, 12/15/2043	$	1,500,000	$1,856,947
Dallas and Fort Worth, TX, International Airport Rev., “B”, 5%, 11/01/2044		245,000	259,660
Dallas and Fort Worth, TX, International Airport Rev., “C”, 5%, 11/01/2045		170,000	172,569
New York Transportation Development Corp., Special Facilities Rev. (Terminal 4 John F. Kennedy International Airport Project), “A”, 4%, 12/01/2040		1,500,000	1,776,139
Niagara, NY, Frontier Transportation Authority Rev. (Buffalo-Niagara International Airport), “A”, 5%, 4/01/2028		650,000	723,405
Niagara, NY, Frontier Transportation Authority Rev. (Buffalo-Niagara International Airport), “A”, 5%, 4/01/2029		500,000	555,742
Niagara, NY, Frontier Transportation Authority Rev. (Buffalo-Niagara International Airport), “A”, 5%, 4/01/2035		1,000,000	1,258,197
Niagara, NY, Frontier Transportation Authority Rev. (Buffalo-Niagara International Airport), “A”, 5%, 4/01/2038		1,000,000	1,249,549
Wayne County, MI, Airport Authority Rev. (Detroit Metropolitan Wayne County Airport), “B”, 5%, 12/01/2044		90,000	103,009
Wayne County, MI, Airport Authority Rev. (Detroit Metropolitan Wayne County Airport), “B”, BAM, 5%, 12/01/2039		15,000	17,196
Wayne County, MI, Airport Authority Rev. (Detroit Metropolitan Wayne County Airport), “C”, 5%, 12/01/2039		80,000	90,838
Wayne County, MI, Airport Authority Rev. (Detroit Metropolitan Wayne County Airport), “C”, 5%, 12/01/2044		130,000	147,377
			$8,210,628
General Obligations - General Purpose – 11.6%
Bridgeview, IL, Stadium and Redevelopment Projects, AAC, 5.14%, 12/01/2036	$	615,000	$650,303
Commonwealth of Puerto Rico, “A”, AGM, 5.375%, 7/01/2025		45,000	46,142
Commonwealth of Puerto Rico, General Obligation, “A”, 8%, 7/01/2035 (a)(d)		2,935,000	2,428,712
Commonwealth of Puerto Rico, Public Improvement, “A-4”, AGM, 5%, 7/01/2031		165,000	169,946
Nassau County, NY, General Improvement, “B”, 5%, 4/01/2023		1,820,000	1,974,000
Nassau County, NY, General Improvement, “B”, AGM, 5%, 7/01/2035		2,175,000	2,718,654
Nassau County, NY, General Improvement, “B”, AGM, 5%, 7/01/2037		3,000,000	3,738,488
New York, NY, “B-1”, 5%, 12/01/2041		3,000,000	3,645,397
New York, NY, “D-1”, 5%, 12/01/2038		2,000,000	2,513,900
New York, NY, “J”, FGIC, 5.5%, 2/15/2026		5,000	5,022
New York, NY, General Obligation, “A”, 3%, 3/15/2035		3,000,000	3,445,298
New York, NY, General Obligation, “F-1”, 5%, 4/01/2043		3,000,000	3,682,124
Oyster Bay, NY, Public Improvement Rev., AGM, 4%, 3/01/2026		350,000	404,274
Oyster Bay, NY, Public Improvement Rev., AGM, 4%, 3/01/2027		2,550,000	3,012,365
Oyster Bay, NY, Public Improvement Rev., AGM, 4%, 3/01/2028		850,000	1,022,280
Poughkeepsie, NY, Dutchess County Public Improvement, 5%, 6/01/2031		635,000	705,216
Puerto Rico Public Buildings Authority Government Facilities Rev., “M-2”, AAC, 10%, 7/01/2035		115,000	121,557
Puerto Rico Public Buildings Authority Rev., Guaranteed, “D”, AAC, 5.45%, 7/01/2030		270,000	279,089
State of Illinois, General Obligation, 5.5%, 5/01/2039		215,000	278,475
State of Illinois, General Obligation, 5.75%, 5/01/2045		200,000	259,539
State of Illinois, General Obligation, “A”, 5%, 3/01/2030		335,000	430,894
State of Illinois, General Obligation, “A”, 5%, 3/01/2031		490,000	640,898
Yonkers, NY, General Obligation, “A”, AGM, 5%, 2/15/2033		300,000	396,076
Yonkers, NY, General Obligation, “A”, AGM, 5%, 2/15/2034		300,000	394,217
Yonkers, NY, School District, “B”, AGM, 5%, 2/15/2033		360,000	475,291
Yonkers, NY, School District, “B”, AGM, 5%, 2/15/2034		380,000	499,740
			$33,937,897
Healthcare Revenue - Hospitals – 7.5%
Broome County, NY, Local Development Corp. Rev. (United Health Services Hospitals, Inc.), AGM, 4%, 4/01/2050	$	2,000,000	$2,311,180
Buffalo & Erie County, NY, Industrial Land Development Corp. Rev. (Catholic Health System, Inc. Project), 5%, 7/01/2026		450,000	523,061
Buffalo & Erie County, NY, Industrial Land Development Corp. Rev. (Catholic Health System, Inc. Project), 5%, 7/01/2027		300,000	347,866
Buffalo & Erie County, NY, Industrial Land Development Corp. Rev. (Catholic Health System, Inc. Project), 5%, 7/01/2029		590,000	682,788
Dutchess County, NY, Local Development Corp. Rev. (Health Quest Systems, Inc. Project), 4%, 7/01/2041		1,500,000	1,681,315
Dutchess County, NY, Local Development Corp. Rev. (Health Quest Systems, Inc. Project), “A”, 5%, 7/01/2044 (Prerefunded 7/01/2024)		1,000,000	1,137,878
Jefferson County, NY, Civic Development Corp. Rev. (Samaritan Medical Center), “A”, 5%, 11/01/2037		2,000,000	2,410,853
Knox County, TN, Health, Educational & Housing Facility Board Rev. (University Health Systems, Inc.), “A”, 5%, 9/01/2030		1,250,000	1,551,856
Miami-Dade County, FL, Health Facilities Authority Hospital Rev., Unrefunded Balance, 6%, 8/01/2030		40,000	40,181
Monroe County, NY, Industrial Development Corp. Rev. (Rochester General Hospital Project), 5%, 12/01/2046		2,000,000	2,315,516

1

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
Healthcare Revenue - Hospitals – continued
Nassau County, NY, Local Economic Assistance Corp. Rev. (Catholic Health Services of Long Island Obligated Group Project), 5%, 7/01/2032	$	1,000,000	$1,123,577
New Jersey Health Care Facilities, Financing Authority Rev. (University Hospital), “A”, AGM, 5%, 7/01/2046		170,000	196,582
New York Dormitory Authority Rev. (Maimonides Medical Center), FHA, 4%, 8/01/2043		1,000,000	1,156,719
New York Dormitory Authority Rev. (Montefiore Obligated Group), “A”, 4%, 9/01/2045		1,500,000	1,726,395
New York Dormitory Authority Rev., Non-State Supported Debt (Orange Regional Medical Center Obligated Group Rev.), 5%, 12/01/2035 (n)		800,000	966,866
Oneida County, NY, Local Development Corp. Rev. (Mohawk Valley Health System Project), “A”, AGM, 4%, 12/01/2037		1,000,000	1,166,190
Oneida County, NY, Local Development Corp. Rev. (Mohawk Valley Health System Project), “A”, AGM, 4%, 12/01/2038		1,000,000	1,163,706
Royal Oak, MI, Hospital Finance Authority Rev. (William Beaumont Hospital), 5%, 9/01/2039		1,290,000	1,434,869
Westchester County, NY, Health Care Corp. Rev., “B”, “C-2”, 6%, 11/01/2030		130,000	130,540
			$22,067,938
Healthcare Revenue - Long Term Care – 1.9%
Brookhaven, NY, Local Development Corp. Rev. (Active Retirement Community, Inc. d/b/a/ Jefferson's Ferry Project), 5.25%, 11/01/2036	$	1,000,000	$1,190,272
Brookhaven, NY, Local Development Corp. Rev. (Active Retirement Community, Inc. d/b/a/ Jefferson's Ferry Project), “A”, 4%, 11/01/2045		2,000,000	2,181,649
Buffalo & Erie County, NY, Industrial Land Development Corp. Rev. (Orchard Park CCRC, Inc. Project), 5%, 11/15/2037		750,000	844,009
Tompkins County, NY, Development Corp. Continuing Care Retirement Community Rev. (Kendal at Ithaca, Inc. Project), “A”, 5%, 7/01/2044		915,000	997,820
Ulster County, NY, Capital Resource Corp. Rev. (Woodland Pond at New Paltz Project), 4%, 9/15/2025		355,000	351,734
			$5,565,484
Industrial Revenue - Airlines – 3.2%
New York Transportation Development Corp., Special Facilities Rev. (American Airlines, Inc. John F. Kennedy International Airport Project), 3%, 8/01/2031	$	1,500,000	$1,589,810
New York Transportation Development Corp., Special Facilities Rev. (American Airlines, Inc. John F. Kennedy International Airport Project), 5%, 8/01/2031		1,000,000	1,003,551
New York Transportation Development Corp., Special Facilities Rev. (American Airlines, Inc. John F. Kennedy International Airport Project), 5.375%, 8/01/2036		1,000,000	1,281,832
New York Transportation Development Corp., Special Facilities Rev. (Delta Airlines, Inc. LaGuardia Airport Terminals C&D Redevelopment Project), 5%, 1/01/2034		1,000,000	1,222,192
New York Transportation Development Corp., Special Facilities Rev. (Delta Airlines, Inc. LaGuardia Airport Terminals C&D Redevelopment Project), 5%, 1/01/2036		2,000,000	2,436,175
New York Transportation Development Corp., Special Facilities Rev. (Delta Airlines, Inc. LaGuardia Airport Terminals C&D Redevelopment Project), 4.375%, 10/01/2045		1,500,000	1,801,946
			$9,335,506
Industrial Revenue - Environmental Services – 0.4%
New York Environmental Facilities Corp. Rev., Solid Waste Disposal (Casella Waste Management, Inc. Project), 2.75%, 9/01/2050 (Put Date 9/02/2025) (n)	$	1,000,000	$1,056,840
Industrial Revenue - Other – 0.8%
Onondaga County, NY, Industrial Development Agency Sewer Facilities Rev. (Bristol-Meyers Squibb Co. Project), 5.75%, 3/01/2024	$	1,000,000	$1,136,894
Port Beaumont, TX, Navigation District Facility Rev. (Jefferson Gulf Coast Energy Project), “A”, 3.625%, 1/01/2035 (n)		200,000	207,184
Tuscaloosa County, AL, Industrial Development Authority, Gulf Opportunity Zone (Hunt Refining Project), “A”, 4.5%, 5/01/2032 (n)		339,085	368,412
Tuscaloosa County, AL, Industrial Development Authority, Gulf Opportunity Zone (Hunt Refining Project), “A”, 5.25%, 5/01/2044 (n)		495,000	580,105
			$2,292,595
Industrial Revenue - Paper – 0.3%
Build NYC Resource Corp. Solid Waste Disposal Rev. (Pratt Paper, Inc. Project), 4.5%, 1/01/2025 (n)	$	885,000	$950,242

2

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
Miscellaneous Revenue - Other – 5.6%
Indiana Finance Authority Rev. (Ohio River Bridges East End Crossing Project), “A”, 5%, 7/01/2040	$	205,000	$222,499
New York City Convention Center Development Corp., Capital Appreciation, “B”, AGM, 0%, 11/15/2043		680,000	408,601
New York Liberty Development Corp., Liberty Rev. (3 World Trade Center Project), “1”, 5%, 11/15/2044 (n)		1,940,000	2,148,077
New York Liberty Development Corp., Liberty Rev. (3 World Trade Center Project), “2”, 5.375%, 11/15/2040 (n)		1,500,000	1,692,370
New York Liberty Development Corp., Liberty Rev. (4 World Trade Center Project), 5%, 11/15/2044		1,000,000	1,016,059
New York Liberty Development Corp., Liberty Rev. (7 World Trade Center Project), 5%, 9/15/2040		1,665,000	1,717,857
New York, NY, Industrial Development Agency Pilot Refunding Rev., (Queens Stadium Project), “A”, AGM, 5%, 1/01/2029		1,250,000	1,608,138
New York, NY, Industrial Development Agency Pilot Refunding Rev., (Queens Stadium Project), “A”, AGM, 5%, 1/01/2030		1,500,000	1,967,352
New York, NY, Industrial Development Agency, Airport Facilities Rev. (Transportation Infrastructure Properties LLC), 5%, 7/01/2028		3,000,000	3,118,693
New York, NY, Trust for Cultural Resources Refunding Rev. (Carnegie Hall), 5%, 12/01/2038		250,000	319,225
New York, NY, Trust for Cultural Resources Refunding Rev. (Carnegie Hall), 5%, 12/01/2039		250,000	318,072
Syracuse, NY, Industrial Development Agency PILOT Rev. (Carousel Center Project), “A”, 5%, 1/01/2034		750,000	750,896
Syracuse, NY, Industrial Development Agency PILOT Rev. (Carousel Center Project), “A”, 5%, 1/01/2036		1,000,000	997,956
			$16,285,795
Multi-Family Housing Revenue – 3.0%
New York Housing Finance Agency Affordable Housing Rev. (Climate Bond), “B”, 3.7%, 11/01/2038	$	1,450,000	$1,581,945
New York Housing Finance Agency Affordable Housing Rev. (Climate Bond), “I”, 4%, 11/01/2043		1,015,000	1,123,656
New York, NY, Housing Development Corp., Multi-Family Housing Rev. (8 Spruce Street), “E”, 3.5%, 2/15/2048		106,740	108,146
New York, NY, Housing Development Corp., Multi-Family Housing Rev. (8 Spruce Street), “F”, 4.5%, 2/15/2048		750,000	778,279
New York, NY, Housing Development Corp., Multi-Family Housing Rev. (Sustainable Neighborhood Bonds), “A-3-A”, 3.8%, 11/01/2039		2,000,000	2,187,247
New York, NY, Housing Development Corp., Multi-Family Housing Rev. (Sustainable Neighborhood Bonds), “C-1-A”, 3.95%, 11/01/2048		2,810,000	3,045,067
			$8,824,340
Port Revenue – 3.9%
Port Authority of NY & NJ (205th Series), 5%, 11/15/2042	$	2,000,000	$2,488,887
Port Authority of NY & NJ (211th Series), 4%, 9/01/2043		2,000,000	2,336,904
Port Authority of NY & NJ (220th Series), 5%, 11/01/2044		3,000,000	3,735,072
Port Authority of NY & NJ (221st Series), 4%, 7/15/2045		2,000,000	2,353,301
Port Authority of NY & NJ (226th Series), 5%, 10/15/2032 (w)		500,000	667,069
			$11,581,233
Sales & Excise Tax Revenue – 3.4%
Guam Government Business Privilege Tax Refunding, “F”, 5%, 1/01/2029 (w)	$	20,000	$24,780
Guam Government Business Privilege Tax Refunding, “F”, 5%, 1/01/2030 (w)		15,000	18,864
Guam Government Business Privilege Tax Refunding, “F”, 5%, 1/01/2031 (w)		20,000	25,530
Guam Government Business Privilege Tax Refunding, “F”, 4%, 1/01/2036 (w)		80,000	92,830
Guam Government Business Privilege Tax Refunding, “F”, 4%, 1/01/2042 (w)		105,000	119,624
Guam Government Business Privilege Tax Rev., “D”, 5%, 11/15/2031		750,000	863,458
Illinois Sales Tax Securitization Corp., Second Lien, “A”, 5%, 1/01/2026		110,000	130,730
Illinois Sales Tax Securitization Corp., Second Lien, “A”, 5%, 1/01/2027		235,000	287,310
Illinois Sales Tax Securitization Corp., Second Lien, “A”, 5%, 1/01/2028		210,000	263,257
Illinois Sales Tax Securitization Corp., Second Lien, “A”, 5%, 1/01/2029		45,000	57,669
Illinois Sales Tax Securitization Corp., Second Lien, “A”, 5%, 1/01/2030		105,000	137,220
Illinois Sales Tax Securitization Corp., Second Lien, “A”, 5%, 1/01/2036		95,000	121,507
Illinois Sales Tax Securitization Corp., Second Lien, “A”, 5%, 1/01/2037		130,000	166,445
Illinois Sales Tax Securitization Corp., Second Lien, “A”, 4%, 1/01/2038		55,000	65,081
Illinois Sales Tax Securitization Corp., Second Lien, “A”, 4%, 1/01/2039		40,000	47,225
Illinois Sales Tax Securitization Corp., Second Lien, “A”, 4%, 1/01/2040		60,000	71,036
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., “2019A-1”, 4.55%, 7/01/2040		63,000	71,545
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., “2019A-1”, 5%, 7/01/2058		2,186,000	2,519,620
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., “2019A-2”, 4.329%, 7/01/2040		567,000	635,499
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., “2019A-2”, 4.329%, 7/01/2040		210,000	235,370
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., “2019A-2”, 4.536%, 7/01/2053		4,000	4,490
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., “2019A-2”, 4.784%, 7/01/2058		90,000	102,499
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., Capital Appreciation, “2019A-1”, 0%, 7/01/2024		7,000	6,723

3

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
Sales & Excise Tax Revenue – continued
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., Capital Appreciation, “2019A-1”, 0%, 7/01/2027	$	103,000	$94,293
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., Capital Appreciation, “2019A-1”, 0%, 7/01/2029		17,000	14,827
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., Capital Appreciation, “2019A-1”, 0%, 7/01/2031		942,000	759,408
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., Capital Appreciation, “2019A-1”, 0%, 7/01/2033		904,000	678,833
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., Capital Appreciation, “2019A-1”, 0%, 7/01/2046		5,509,000	1,811,693
Wisconsin Public Finance Authority Limited Obligation Grant Rev. (American Dream at Meadowlands Project), “A”, 6.25%, 8/01/2027 (n)		440,000	503,410
Wisconsin Public Finance Authority Limited Obligation Grant Rev. (American Dream at Meadowlands Project), ”A“, 5.625%, 8/01/2024 (n)		100,000	104,883
			$10,035,659
Secondary Schools – 2.7%
Buffalo & Erie County, NY, Industrial Land Development Corp. Rev. (Charter School for Applied Technologies Project), “A”, 5%, 6/01/2035	$	1,000,000	$1,101,150
Build NYC Resource Corp. Rev. (Academic Leadership Charter School Project), 4%, 6/15/2025		220,000	246,784
Build NYC Resource Corp. Rev. (Academic Leadership Charter School Project), 4%, 6/15/2029		320,000	373,696
Build NYC Resource Corp. Rev. (Academic Leadership Charter School Project), 4%, 6/15/2036		400,000	459,194
Build NYC Resource Corp. Rev. (International Leadership Charter School Project), 6%, 7/01/2043		750,000	779,542
Build NYC Resource Corp. Rev. (New World Preparatory Charter School Project), “A”, 4%, 6/15/2031 (n)		350,000	392,487
Build NYC Resource Corp. Rev. (New World Preparatory Charter School Project), “A”, 4%, 6/15/2041 (n)		610,000	672,079
Build NYC Resource Corp. Rev. (New World Preparatory Charter School Project), “A”, 4%, 6/15/2051 (n)		735,000	796,492
Build NYC Resource Corp. Rev. (New World Preparatory Charter School Project), “A”, 4%, 6/15/2056 (n)		530,000	571,989
Build NYC Resource Corp. Rev. (Packer Collegiate Institute Project), 5%, 6/01/2040		675,000	750,972
Rensselaer County, NY, Industrial Development Agency, Civic Facility Rev. (Emma Willard School Refunding Project), 5%, 1/01/2034		450,000	515,734
Rensselaer County, NY, Industrial Development Agency, Civic Facility Rev. (Emma Willard School Refunding Project), 5%, 1/01/2035		500,000	572,324
Rensselaer County, NY, Industrial Development Agency, Civic Facility Rev. (Emma Willard School Refunding Project), 5%, 1/01/2036		645,000	737,003
			$7,969,446
Single Family Housing - State – 3.1%
Maryland Community Development Administration, Department of Housing & Community Development Housing Rev., “A”, 4.25%, 9/01/2049	$	1,090,000	$1,212,887
New York Mortgage Agency Homeowner Mortgage Rev., 4%, 10/01/2037		2,410,000	2,593,587
New York Mortgage Agency Rev., “212”, AMT, 3.7%, 10/01/2033		2,000,000	2,146,535
New York Mortgage Agency Rev., “217”, 3.625%, 4/01/2039		955,000	1,046,315
Tennessee Housing Development Agency, Residential Finance Program Rev., “1”, 4.25%, 1/01/2050		1,070,000	1,188,832
Texas Department of Housing & Community Affairs Residential Mortgage Rev., “A”, FNMA, 4.75%, 1/01/2049		690,000	776,245
			$8,964,401
State & Local Agencies – 5.4%
Delaware Valley, PA, Regional Finance Authority, “C”, FLR, 0.84% (LIBOR - 3mo. + 0.75%), 6/01/2037	$	1,430,000	$1,380,017
New Jersey Building Authority Rev., Unrefunded Balance, “A”, BAM, 5%, 6/15/2029		30,000	36,036
New Jersey Economic Development Authority Rev. (School Facilities Construction), 5%, 6/15/2032		15,000	19,537
New Jersey Economic Development Authority Rev. (School Facilities Construction), 5%, 6/15/2033		10,000	12,982
New Jersey Economic Development Authority Rev. (School Facilities Construction), 4%, 6/15/2034		10,000	11,963
New Jersey Economic Development Authority Rev. (School Facilities Construction), 4%, 6/15/2035		35,000	41,768
New Jersey Economic Development Authority Rev. (School Facilities Construction), 4%, 6/15/2036		30,000	35,703
New Jersey Economic Development Authority Rev. (School Facilities Construction), 4%, 6/15/2037		30,000	35,630
New Jersey Economic Development Authority Rev. (School Facilities Construction), 4%, 6/15/2038		45,000	53,371
New Jersey Economic Development Authority Rev. (School Facilities Construction), 4%, 6/15/2039		35,000	41,410
New Jersey Economic Development Authority Rev. (School Facilities Construction), 4%, 6/15/2040		40,000	47,243
New Jersey Economic Development Authority Rev. (School Facilities Construction), 4%, 6/15/2041		25,000	29,442
New Jersey Economic Development Authority Rev. (School Facilities Construction), “AAA”, 5%, 6/15/2026		265,000	319,148
New Jersey Economic Development Authority Rev. (School Facilities Construction), “LLL”, 5%, 6/15/2039		615,000	770,447
New York Dormitory Authority Rev., State Personal Income Tax, “A”, 3%, 3/15/2042		2,500,000	2,707,934
New York Dormitory Authority Rev., State Personal Income Tax, “A” (Group C), 5%, 2/15/2037		1,000,000	1,208,930
New York Dormitory Authority Rev., State Personal Income Tax, “D”, 5%, 2/15/2040		830,000	854,338

4

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
State & Local Agencies – continued
New York Urban Development Corp., State Personal Income Tax Rev., “C”, 5%, 3/15/2034	$	2,000,000	$2,478,965
New York, NY, City Transitional Finance Authority Building Aid Rev., “S-2A”, 5%, 7/15/2040		2,000,000	2,007,612
New York, NY, Transitional Finance Authority Building Aid Rev., “S-3”, 5%, 7/15/2043		3,000,000	3,757,770
			$15,850,246
Tax - Other – 8.0%
Glen Cove, NY, Local Economic Assistance Corp. (Garvies Point Public Improvement Project), Capital Appreciation, “B”, 0%, 1/01/2045	$	2,000,000	$783,193
Guam Government Ltd. Obligation Rev., “A”, 5%, 12/01/2035		190,000	222,816
Guam Government Ltd. Obligation Rev., “A”, 5%, 12/01/2036		100,000	117,158
Guam Government Ltd. Obligation Rev., “A”, 5%, 12/01/2046		300,000	346,826
Hudson Yards, NY, Infrastructure Corp. Rev., “A”, 5%, 2/15/2042		2,000,000	2,400,271
Hudson Yards, NY, Infrastructure Corp. Rev., “A”, Unrefunded Balance, 5.75%, 2/15/2047		970,000	974,173
New York, NY, City Transitional Finance Authority Rev., “A-3”, 4%, 8/01/2043		3,000,000	3,434,275
New York, NY, City Transitional Finance Authority Rev., “B-1”, 5%, 8/01/2038		1,175,000	1,480,251
New York, NY, City Transitional Finance Authority Rev., “B-1”, 4%, 8/01/2042		2,000,000	2,278,845
New York, NY, City Transitional Finance Authority Rev., “E-1”, 5%, 2/01/2035		2,300,000	2,827,696
New York, NY, City Transitional Finance Authority Rev., “E-1”, 5%, 2/01/2043		2,500,000	3,036,886
Puerto Rico Convention Center District Authority, Hotel Occupancy Tax Rev., “A”, AAC, 5%, 7/01/2031		350,000	359,059
Puerto Rico Infrastructure Financing Authority Special Tax Rev., “C”, AAC, 5.5%, 7/01/2024		425,000	453,832
Puerto Rico Infrastructure Financing Authority Special Tax Rev., “C”, AAC, 5.5%, 7/01/2026		1,215,000	1,319,868
Triborough Bridge & Tunnel Authority Rev., NY, Payroll Mobility Tax (MTA Bridges and Tunnels), ”A-2“, 5%, 5/15/2051		2,500,000	3,260,571
Wisconsin Public Finance Authority Limited Obligation PILOT Rev. (American Dream at Meadowlands Project), 7%, 12/01/2050		165,000	192,854
			$23,488,574
Tobacco – 1.8%
Buckeye, OH, Tobacco Settlement Financing Authority Rev., “A-3”, 6.25%, 6/01/2037 (Prerefunded 6/01/2022)	$	765,000	$807,600
Buckeye, OH, Tobacco Settlement Financing Authority Senior Asset-Backed Refunding, 2020A-2, “1”, 5%, 6/01/2036		180,000	233,126
Buckeye, OH, Tobacco Settlement Financing Authority Senior Asset-Backed Refunding, 2020B-2, “2”, 5%, 6/01/2055		385,000	449,741
Buckeye, OH, Tobacco Settlement Financing Authority Senior Asset-Backed Refunding, 2020B-3, Capital Appreciation, “2”, 0%, 6/01/2057		3,650,000	597,511
New York Counties Tobacco Trust II, 5.625%, 6/01/2035		35,000	35,149
Suffolk, NY, Tobacco Asset Securitization Corp., Tobacco Settlement, “B”, 5%, 6/01/2032		750,000	770,815
Tobacco Settlement Asset Securitization Corp., NY, “A”, 5%, 6/01/2035		1,000,000	1,206,466
Tobacco Settlement Asset Securitization Corp., NY, “A”, 5%, 6/01/2036		1,000,000	1,204,271
			$5,304,679
Toll Roads – 2.9%
Buffalo & Fort Erie, NY, Public Bridge Authority Toll System Rev., 5%, 1/01/2042	$	1,000,000	$1,193,605
Buffalo & Fort Erie, NY, Public Bridge Authority Toll System Rev., 5%, 1/01/2047		1,000,000	1,185,269
New York Thruway Authority General Rev., Junior Indebtedness Obligations, “A”, 5.25%, 1/01/2056		2,000,000	2,366,375
Texas Private Activity Surface Transportation Corp., Senior Lien Rev. (NTE Mobility Partners Segments 3 LLC Segments 3A & 3B Facility), 7%, 12/31/2038		205,000	233,449
Texas Private Activity Surface Transportation Corp., Senior Lien Rev. (NTE Mobility Partners Segments 3 LLC Segments 3A & 3B Facility), 6.75%, 6/30/2043		170,000	192,560
Triborough Bridge & Tunnel Authority Rev., NY, “A”, 5%, 1/01/2028 (Prerefunded 1/01/2022)		1,000,000	1,024,352
Triborough Bridge & Tunnel Authority Rev., NY, “A”, 4%, 11/15/2054		2,000,000	2,370,718
			$8,566,328
Transportation - Special Tax – 6.2%
Commonwealth of Puerto Rico Highway & Transportation Authority Rev., “A”, NPFG, 4.75%, 7/01/2038	$	395,000	$401,753
Commonwealth of Puerto Rico Highway & Transportation Authority Rev., “D”, AGM, 5%, 7/01/2032		275,000	283,243
Commonwealth of Puerto Rico Highway & Transportation Authority Rev., “J”, NPFG, 5%, 7/01/2029		25,000	25,712
Commonwealth of Puerto Rico Highway & Transportation Authority Rev., “L”, AAC, 5.25%, 7/01/2038		1,290,000	1,395,926
Commonwealth of Puerto Rico Highway & Transportation Authority Rev., “N”, AAC, 5.5%, 7/01/2029		1,255,000	1,376,980
Commonwealth of Puerto Rico Highway & Transportation Authority Rev., Unrefunded Balance, “A”, NPFG, 5%, 7/01/2038		40,000	41,139
Metropolitan Transportation Authority Refunding Rev., NY (Climate Bond Certified), “A-2”, AGM, 5%, 11/15/2044		3,000,000	3,713,604
Metropolitan Transportation Authority Refunding Rev., NY (Climate Bond Certified), “C-1”, 4%, 11/15/2037		1,000,000	1,159,533
Metropolitan Transportation Authority Refunding Rev., NY (Climate Bond Certified), “E”, 5%, 11/15/2033		2,000,000	2,607,662

5

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
Transportation - Special Tax – continued
Metropolitan Transportation Authority, NY, Transportation Rev., “A-2”, 0.834%, 11/01/2032 (Put Date 4/01/2026)	$	1,500,000	$1,528,338
New Jersey Transportation Trust Fund Authority, “A”, 4%, 6/15/2038 (w)		85,000	96,979
New Jersey Transportation Trust Fund Authority, “A”, 4%, 6/15/2039 (w)		170,000	193,349
New Jersey Transportation Trust Fund Authority, “A”, 4%, 6/15/2040 (w)		160,000	181,361
New Jersey Transportation Trust Fund Authority, “A”, 4%, 6/15/2041 (w)		140,000	158,290
New Jersey Transportation Trust Fund Authority, “A”, 4%, 6/15/2042 (w)		140,000	157,757
New Jersey Transportation Trust Fund Authority, “AA”, 5%, 6/15/2029 (w)		75,000	91,453
New Jersey Transportation Trust Fund Authority, “AA”, 5%, 6/15/2030 (w)		70,000	86,632
New Jersey Transportation Trust Fund Authority, “AA”, 5%, 6/15/2031 (w)		105,000	131,960
New Jersey Transportation Trust Fund Authority, “AA”, 5%, 6/15/2032 (w)		75,000	95,781
New Jersey Transportation Trust Fund Authority, “AA”, 5%, 6/15/2033 (w)		100,000	126,792
New Jersey Transportation Trust Fund Authority, “AA”, 5%, 6/15/2034 (w)		95,000	119,888
New Jersey Transportation Trust Fund Authority, “AA”, 5%, 6/15/2035 (w)		90,000	113,016
New Jersey Transportation Trust Fund Authority, “AA”, 5%, 6/15/2036 (w)		95,000	118,764
New Jersey Transportation Trust Fund Authority, “AA”, 5%, 6/15/2037 (w)		45,000	56,001
New Jersey Transportation Trust Fund Authority, “AA”, 5%, 6/15/2045		155,000	195,377
New Jersey Transportation Trust Fund Authority, “AA”, 5%, 6/15/2050		105,000	131,699
New Jersey Transportation Trust Fund Authority, Transportation System, “A”, 5%, 12/15/2039		185,000	231,761
New Jersey Transportation Trust Fund Authority, Transportation System, “BB”, 5%, 6/15/2044		185,000	226,880
New York Transportation Development Corp., Exempt Facility Rev. (State Thruway Service Areas Project), 4%, 4/30/2053		2,750,000	3,205,884
			$18,253,514
Universities - Colleges – 14.0%
Albany, NY, Capital Resource Corp. Rev. (Albany College of Pharmacy Project), “A”, 5%, 12/01/2033	$	125,000	$139,300
Build NYC Resource Corp. Rev. (Albert Einstein School of Medicine, Inc.), 5.5%, 9/01/2045 (n)		1,080,000	1,219,056
Build NYC Resource Corp. Rev. (Manhattan College Project), 5%, 8/01/2047		2,000,000	2,349,578
Dobbs Ferry, NY, Local Development Corp. (Mercy College Project), 5%, 7/01/2039		1,000,000	1,113,188
Dutchess County, NY, Local Development Corp. Rev. (Vassar College Project), 5%, 7/01/2042		1,500,000	1,825,436
Hempstead, NY, Local Development Corp. Rev. (Hofstra University Project), 5%, 7/01/2047		2,000,000	2,441,288
Hempstead, NY, Local Development Corp. Rev. (Hofstra University Project), “A”, 3%, 7/01/2051		3,000,000	3,243,105
Hempstead, NY, Local Development Corp. Rev. (Molloy College Project), 5%, 7/01/2036		675,000	802,698
Hempstead, NY, Local Development Corp. Rev. (Molloy College Project), 5%, 7/01/2038		480,000	568,552
Miami-Dade County, FL, Educational Facilities Authority Rev. (University of Miami), “B”, 5.25%, 4/01/2029		1,325,000	1,717,476
Monroe County, NY, Industrial Development Corp. Rev. (University of Rochester Project), “A”, 5%, 7/01/2030		1,000,000	1,169,403
Monroe County, NY, Industrial Development Corp. Rev. (University of Rochester Project), “A”, 5%, 7/01/2037		1,000,000	1,223,326
Monroe County, NY, Industrial Development Corp. Rev. (University of Rochester Project), “A”, 4%, 7/01/2050		2,000,000	2,351,663
New York Dormitory Authority Rev. (Columbia University), “B”, 5%, 10/01/2038		1,000,000	1,262,089
New York Dormitory Authority Rev. (New York University), “A”, 4%, 7/01/2041		1,500,000	1,735,100
New York Dormitory Authority Rev. (St. John's University), “A”, 4%, 7/01/2033		1,000,000	1,237,508
New York Dormitory Authority Rev. (St. John's University), “A”, 4%, 7/01/2034		500,000	616,778
New York Dormitory Authority Rev. (Teachers College), 4%, 7/01/2038 (w)		375,000	435,003
New York Dormitory Authority Rev. (Teachers College), 5%, 7/01/2039 (w)		425,000	533,381
New York Dormitory Authority Rev. (Teachers College), 4%, 7/01/2040 (w)		785,000	905,429
New York Dormitory Authority Rev. (Teachers College), 5%, 7/01/2041 (w)		800,000	997,574
New York Dormitory Authority Rev., Non-State Supported Debt, “A”, 5%, 7/01/2037 (Prerefunded 7/01/2022)		3,000,000	3,145,552
New York Dormitory Authority Rev., Non-State Supported Debt, “A”, 5%, 7/01/2039		2,000,000	2,594,249
Oneida County, NY, Local Development Corp. Rev. (Hamilton College Project), 5%, 7/01/2051		750,000	1,185,463
Puerto Rico Industrial, Tourist, Educational, Medical & Environmental Control Facilities Financing Authority, Higher Education Rev. (Ana G. Mendez University System Project), 5.125%, 4/01/2032		80,000	81,060
Puerto Rico Industrial, Tourist, Educational, Medical & Environmental Control Facilities Financing Authority, Higher Education Rev. (Ana G. Mendez University System Project), 5.375%, 4/01/2042		135,000	137,025
Schenectady County, NY, Capital Resource Corp. Tax-Exempt Rev. (Union College Project), 5%, 1/01/2047		2,000,000	2,397,421
St. Lawrence County, NY, Industrial Development Agency Rev. (Clarkson University), “B”, 5%, 9/01/2038 (w)		100,000	125,674
St. Lawrence County, NY, Industrial Development Agency Rev. (Clarkson University), “B”, 5%, 9/01/2039 (w)		200,000	250,728
St. Lawrence County, NY, Industrial Development Agency Rev. (Clarkson University), “B”, 5%, 9/01/2040 (w)		150,000	187,570
St. Lawrence County, NY, Industrial Development Agency Rev. (Clarkson University), “B”, 5%, 9/01/2041 (w)		100,000	124,724
Tompkins County, NY, Development Corp. Continuing Care Retirement Community Rev. (Ithaca College Project), “A”, 5%, 7/01/2041		1,000,000	1,232,506
Troy, NY, Capital Resource Corp. Rev. (Rensselaer Polytechnic Institute Project), 4%, 9/01/2033		100,000	120,409

6

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
Universities - Colleges – continued
Troy, NY, Capital Resource Corp. Rev. (Rensselaer Polytechnic Institute Project), 4%, 9/01/2035	$	500,000	$600,817
Troy, NY, Industrial Development Authority, Civic Facility Rev. (Rensselaer Polytechnic Institute), “E”, 5%, 9/01/2031		1,000,000	1,007,942
			$41,078,071
Universities - Dormitories – 2.4%
Amherst, NY, Development Corporation, Student Housing Facility Refunding Rev. (UBF Facility/Student Housing Corp./Greiner and Hadley Projects at SUNY Buffalo), “A”, AGM, 5%, 10/01/2045	$	1,000,000	$1,198,949
New York Dormitory Authority Rev. (State University Dormitory Facilities), “A”, 5%, 7/01/2037		3,000,000	3,145,553
Onondaga County, NY, Trust for Cultural Resources Rev. (Abby Lane Housing Corp. Project), 5%, 5/01/2040		1,000,000	1,167,299
Westchester County, NY, Local Development Corp. Rev. (Purchase Housing Corp. II Project), 5%, 6/01/2042		1,250,000	1,429,647
			$6,941,448
Utilities - Cogeneration – 0.2%
Puerto Rico Industrial, Tourist, Educational, Medical & Environmental Control Facilities Financing Authority Rev. (Cogeneration Facilities - AES Puerto Rico Project), 9.12%, 6/01/2022	$	540,000	$553,500
Utilities - Municipal Owned – 1.9%
Guam Power Authority Rev., “A”, AGM, 5%, 10/01/2039	$	155,000	$172,454
Guam Power Authority Rev., “A”, AGM, 5%, 10/01/2044		180,000	199,426
Long Island, NY, Power Authority, Electric System General Rev., 5%, 9/01/2035		1,000,000	1,243,734
Puerto Rico Electric Power Authority Rev., “A”, 5%, 7/01/2029 (a)(d)		675,000	654,750
Puerto Rico Electric Power Authority Rev., “A”, 5%, 7/01/2042 (a)(d)		100,000	97,000
Puerto Rico Electric Power Authority Rev., “AAA”, 5.25%, 7/01/2021 (a)(d)		50,000	48,750
Puerto Rico Electric Power Authority Rev., “AAA”, 5.25%, 7/01/2030 (a)(d)		25,000	24,313
Puerto Rico Electric Power Authority Rev., “CCC”, 5.25%, 7/01/2027 (a)(d)		250,000	243,125
Puerto Rico Electric Power Authority Rev., “DDD”, 5%, 7/01/2020 (a)(d)		25,000	24,219
Puerto Rico Electric Power Authority Rev., “DDD”, 5%, 7/01/2021 (a)(d)		265,000	257,712
Puerto Rico Electric Power Authority Rev., “DDD”, 5%, 7/01/2022 (a)(d)		430,000	417,100
Puerto Rico Electric Power Authority Rev., “EEE”, 6.05%, 7/01/2032 (a)(d)		140,000	133,175
Puerto Rico Electric Power Authority Rev., “RR”, NPFG, 5%, 7/01/2022		885,000	898,731
Puerto Rico Electric Power Authority Rev., “TT”, 5%, 7/01/2021 (a)(d)		115,000	111,837
Puerto Rico Electric Power Authority Rev., “TT”, 5%, 7/01/2023 (a)(d)		110,000	106,700
Puerto Rico Electric Power Authority Rev., “TT”, 5%, 7/01/2027 (a)(d)		20,000	19,400
Puerto Rico Electric Power Authority Rev., “TT”, 5%, 7/01/2037 (a)(d)		345,000	334,650
Puerto Rico Electric Power Authority Rev., “VV”, NPFG, 5.25%, 7/01/2034		30,000	32,310
Puerto Rico Electric Power Authority Rev., “WW”, 5.375%, 7/01/2022 (a)(d)		20,000	19,475
Puerto Rico Electric Power Authority Rev., “WW”, 5.25%, 7/01/2025 (a)(d)		50,000	48,625
Puerto Rico Electric Power Authority Rev., “ZZ”, 5%, 7/01/2018 (a)(d)		170,000	163,200
Puerto Rico Electric Power Authority Rev., “ZZ”, 5.25%, 7/01/2023 (a)(d)		180,000	175,050
Puerto Rico Electric Power Authority Rev., “ZZ”, 5.25%, 7/01/2024 (a)(d)		55,000	53,487
Puerto Rico Electric Power Authority Rev., “ZZ”, 5.25%, 7/01/2026 (a)(d)		170,000	165,325
			$5,644,548
Utilities - Other – 0.6%
Public Authority for Colorado Energy Natural Gas Purchase Rev., 6.5%, 11/15/2038	$	1,085,000	$1,698,170
Water & Sewer Utility Revenue – 6.4%
Guam Waterworks Authority Rev. (Water and Wastewater System), 5%, 7/01/2036	$	215,000	$250,996
Guam Waterworks Authority Rev. (Water and Wastewater System), 5%, 7/01/2037		270,000	314,946
Guam Waterworks Authority Rev. (Water and Wastewater System), 5%, 7/01/2040		750,000	871,999
Guam Waterworks Authority Rev. (Water and Wastewater System), “A”, 5%, 1/01/2050		345,000	423,531
Mississippi Development Bank Special Obligation (Jackson Water and Sewer System Rev. Bond Project), AGM, 6.875%, 12/01/2040		100,000	113,873
New York Environmental Facilities Corp., Clean Water & Drinking Water Rev. (New York City Municipal Water Finance Authority Project), “B”, 5%, 6/15/2043		3,500,000	4,389,931
New York, NY, Municipal Water Finance Authority, Water & Sewer System Rev., 4%, 6/15/2041		3,000,000	3,545,090
New York, NY, Municipal Water Finance Authority, Water & Sewer System Rev., “BB”, 5%, 6/15/2046		1,000,000	1,217,173
New York, NY, Municipal Water Finance Authority, Water & Sewer System Rev., “DD”, 5%, 6/15/2029		1,325,000	1,741,775
New York, NY, Municipal Water Finance Authority, Water & Sewer System Rev., “DD”, 5%, 6/15/2034		2,000,000	2,183,000

7

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
Water & Sewer Utility Revenue – continued
New York, NY, Municipal Water Finance Authority, Water & Sewer System Rev., “DD”, 5%, 6/15/2037	$	3,000,000	$3,786,293
			$18,838,607
Total Municipal Bonds			$293,295,689
Bonds – 0.2%
Consumer Services – 0.2%
Toll Road Investors Partnership II LP, Capital Appreciation, NPFG, 0%, 2/15/2025 (n)	$	415,000	$366,957
Toll Road Investors Partnership II LP, Capital Appreciation, NPFG, 0%, 2/15/2043 (n)		1,000,000	306,549
Total Bonds			$673,506
Investment Companies (h) – 0.7%
Money Market Funds – 0.7%
MFS Institutional Money Market Portfolio, 0.02% (v)		2,080,361	$2,080,361
Other Assets, Less Liabilities – (0.9)%			(2,703,297)
Net Assets – 100.0%			$293,346,259

(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 $2,080,361 and $293,969,195, 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 $12,903,998, representing 4.4% 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.
(w)	When-issued security.

The following abbreviations are used in this report and are defined:
AAC	Ambac Assurance Corp.
AGM	Assured Guaranty Municipal
BAM	Build America Mutual
FGIC	Financial Guaranty Insurance Co.
FHA	Federal Housing Administration
FLR	Floating Rate. Interest rate resets periodically based on the parenthetically disclosed reference rate plus a spread (if any). The period-end rate reported may not be the current rate. All reference rates are USD unless otherwise noted.
FNMA	Federal National Mortgage Assn.
LIBOR	London Interbank Offered Rate
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.

8

Supplemental Information

6/30/21 (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

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. 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, 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 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 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, 2021 in valuing the fund's assets or liabilities:

Financial Instruments	Level 1	Level 2	Level 3	Total
Municipal Bonds	$—	$293,295,689	$—	$293,295,689
U.S. Corporate Bonds	—	673,506	—	673,506
Mutual Funds	2,080,361	—	—	2,080,361
Total	$2,080,361	$293,969,195	$—	$296,049,556

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	$2,328,184	$15,906,399	$16,154,222	$—	$—	$2,080,361

Affiliated Issuers	Dividend Income	Capital Gain Distributions
MFS Institutional Money Market Portfolio	$265	$—

9

Supplemental Information (unaudited) – continued

(3) Jurisdiction Weightings

Jurisdiction weighting percentages based on net assets, as of June 30, 2021, are as follows:

New York	84.3%
Puerto Rico	7.1%
Guam	1.4%
New Jersey	1.4%
Illinois	1.2%
Tennessee	0.9%
Ohio	0.7%
Colorado	0.6%
Florida	0.6%
Michigan	0.6%
Texas	0.6%
Pennsylvania	0.5%
Maryland	0.4%
Alabama	0.3%
Wisconsin	0.3%
Indiana	0.1%
Louisiana (o)	0.0%
Mississippi (o)	0.0%

(o) Less than 0.1%.

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

(4) Impacts of COVID-19

The pandemic related to the global spread of novel coronavirus disease (COVID-19), which was first detected in December 2019, has resulted in significant disruptions to global business activity and the global economy, as well as the economies of individual countries, the financial performance of individual companies and sectors, and the securities and commodities markets in general. Multiple surges in cases globally, the availability and widespread adoption of vaccines, and the emergence of variant strains of the virus continue to create uncertainty as to the future and long-term impacts resulting from the pandemic including impacts to the prices and liquidity of the fund's investments and the fund's performance.

10