MFS INVESTMENT GRADE MUNICIPAL TRUST NCSRS

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

FORM N-CSR

CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES

Investment Company Act file number 811-05785

MFS INVESTMENT GRADE MUNICIPAL TRUST

(Exact name of registrant as specified in charter)

111 Huntington Avenue, Boston, Massachusetts 02199 (Address of principal executive offices) (Zip code)

Christopher R. Bohane

Massachusetts Financial Services Company

111Huntington Avenue Boston, Massachusetts 02199

(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: May 31, 2026

Portfolio Composition

Portfolio structure (i)

Top ten industries (i)

Healthcare Revenue - Hospitals	30.7%
Healthcare Revenue - Long Term Care	23.4%
Universities - Colleges	15.0%
General Obligations - General Purpose	13.6%
Airport Revenue	12.9%
Miscellaneous Revenue - Other	9.5%
Multi-Family Housing Revenue	9.4%
Secondary Schools	9.2%
Universities - Dormitories	8.9%
General Obligations - Schools	6.6%

Composition including fixed income credit quality (a)(i)

AAA	6.5%
AA	36.1%
A	54.5%
BBB	45.1%
BB	9.2%
B	1.1%
CCC	1.7%
CC	0.8%
Not Rated	15.9%
Cash & Cash Equivalents (Less Liabilities) (b)	(70.9)%

Portfolio facts

Average Duration (d)	5.7
Average Effective Maturity (m)	24.2 yrs.

(a)

For all securities other than those specifically described below, ratings are assigned to

underlying securities utilizing ratings from Moody’s, Fitch, and Standard & Poor’s rating

agencies and applying the following hierarchy: If all three agencies provide a rating, the middle rating (after dropping the highest and lowest ratings) is assigned; if two of the three agencies rate a security, the lower of the two is assigned. If none of the 3 rating agencies above assign a rating, but the security is rated by DBRS Morningstar, then the DBRS Morningstar rating is assigned. If none of the 4 rating agencies listed above rate the security, but the security is rated by the Kroll Bond Rating Agency (KBRA), then the KBRA rating is assigned. Ratings are shown in the S&P and Fitch scale (e.g., AAA). Securities rated BBB or

higher are considered investment grade. All ratings are subject to change. Not Rated includes fixed income securities and fixed income derivatives that have not been rated by any rating

Portfolio Composition - continued

agency. The fund may or may not have held all of these instruments on this date. The fund is not rated by these agencies.

(b)

Cash & Cash Equivalents (Less Liabilities) includes any cash, investments in money market

funds, short-term securities, and other assets less liabilities. Liabilities include the value of the

aggregate liquidation preference of the remarketable variable rate munifund term preferred

shares (RVMTP shares) issued by the fund. Cash & Cash Equivalents (Less Liabilities) is negative

due to the aggregate liquidation value of RVMTP shares. Please see the Statement of Assets

and Liabilities for additional information related to the fund’s cash position and other assets

and liabilities. Please see Note 8 in the Notes to Financial Statements for more information on the RVMTP shares issued by the fund.

(d)

Duration is a measure of how much a bond’s price is likely to fluctuate with general changes

in interest rates, e.g., if rates rise 1.00%, a bond with a 5-year duration is likely to lose about

5.00% of its value due to the interest rate move. The Average Duration calculation reflects the

impact of the equivalent exposure of derivative positions, if any. This calculation is based on

net assets applicable to common shares as of May 31, 2026.

(i)

For purposes of this presentation, the components include the value of securities, and reflect

the impact of the equivalent exposure of derivative positions, if any. These amounts may be

negative from time to time. Equivalent exposure is a calculated amount that translates the

derivative position into a reasonable approximation of the amount of the underlying asset that

the portfolio would have to hold at a given point in time to have the same price sensitivity

that results from the portfolio’s ownership of the derivative contract. When dealing with

derivatives, equivalent exposure is a more representative measure of the potential impact of a

position on portfolio performance than value. The bond component will include any accrued

interest amounts.

(m)

In determining each instrument’s effective maturity for purposes of calculating the fund’s

dollar-weighted average effective maturity, MFS uses the instrument’s stated maturity or, if applicable, an earlier date on which MFS believes it is probable that a maturity-shortening feature (such as a put, pre-refunding or prepayment) will cause the instrument to be repaid. Such an earlier date can be substantially shorter than the instrument’s stated maturity. This calculation is based on gross assets, which consists of net assets applicable to common shares plus the value of preferred shares, as of May 31, 2026.

Percentages are based on net assets applicable to common shares as of May 31, 2026.

The portfolio is actively managed and current holdings may be different.

Portfolio Managers' Profiles

Portfolio Manager	Primary Role	Since	Title and Five Year History
Michael Dawson	Portfolio Manager	2007	Investment Officer of MFS; employed in the investment management area of MFS since 1998.
Jason Kosty	Portfolio Manager	2022	Investment Officer of MFS; employed in the investment management area of MFS since 2014.

Other Notes

The fund’s shares may trade at a discount or premium to net asset value. When fund shares trade at a premium, buyers pay more than the net asset value of the underlying fund shares, and shares purchased at a premium would receive less than the amount paid for them in the event of the fund’s concurrent liquidation.

The fund’s monthly distributions may include a return of capital to shareholders to the extent that distributions are in excess of the fund’s net investment income and net capital gains, determined in accordance with federal income tax regulations. Distributions that are treated for federal income tax purposes as a return of capital will reduce each shareholder’s basis in his or her shares and, to the extent the return of capital exceeds such basis, will be treated as gain to the shareholder from a sale of shares. Returns of shareholder capital may have the effect of reducing the fund’s assets and increasing the fund’s expense ratio.

In accordance with Section 23(c) of the Investment Company Act of 1940, the fund hereby gives notice that it may from time to time repurchase shares of the fund in the open market at the option of the Board of Trustees and on such terms as the Trustees shall determine.

Portfolio of Investments

5/31/26 (unaudited)

The Portfolio of Investments is a complete list of all securities owned by your fund. It is categorized by jurisdiction.

Issuer		Shares/Par	Value ($)
Municipal Bonds – 167.2%
Alabama – 1.1%
Black Belt Energy Gas District, AL, Gas Project Rev., “A”, 5.25%, 5/01/2056 (Put Date 5/01/2032)	$	265,000	$269,187
Jacksonville, AL, Public Educational Building Authority, Higher Education Facilities Rev. (Jacksonville State University Foundation), “A”, AGM, 5.5%, 8/01/2058		115,000	118,823
			$388,010
Alaska – 0.8%
Alaska Municipal Bond Bank Authority, General Obligation Refunding, “2”, 5.5%, 12/01/2050	$	125,000	$130,558
Alaska Railroad Corp., Cruise Port Rev., AGM, 5.5%, 10/01/2054		125,000	130,082
			$260,640
Arizona – 6.4%
Arizona Industrial Development Authority, Education Rev. (Academies of Math & Science Projects), 5%, 7/01/2038	$	300,000	$302,810
Arizona Industrial Development Authority, Education Rev. (Benjamin Franklin Charter School Projects), “A”, 5%, 7/01/2043		110,000	107,778
Arizona Industrial Development Authority, Student Housing Rev. (Provident Group - NCCU Properties LLC - North Carolina Central University Project), “A”, BAM, 5%, 6/01/2049		375,000	380,899
Maricopa County, AZ, Higley Unified School District No. 60, Certificates of Participation, AGM, 5%, 6/01/2053		640,000	650,591
Phoenix, AZ, Industrial Development Authority, Education Facility Rev. (Great Hearts Academies Projects), “A”, 5%, 7/01/2046		80,000	79,994
Phoenix, AZ, Industrial Development Authority, Education Facility Rev. (Legacy Traditional Schools Projects), 5%, 7/01/2045 (n)		80,000	77,660
Phoenix, AZ, Industrial Development Authority, Hotel Rev. (Provident Group - Falcon Properties LLC Project), “A”, 4%, 12/01/2051 (n)		300,000	177,979
Phoenix, AZ, Industrial Development Authority, Hotel Rev. (Provident Group - Falcon Properties LLC Project), “B”, 5.75%, 12/15/2057 (n)		100,000	68,696
Pima County, AZ, Industrial Development Authority, Education Facility Rev. (American Leadership Academy Project), 4%, 6/15/2051 (n)		120,000	91,311
Pima County, AZ, Industrial Development Authority, Senior Living Rev. (La Posada at Pusch Ridge Project), “A”, 7%, 11/15/2057 (n)		140,000	148,796
Sierra Vista, AZ, Industrial Development Authority, Education Facility Rev. (American Leadership Academy Project), 5.75%, 6/15/2058		150,000	144,072
			$2,230,586

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
California – 3.2%
California Housing Finance Agency Municipal Certificates, “X”, 0.799%, 11/20/2035 (i)	$	1,696,826	$65,115
California Municipal Finance Authority, COP (Palomar Health), “A”, AGM, 5.25%, 11/01/2052		95,000	95,675
California Municipal Special Finance Agency, Essential Housing Rev. (Solana at Grand), “A-1”, 4%, 8/01/2056 (n)		100,000	86,379
California School Finance Authority, Charter School Rev. (Aspire Public Schools - Obligated Group - Issue No. 6), “A”, 5%, 8/01/2052 (n)		235,000	217,614
California School Finance Authority, School Facility Rev. (Alliance for College - Ready Public Schools Projects), “A”, 5%, 7/01/2045 (n)		100,000	100,006
California Statewide Communities Development Authority Rev. (Enloe Medical Center), “A”, AGM, 5.375%, 8/15/2057		130,000	132,503
California Statewide Communities Development Authority, College Housing Rev. (NCCD - Hooper Street LLC College of the Arts Project), 5.25%, 7/01/2049 (z)		100,000	100,254
Mount San Antonio, CA, Community College District Rev. (Election of 2008), “A”, 5.875%, 8/01/2028		140,000	147,191
University of California, Hastings Campus Housing Finance Authority, Campus Housing Rev., Convertible Capital Appreciation, “B”, 0% to 7/01/2035, 6.75% to 7/01/2061 (n)		330,000	163,498
			$1,108,235
Colorado – 8.6%
Adams & Arapahoe Counties, CO, Joint School District No. 28J, Certificates of Participation, BAM, 5.5%, 12/01/2054	$	145,000	$154,366
Aurora, CO, Science & Technology Park Metropolitan District No. 1, Special Rev., “A”, AGM, 5%, 12/01/2054		80,000	80,409
Aurora, CO, Science & Technology Park Metropolitan District No. 1, Special Rev., “B”, AGM, 4.75%, 12/15/2054		185,000	183,308
Broomfield, CO, Midcities Metropolitan District No. 2, Special Rev., AGM, 4%, 12/01/2046		349,000	328,705
Colorado Educational & Cultural Facilities Authority Rev. (Twin Peaks Charter Academy Project), 5%, 11/15/2031		145,000	145,657
Colorado Health Facilities Authority Rev. (CommonSpirit Health), “A”, 5.25%, 11/01/2052		365,000	376,326
Colorado Health Facilities Authority Rev. (CommonSpirit Health), “A-2”, 4%, 8/01/2049		80,000	70,277
Colorado Health Facilities Authority Rev. (Covenant Living Communities & Services), “A”, 5.125%, 12/01/2055		115,000	113,487
Denver, CO, City & County Airport System Rev., “A”, 4.125%, 11/15/2047		80,000	74,067

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
Colorado – continued
Denver, CO, City & County Airport System Rev., “A”, 4.125%, 11/15/2053	$	80,000	$71,782
Denver, CO, City & County Housing Authority, Multi-Family Housing Rev. (4965 Washington Street Project), “A”, 5%, 12/01/2045		15,000	15,399
Denver, CO, Convention Center Hotel Authority Rev., 5%, 12/01/2040		120,000	120,241
Denver, CO, Health & Hospital Authority Rev., “A”, 4%, 12/01/2040		425,000	393,859
Denver, CO, Health & Hospital Authority Rev., “A”, 5.25%, 12/01/2045		95,000	95,033
Denver, CO, Health & Hospital Authority Rev., “A”, 6%, 12/01/2055		120,000	127,764
Gunnison County, CO, Housing Authority, General Rev. (Whetstone Housing Project), BAM, 5.25%, 6/01/2059		105,000	108,563
Loveland, CO, Lakes at Centerra Metropolitan District No. 2, General Obligation., “A”, AGM, 5%, 12/01/2049		500,000	507,866
			$2,967,109
Connecticut – 2.0%
Connecticut Health & Educational Facilities Authority Rev. (Masonicare), “F”, 5%, 7/01/2037	$	675,000	$675,272
District of Columbia – 1.1%
District of Columbia Refunding Rev. (Catholic University of America), “A”, 5.75%, 10/01/2055	$	100,000	$105,697
Metropolitan Washington, D.C., Airports Authority System Refunding Rev., “A”, 4.5%, 10/01/2053		290,000	276,717
			$382,414
Florida – 17.5%
Florida Development Finance Corp. Rev. (Brightline Florida Passenger Rail Project), AGM, 5.25%, 7/01/2053	$	500,000	$495,665
Florida Development Finance Corp., Educational Facilities Rev. (Drs. Kiran & Pallavi Patel 2017 Foundation for Global Understanding, Inc. Project), “A”, 4%, 7/01/2051 (n)		100,000	83,562
Florida Development Finance Corp., Senior Living Rev. (Mayflower Retirement Community Project), “A”, 4%, 6/01/2055 (n)		165,000	122,804
Florida Higher Educational Facilities Financing Authority Rev. (Jacksonville University Project), “A”, 5%, 6/01/2048 (n)		100,000	92,538
Florida Pompano Beach Rev. (John Knox Village Project), “A”, 4%, 9/01/2056		170,000	137,636
Greater Orlando, FL, Aviation Authority, Airport Facilities Rev., 5.25%, 10/01/2048		475,000	497,638
Hillsborough County, FL, Industrial Development Authority, Hospital Rev. (Tampa General Hospital Project), “A”, 4%, 8/01/2050		1,000,000	881,502
Lee County, FL, Airport Rev., 5.5%, 10/01/2056		110,000	115,022

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
Florida – continued
Lee County, FL, Industrial Development Authority, Healthcare Facilities Rev. (Shell Point Obligated Group), 5%, 11/15/2044	$	100,000	$101,429
Lee County, FL, Industrial Development Authority, Healthcare Facilities Rev. (Shell Point Obligated Group), 5%, 11/15/2049		160,000	158,682
Lee County, FL, Industrial Development Authority, Healthcare Facilities Rev. (Shell Point Obligated Group), “C”, 5%, 11/15/2054		295,000	287,854
Miami Beach, FL, Health Facilities Authority, Hospital Rev. (Mount Sinai Medical Center of Florida), “B”, 4%, 11/15/2051		440,000	385,320
Miami-Dade County, FL, Aviation Rev., “A”, 5.5%, 10/01/2055		260,000	273,173
Orange County, FL, Health Facilities Authority Rev. (Presbyterian Retirement Communities Obligated Group Project), “A”, 4%, 8/01/2047		580,000	508,644
Orange County, FL, Health Facilities Authority, Hospital Rev. (Orlando Health Obligated Group), “A”, 5.25%, 10/01/2056		240,000	249,456
Osceola County, FL, Transportation Improvement & Refunding Rev. (Osceola Parkway), Capital Appreciation, “A-2”, 0%, 10/01/2042		175,000	81,323
Palm Beach County, FL, Educational Facilities Authority Rev. (Palm Beach Atlantic University, Inc.), 5.25%, 10/01/2053		120,000	117,580
Palm Beach County, FL, Health Facilities Authority Rev. (Acts Retirement-Life Communities, Inc. Obligated Group), 5%, 11/15/2055		215,000	213,789
Palm Beach County, FL, Health Facilities Authority Rev. (Toby & Leon Cooperman Sinai Residences of Boca Raton), 4.25%, 6/01/2056		130,000	106,841
Pasco County, FL, Capital Improvement Cigarette Tax Allocation, “A”, AGM, 5.75%, 9/01/2054		390,000	418,106
Pasco County, FL, Del Webb Bexley Community Development District, Special Assessment Rev., 5.4%, 5/01/2049		100,000	101,091
Pasco County, FL, Solid Waste Disposal & Resource Recovery System Rev., “A”, 5.25%, 10/01/2056		200,000	206,300
South Miami, FL, Health Facilities Authority, Hospital Refunding Rev. (Baptist Health South Florida Obligated Group), 4%, 8/15/2047		355,000	321,066
Venice, FL, Retirement Community Improvement Rev. (Village on the Isle Project), “A”, 5.625%, 1/01/2060		100,000	100,336
			$6,057,357
Georgia – 4.2%
Atlanta, GA, Geo. L. Smith II World Congress Center Authority, Convention Center Hotel Rev., “B”, 5%, 1/01/2054 (n)	$	100,000	$96,420
Georgia Municipal Electric Authority (Plant Vogtle Units 3 & 4 Project J), “A”, AGM, 5%, 7/01/2064		245,000	248,737
Georgia Municipal Electric Authority (Plant Vogtle Units 3 & 4 Project P), “A”, 5.5%, 7/01/2064		130,000	133,404
Georgia Ports Authority Rev., 4%, 7/01/2052		145,000	135,936

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
Georgia – continued
Georgia Private Colleges & Universities Authority Rev. (Mercer University Project), 5.25%, 10/01/2051	$	560,000	$578,909
Savannah, GA, Convention Center Authority Rev. (Convention Center Hotel First Tier), “A”, 5.25%, 6/01/2061		100,000	99,395
Savannah, GA, Convention Center Authority Rev. (Convention Center Hotel Second Tier), “B”, 6.25%, 6/01/2061		165,000	167,973
			$1,460,774
Hawaii – 0.4%
Hawaii Airports System Rev., “A”, 5.5%, 7/01/2054	$	135,000	$143,596
Illinois – 13.3%
Bridgeview, IL, Stadium & Redevelopment Projects, Taxable, AAC, 5.14%, 12/01/2036	$	360,000	$335,635
Chicago, IL, Board of Education, Dedicated Capital Improvement, 5%, 4/01/2045		85,000	84,755
Chicago, IL, Board of Education, Dedicated Capital Improvement, 5%, 4/01/2046		100,000	98,222
Chicago, IL, Board of Education, Dedicated Capital Improvement, 6%, 4/01/2046		555,000	561,769
Chicago, IL, Board of Education, Dedicated Capital Improvement, 5.75%, 4/01/2048		175,000	183,021
Chicago, IL, Board of Education, Unlimited Tax General Obligation Refunding Dedicated Rev., “A”, 5%, 12/01/2042		100,000	98,122
Chicago, IL, Board of Education, Unlimited Tax General Obligation Refunding Dedicated Rev., “B”, 4%, 12/01/2039		100,000	91,074
Chicago, IL, Board of Education, Unlimited Tax General Obligation Refunding Dedicated Rev., “B”, 4%, 12/01/2041		230,000	205,790
Chicago, IL, Board of Education, Unlimited Tax General Obligation Refunding Dedicated Rev., “H”, 5%, 12/01/2046		180,000	170,106
Chicago, IL, General Obligation, “A”, BAM, 6%, 1/01/2046		405,000	442,476
Chicago, IL, Metropolitan Pier & Exposition Authority Refunding Rev. (McCormick Place Expansion Project), Capital Appreciation, “A”, AGM, 0%, 12/15/2056		220,000	49,944
Chicago, IL, O'Hare International Airport Rev., Senior Lien, “A”, 5%, 1/01/2048		140,000	140,379
Chicago, IL, O'Hare International Airport Rev., Senior Lien, “A”, 5%, 1/01/2053		75,000	75,047
Illinois Finance Authority Rev. (Lake Forest College), “A”, 5.25%, 10/01/2052		280,000	272,648
Illinois Finance Authority Rev. (Moorings of Arlington Heights), “A”, 5.375%, 11/01/2055		100,000	98,813
Illinois Finance Authority Rev. (Plymouth Place, Inc.), “A”, 6.75%, 5/15/2058		250,000	262,157

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
Illinois – continued
Illinois Finance Authority, Health Services Facility Lease Rev. (Provident Group - UIC Surgery Center LLC - University of Illinois Health Services Facility Project), 4%, 10/01/2050	$	230,000	$196,479
Illinois Housing Development Authority Rev., “A”, GNMA, 4.9%, 4/01/2047		435,000	441,757
Lincolnshire, IL, Special Service Area No. 1 (Sedgebrook Project), 6.25%, 3/01/2034		100,000	100,163
St. Clair County, IL, Cahokia Community Unit School District No. 187, General Obligation, “B”, AGM, 5%, 1/01/2044		175,000	182,828
State of Illinois, General Obligation, 5.75%, 5/01/2045		475,000	500,641
			$4,591,826
Indiana – 3.9%
Fishers, IN, Town Hall Building Corp., Lease Rental Rev., “A”, BAM, 5.75%, 1/15/2063	$	350,000	$378,162
Indiana Finance Authority, Educational Facilities Rev. (Rose-Hulman Institute of Technology Project), 5.75%, 6/01/2053		145,000	154,123
Indiana Finance Authority, Hospital Rev. (Reid Health), AGM, 5%, 1/01/2052		495,000	498,603
Indiana Finance Authority, Student Housing Rev. (CHF - Tippecanoe LLC - Student Housing Project), “A”, 5.375%, 6/01/2064		120,000	120,042
Indianapolis, IN, Local Public Improvement Bond Bank Rev. (Convention Center Hotel), “F-1”, BAM, 5.25%, 3/01/2067		180,000	186,068
			$1,336,998
Iowa – 0.4%
Iowa Student Loan Liquidity Corp. Rev., “C”, 3.5%, 12/01/2044	$	170,000	$136,320
Louisiana – 2.9%
Louisiana Public Facilities Authority Rev. (I-10 Calcasieu River Bridge Public-Private Partnership Project), 5.75%, 9/01/2064	$	120,000	$124,141
Louisiana Public Facilities Authority Rev. (Loyola University Project), 5.25%, 10/01/2046		450,000	454,728
Louisiana Public Facilities Authority Rev. (Provident Group - HSC Properties, Inc., LSU Health Foundation, New Orleans Project), “A-1”, 5.1%, 1/01/2057 (n)		445,000	334,461
Port of New Orleans, LA, Board of Commissioners, Port Facility Rev., “B”, AGM, 5.5%, 4/01/2054		100,000	104,299
			$1,017,629

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
Maine – 2.1%
Maine Finance Authority, Student Loan Rev. (Supplemental Education Loan Program), “A”, AGM, 5%, 12/01/2045	$	365,000	$366,175
Maine Health & Higher Educational Facilities Authority Rev., “A”, AGM, 4.375%, 7/01/2053		375,000	358,615
			$724,790
Maryland – 0.3%
Maryland Health & Higher Educational Facilities Authority Rev. (Kennedy Krieger Institute, Inc.), “A”, 5.5%, 7/01/2056	$	115,000	$120,274
Massachusetts – 2.6%
Massachusetts Development Finance Agency Rev. (Boston Medical Center), “G”, 4.375%, 7/01/2052	$	145,000	$126,947
Massachusetts Development Finance Agency Rev. (Middlesex Sustainable Energy Partners), 6%, 10/01/2049		100,000	108,570
Massachusetts Development Finance Agency Rev. (Tufts University Student Housing Project - PRG Medford Properties, Inc.), 5.25%, 6/01/2065		100,000	102,472
Massachusetts Development Finance Agency Rev. (UMass Memorial Health Care Obligated Group), “K”, 5%, 7/01/2038		80,000	80,447
Massachusetts Educational Financing Authority, Education Loan Rev., “C”, 3%, 7/01/2051		80,000	53,785
Massachusetts Educational Financing Authority, Education Loan Rev., “C”, 4.125%, 7/01/2052		250,000	205,703
Massachusetts Educational Financing Authority, Education Loan Rev., “D”, 5%, 7/01/2054		130,000	123,814
Tisbury, MA, General Obligation, Municipal Purpose Loan, Unlimited Tax, 3%, 8/15/2047		145,000	114,500
			$916,238
Michigan – 9.1%
Board of Regents of Eastern Michigan University, General Rev., “A”, 4%, 3/01/2047	$	240,000	$211,330
Grand Rapids, MI, Economic Development Corp. Rev. (Beacon Hill at Eastgate Project), “A”, 6.125%, 11/01/2060		185,000	185,783
Michigan Finance Authority, Hospital Rev. (Henry Ford Health System), 3.25%, 11/15/2042		570,000	492,899
Michigan Housing Development Authority, Rental Housing Rev., “A”, 4.75%, 10/01/2059		455,000	453,050
Michigan Technological University Board of Trustees, General Rev., “A”, AGM, 5.25%, 10/01/2052		1,675,000	1,716,749
Wayne County, MI, Airport Authority Rev. (Detroit Metropolitan Wayne County Airport), “B”, 5.75%, 12/01/2050		100,000	108,377
			$3,168,188

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
Minnesota – 0.2%
Duluth, MN, Economic Development Authority, Health Care Facilities Rev. (Essentia Health), “A”, 4.25%, 2/15/2048	$	85,000	$76,875
Mississippi – 4.7%
Mississippi Development Bank Special Obligation (Jackson Water and Sewer System Rev. Bond Project), AGM, 6.875%, 12/01/2040	$	90,000	$91,473
Mississippi Home Corp., Single Family Mortgage Rev., “C”, GNMA, 4.65%, 12/01/2048		1,000,000	1,003,587
University of Mississippi Medical Center, Educational Building Corp. Rev. (Colony Park Teaching Campus), “A”, 4%, 6/01/2053		580,000	528,982
			$1,624,042
Nebraska – 1.5%
Omaha, NE, Airport Authority, Airport Facilities Rev., AGM, 5.25%, 12/15/2049	$	500,000	$521,766
New Hampshire – 2.1%
National Finance Authority, NH, Municipal Certificates, “A-2”, 4.088%, 11/20/2042	$	164,679	$153,884
New Hampshire National Finance Authority Rev. (Abilene Christian University Energy Projects), “A”, 5.25%, 11/01/2054		195,000	197,556
New Hampshire National Finance Authority, Lease Rent Rev. (Centurion Foundation West Main Street LLC), “A”, 5%, 5/15/2034		370,000	374,280
			$725,720
New Jersey – 1.9%
Camden County, NJ, Improvement Authority, School Rev. (KIPP Cooper Norcross Academy), 6%, 6/15/2062	$	95,000	$97,576
New Jersey Economic Development Authority Rev. (Goethals Bridge Replacement Project), 5.375%, 1/01/2043		225,000	225,249
New Jersey Housing & Mortgage Finance Agency, Multi-Family Conduit Rev. (Riverview Towers Apartments), “B”, GNMA, 5.25%, 12/20/2065		305,021	328,388
			$651,213
New York – 10.2%
Build NYC Resource Corp. Rev. (Grand Concourse Academy Charter School Project), “B”, 5%, 7/01/2062	$	75,000	$69,595
Build NYC Resource Corp. Rev. (KIPP NYC Public Schools Facilities - Canal West Project), 5.25%, 7/01/2052		1,000,000	1,010,936
Build NYC Resource Corp. Rev. (Urban Resource Institute Project), “A”, 5.5%, 12/01/2051		100,000	105,566
Build NYC Resource Corp., Senior Airport Facilities Rev. (TRIPS Obligated Group), 5.5%, 7/01/2055		250,000	257,304

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
New York – continued
Genesse County, NY, Funding Corp. Rev. (Rochester Regional Health Project), “A”, 5.25%, 12/01/2052	$	280,000	$283,257
New York Dormitory Authority Rev. (White Plains Hospital Obligated Group), AGM, 5.5%, 10/01/2054		105,000	111,238
New York Dormitory Authority Rev., State Personal Income Tax, “A”, 4%, 3/15/2048		220,000	202,267
New York Transportation Development Corp., Special Facilities Rev. (JFK Airport Terminal 6 Redevelopment Project), “A”, 5.5%, 12/31/2060		245,000	248,704
New York Transportation Development Corp., Special Facilities Rev. (JFK Airport Terminal 6 Redevelopment Project), “A”, AGM, 5.25%, 12/31/2054		490,000	502,194
New York Transportation Development Corp., Special Facilities Rev. (John F. Kennedy International Airport New Terminal One Project/Green Bonds), 6%, 6/30/2054		465,000	484,540
Syracuse, NY, Industrial Development Agency PILOT Rev. (Carousel Center Project), “A”, 5%, 1/01/2031		110,000	95,611
Syracuse, NY, Industrial Development Agency PILOT Rev. (Carousel Center Project), “A”, 5%, 1/01/2035		215,000	170,680
			$3,541,892
North Carolina – 1.0%
North Carolina Medical Care Commission, Health Care Facilities First Mortgage Rev. (Lutheran Services for the Aging), “A”, 4%, 3/01/2051	$	130,000	$109,208
North Carolina Medical Care Commission, Retirement Facilities First Mortgage Rev. (Deerfield Episcopal Retirement Community Project), 5.25%, 11/01/2050		100,000	101,716
North Carolina Medical Care Commission, Retirement Facilities First Mortgage Rev. (Deerfield Episcopal Retirement Community Project), 5.25%, 11/01/2056		150,000	150,984
			$361,908
Ohio – 7.0%
Cuyahoga County, OH, Hospital Rev. (MetroHealth System), 4.75%, 2/15/2047	$	220,000	$206,900
Cuyahoga County, OH, Hospital Rev. (MetroHealth System), 5.5%, 2/15/2052		580,000	580,274
Cuyahoga County, OH, Metropolitan Housing Authority, General Rev. (2045 Initiative Project), 2%, 12/01/2031		75,000	66,800
Greene County, OH, Port Authority Economic Development, Facilities Refunding & Improvement Rev. (Community First Solutions Obligated Group), “B”, 5%, 5/15/2059		160,000	154,135
Hamilton County, OH, Healthcare Improvement & Refunding Rev. (Life Enriching Communities Project), 5.5%, 1/01/2055		100,000	101,775

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
Ohio – continued
Ohio Higher Educational Facility Commission Rev. (Cleveland Institute of Music 2022 Project), 5.125%, 12/01/2042	$	70,000	$70,655
Ohio Higher Educational Facility Commission Rev. (Xavier University Project), 5.25%, 5/01/2054		105,000	101,417
Ohio Housing Finance Agency, Multi-Family Tax Exempt Mortgage-Backed (Macarthur Park Apartments Project), “A”, FNMA, 4.5%, 5/01/2039		312,749	327,487
Ohio Housing Finance Agency, Residential Mortgage Rev. (Mortgage-Backed Securities Program), “A”, 4.9%, 9/01/2053		305,000	305,586
Warren County, OH, Healthcare Facilities Rev. (Otterbein Homes Obligated Group), 5%, 7/01/2054		500,000	494,023
			$2,409,052
Oklahoma – 4.9%
Norman, OK, Regional Hospital Authority Rev., 4%, 9/01/2045	$	85,000	$57,492
Norman, OK, Regional Hospital Authority Rev., 5%, 9/01/2045		45,000	34,937
Oklahoma Development Finance Authority, Health System Rev. (OU Medicine Project), “A”, 5.5%, 8/15/2041		185,000	189,740
Oklahoma Development Finance Authority, Health System Rev. (OU Medicine Project), “A”, 5.5%, 8/15/2044		185,000	189,579
Oklahoma Development Finance Authority, Health System Rev. (OU Medicine Project), “B”, 5.5%, 8/15/2057		165,000	165,295
Tulsa County, OK, Industrial Authority, Senior Living Community Refunding Rev. (Montereau, Inc. Project), “A”, 5.25%, 11/15/2045		1,050,000	1,054,123
			$1,691,166
Oregon – 0.8%
Union County, OR, Hospital Facility Authority Rev. (Grande Ronde Hospital Project), 5%, 7/01/2052	$	160,000	$153,311
Yamhill County, OR, Hospital Authority Rev. (Friendsview Retirement), “A”, 5%, 11/15/2056		155,000	131,633
			$284,944
Pennsylvania – 9.4%
Allegheny County, PA, Airport Authority Rev. (Pittsburgh International Airport), “A”, AGM, 5.5%, 1/01/2055	$	385,000	$403,886
Allegheny County, PA, Hospital Development Authority Rev. (Allegheny Health Network Obligated Group), “A”, 4%, 4/01/2044		555,000	515,105
Berks County, PA, Municipal Authority Rev. (Tower Health Project), “A-2”, 6%, 6/30/2034		106,000	112,374
Berks County, PA, Municipal Authority Rev. (Tower Health Project), “A-3”, 5%, 6/30/2039		508,000	475,277

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
Pennsylvania – continued
Berks County, PA, Municipal Authority Rev. (Tower Health Project), Convertible Capital Appreciation, “B-1”, 0% to 11/15/2029, 6% to 6/30/2044	$	254,000	$190,741
Cumberland County, PA, Municipal Authority Rev. (Messiah Village Project), “A”, 5.5%, 6/01/2056		110,000	111,312
Doylestown, PA, Hospital Authority Rev., 5.375%, 7/01/2039		100,000	109,111
Montgomery County, PA, Higher Education & Health Authority Rev. (Thomas Jefferson University), “B”, AGM, 3.125%, 5/01/2053		75,000	51,746
Montgomery County, PA, Industrial Development Authority Rev. (Whitemarsh Continuing Care Retirement Community Project), 5.375%, 1/01/2050		205,000	202,280
Pennsylvania Economic Development Financing Authority Rev. (Presbyterian Senior Living Project), “B-1”, 5.25%, 7/01/2049		105,000	106,224
Pennsylvania Economic Development Financing Authority, Guaranteed Parking Rev. (Capitol Region Parking System), Capital Appreciation, “B-2”, 0%, 1/01/2044		375,000	161,048
Pennsylvania Economic Development Financing Authority, Guaranteed Parking Rev. (Capitol Region Parking System), Capital Appreciation, “B-3”, 0%, 1/01/2049		175,000	37,302
Pennsylvania Economic Development Financing Authority, Private Activity Rev. (PennDOT Major Bridges Package One Project), 5.25%, 6/30/2053		350,000	353,855
Pennsylvania Higher Educational Assistance Agency, Education Loan Rev., “1C”, 5%, 6/01/2051		78,000	74,572
Pennsylvania Higher Educational Assistance Agency, Education Loan Rev., “1C”, 5.5%, 6/01/2052		102,000	102,624
Pennsylvania Higher Educational Assistance Agency, Education Loan Rev., “A”, 4.5%, 6/01/2043		130,000	130,323
Pennsylvania Housing Finance Agency, Single Family Mortgage Rev., “141A”, 5.75%, 10/01/2053		9,483	10,040
Philadelphia, PA, Authority for Industrial Development, Charter School Rev. (Green Woods Charter School Project), “A”, 5.375%, 6/15/2057		100,000	97,423
			$3,245,243
Puerto Rico – 1.2%
Puerto Rico Electric Power Authority Rev., “NN”, NPFG, 4.75%, 7/01/2033	$	40,000	$39,865
Puerto Rico Electric Power Authority Rev., “VV”, NPFG, 5.25%, 7/01/2029		175,000	176,977
Puerto Rico Electric Power Authority Rev., “VV”, NPFG, 5.25%, 7/01/2030		205,000	207,744

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
Puerto Rico – continued
Puerto Rico Sales Tax Financing Corp., Restructured Sales Tax Rev., “A-2”, 4.536%, 7/01/2053	$	1,000	$931
			$425,517
Rhode Island – 0.9%
Rhode Island Student Loan Authority, Education Loan Rev., “A”, 4.125%, 12/01/2042	$	330,000	$325,703
South Carolina – 1.5%
South Carolina Jobs & Economic Development Authority Rev. (Bishop Gadsden Episcopal Retirement Community Obligated Group), “A”, 5%, 4/01/2044	$	130,000	$131,441
South Carolina Jobs-Economic Development Authority Rev. (Bishop Gadsden Episcopal Retirement Community Obligated Group), 5.375%, 4/01/2056		100,000	102,082
South Carolina Jobs-Economic Development Authority, Hospital Rev. (Prisma Health Obligated Group), “A”, 5%, 5/01/2048		270,000	271,958
			$505,481
Tennessee – 2.5%
Knox County, TN, Health Educational & Housing Facility, Board Student Housing Rev. (Provident Group - UTK Properties LLC - University of Tennessee Project), “B-1”, BAM, 5.25%, 7/01/2064	$	185,000	$190,199
Knox County, TN, Health, Educational & Housing Facility, Board Student Housing Rev. (Provident Group - UTK Properties LLC - University of Tennessee Project), “A-1”, BAM, 5.5%, 7/01/2059		80,000	83,438
Metropolitan Nashville, TN, Airport Authority Improvement Rev., “B”, 5.5%, 7/01/2052		150,000	155,964
Metropolitan Nashville, TN, Airport Authority Improvement Rev., “B”, 5.5%, 7/01/2056		100,000	105,010
Nashville and Davidson County, TN, Health & Education Facilities, Board of Metropolitan Government, Multi-Family Tax-Exempt Mortgage-Backed (Ben Allen Ridge Apartments Project), “A”, 4.75%, 2/01/2048		234,178	234,487
Rutherford County, Tennessee, Health & Educational Facilities Board, Student Housing Rev. (Madrone - MTSU Student Housing I, LLC Project), “A-1”, BAM, 5%, 7/01/2065		100,000	97,830
			$866,928

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
Texas – 18.4%
Arlington, TX, Higher Education Finance Corp. Refunding Rev. (Basis Texas Charter Schools, Inc.), 5.875%, 6/15/2065	$	100,000	$101,174
Arlington, TX, Higher Education Finance Corp., Education Rev. (Trinity Basin Preparatory, Inc.), Texas PSF, 4.25%, 8/15/2047		250,000	238,254
Dallas, TX, Senior Lien Special Tax Rev. (Fair Park Venue Project), 6.25%, 8/15/2053 (Put Date 8/15/2028)		155,000	155,188
Denton County, TX, Northlake Municipal Management District No. 2, AGM, 4.5%, 3/01/2044		1,125,000	1,128,497
Galveston County, TX, Municipal Utility District No. 56, Unlimited Tax, AGM, 4.5%, 6/01/2047		500,000	492,646
Harris County, TX, Cultural Education Facilities Finance Corp., Hospital Rev. (Memorial Hermann Health System), “A”, 4.125%, 7/01/2052		230,000	204,604
Harris County, TX, Houston Sports Authority Rev., Capital Appreciation, “A”, AGM, 0%, 11/15/2046		210,000	78,006
Houston, TX, Airport System Refunding Rev., “A”, AGM, 5.25%, 7/01/2053		180,000	185,546
Houston, TX, Higher Education Finance Corp., University Rev. (Houston Christian University Project), 5.25%, 10/01/2054		110,000	107,428
Jarrell, TX, Independent School District, Unlimited Tax Building, Texas PSF, 5.25%, 2/15/2055		500,000	524,895
Kaufman County, TX, Fresh Water Supply District No. 4A, Unlimited Tax Utility, BAM, 4.5%, 9/01/2045		1,000,000	1,001,261
Memorial City, TX, Redevelopment Authority, Tax Increment Contract Rev., AGM, 5%, 9/01/2049		375,000	382,808
New Hope, TX, Cultural Education Facilities Finance Corp., Retirement Facility Rev. (Westminster Project), 5%, 11/01/2060		100,000	97,049
Red River, TX, Education Finance Corp., Higher Education Rev. (Houston Baptist University Project), 5.5%, 10/01/2046		160,000	160,166
Tarrant County, TX, Cultural Education Facilities Finance Corp., Retirement Facility Rev. (Stayton Museum Way), 5.75%, 12/01/2054		389,506	339,456
Texas Transportation Commission, State Highway 249 System Rev., “A”, 5%, 8/01/2057		165,000	165,038
Texas Water Development Board, Water Implementation Rev., 5%, 10/15/2057		1,000,000	1,027,948
			$6,389,964
Utah – 0.4%
Utah Charter School Finance Authority, Charter School Rev. (Da Vinci Academy of Science & Arts), 4%, 4/15/2047	$	165,000	$144,053

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
Virginia – 6.6%
Henrico County, VA, Economic Development Authority Rev., Residential Care Facility (Westminster - Canterbury of Richmond), “A”, 5%, 10/01/2052	$	225,000	$220,577
Virginia Beach, VA, Development Authority, Residential Care Facility Rev. (Westminster - Canterbury on Chesapeake Bay), “A”, 7%, 9/01/2059		285,000	310,900
Virginia Housing Development Authority, Rental Housing, “D”, 4.875%, 8/01/2065		920,000	922,834
Virginia Small Business Financing Authority, Senior Lien Private Activity Rev. (Transform 66 P3 Project), 5%, 12/31/2052		250,000	246,115
Williamsburg, VA, Economic Development Authority, Student Housing Rev. (Provident Group - Williamsburg Properties LLC - William & Mary Project), “A”, AGM, 5.25%, 7/01/2053		560,000	584,195
			$2,284,621
Washington – 2.5%
Grays Harbor County, WA, Public Hospital District No. 2, Limited Tax General Obligation Refunding, 5%, 12/15/2033	$	80,000	$81,375
Grays Harbor County, WA, Public Hospital District No. 2, Limited Tax General Obligation Refunding, 5%, 12/15/2038		100,000	100,813
Grays Harbor County, WA, Public Hospital District No. 2, Limited Tax General Obligation Refunding, 5%, 12/15/2048		195,000	181,406
Washington State Housing Finance Commission, Municipal Certificates, “1-A”, 4.084%, 3/01/2050		70,046	68,354
Washington State Housing Finance Commission, Nonprofit Housing Refunding Rev. (Horizon House Project), “A”, 6.25%, 1/01/2061		315,000	321,705
Washington State Housing Finance Commission, Nonprofit Rev. (Blakeley & Laurel Villages Portfolio), “A”, BAM, 5.25%, 7/01/2064		100,000	101,228
			$854,881
Wisconsin – 9.6%
Wisconsin Health & Educational Facilities Authority Rev. (Aspirus, Inc. Obligated Group), 4%, 8/15/2048	$	700,000	$622,269
Wisconsin Health & Educational Facilities Authority Rev. (Bellin Memorial Hospital, Inc.), “A”, 5.5%, 12/01/2052		130,000	138,274
Wisconsin Health & Educational Facilities Authority Rev. (St. Camillus Health System, Inc.), “A”, 5%, 11/01/2054		325,000	294,732
Wisconsin Public Finance Authority Rev. (Kahala Nui Project), 5.25%, 11/15/2061		100,000	101,192
Wisconsin Public Finance Authority Rev. (Obligated Group of National Senior Communities, Inc.), 4%, 1/01/2047		195,000	176,093
Wisconsin Public Finance Authority Rev. (Obligated Group of National Senior Communities, Inc.), 4%, 1/01/2052		330,000	283,220

Portfolio of Investments (unaudited) – continued

Issuer		Shares/Par	Value ($)
Municipal Bonds – continued
Wisconsin – continued
Wisconsin Public Finance Authority, Education Rev. (Triad Educational Services, Inc.), 5.5%, 6/15/2062	$	100,000	$94,909
Wisconsin Public Finance Authority, Hotel & Conference Center Facilities Rev. (Foundation of the University of North Carolina at Charlotte, Inc.), “A”, 4%, 9/01/2051 (n)		255,000	195,527
Wisconsin Public Finance Authority, Limited Obligation Grant Rev. (American Dream at Meadowlands Project), “A”, 6.25%, 8/01/2027 (a)(d)(n)		255,000	186,150
Wisconsin Public Finance Authority, Multi-Family Affordable Housing Certificates (Dominium Holdings I), “B-1”, 6.81%, 4/28/2036		195,000	202,287
Wisconsin Public Finance Authority, Project Rev. (Eastern Michigan University Student Housing Project), “A-1”, 5.625%, 7/01/2055		635,000	662,238
Wisconsin Public Finance Authority, Retirement Facilities First Mortgage Rev. (United Methodist Retirement Homes), “A”, 4%, 10/01/2051		15,000	12,966
Wisconsin Public Finance Authority, Senior Secured Rev. (McLemore Hotel & Conference Center), “A”, 4.5%, 6/01/2056 (n)		155,000	119,306
Wisconsin Public Finance Authority, Student Housing Rev. (KSU Bixby Real Estate Foundation LLC Project), “A”, 5.25%, 6/15/2055		100,000	103,367
Wisconsin Public Finance Authority, Student Housing Rev. (University of Hawai'i Foundation Project), “A-1”, 4%, 7/01/2061 (n)		125,000	87,214
Wisconsin Public Finance Authority, Texas Infrastructure Program Improvement & Refunding Rev. (Astro Texas Land Projects), Capital Appreciation, 0%, 12/15/2037		82,000	41,093
			$3,320,837
Total Municipal Bonds (Identified Cost, $59,033,133)			$57,938,062
Other Municipal Bonds – 0.9%
Multi-Family Housing Revenue – 0.9%
Affordable Housing Tax-Exempt, Pass-Thru Trust Certificates, “1”, 6%, 10/05/2040	$	280,485	$284,639
FRETE 2021-ML12 Trust, “X-US”, FHLMC, 1.227%, 7/25/2041 (i)(n)		355,666	30,497
Total Other Municipal Bonds (Identified Cost, $309,314)			$315,136
Bonds – 0.2%
Transportation & Logistics – 0.2%
Toll Road Investors Partnership II LP, Capital Appreciation, NPFG, 0%, 2/15/2033 (n) (Identified Cost, $86,868)	$	120,000	$74,076

Portfolio of Investments (unaudited) – continued

Issuer	Shares/Par	Value ($)
Mutual Funds (h) – 2.6%
Money Market Funds – 2.6%
MFS Institutional Money Market Portfolio, 3.69% (v) (Identified Cost, $883,458)	883,369	$883,458


Other Assets, Less Liabilities – 1.8%		645,297


Remarketable Variable Rate MuniFund Term Preferred Shares (RVMTP shares), at liquidation value (issued by the fund) – (72.7)%		(25,200,000 )
Net assets applicable to common shares – 100.0%		$34,656,029

(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 $883,458 and $58,327,274, respectively.
(i)	Interest only security for which the fund receives interest on notional principal (Par amount). Par amount shown is the notional principal and does not reflect the cost of the security.
(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 $2,554,494, representing 7.4% of net assets applicable to common shares.
(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.
(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	Value
California Statewide Communities Development Authority, College Housing Rev. (NCCD - Hooper Street LLC College of the Arts Project), 5.25%, 7/01/2049	1/16/2019	$101,560	$100,254
% of Net assets applicable to common shares			0.3%

The following abbreviations are used in this report and are defined:
AAC	Ambac Assurance Corp.
AGM	Assured Guaranty Municipal
BAM	Build America Mutual
COP	Certificate of Participation
FHLMC	Federal Home Loan Mortgage Corp.
FNMA	Federal National Mortgage Assn.
GNMA	Government National Mortgage Assn.
NPFG	National Public Finance Guarantee Corp.

Financial Statements

Statement of Assets and Liabilities

At 5/31/26 (unaudited)

This statement represents your fund’s balance sheet, which details the assets and liabilities comprising the total value of the fund.

Assets
Investments in unaffiliated issuers, at value (identified cost, $59,429,315)	$58,327,274
Investments in affiliated issuers, at value (identified cost, $883,458)	883,458
Cash	1,174
Receivables for
Investments sold	60,871
Interest	890,998
Other assets	2,257
Total assets	$60,166,032
Liabilities
Payables for
Distributions on common shares	$55,604
Interest expense and fees	73,508
Common shares tender and repurchase costs	138,203
Payable to affiliates
Investment adviser	2,964
Administrative services fee	206
Transfer agent and dividend disbursing costs	563
Payable for independent Trustees' compensation	2,689
Accrued expenses and other liabilities	36,266
RVMTP shares, at liquidation value of $25,200,000	25,200,000
Total liabilities	$25,510,003
Net assets applicable to common shares	$34,656,029
Net assets consist of
Paid-in capital - common shares	$43,694,876
Total distributable earnings (loss)	(9,038,847 )
Net assets applicable to common shares	$34,656,029
RVMTP shares, at liquidation value of $25,200,000 (252 shares issued and outstanding at $100,000 per share)	25,200,000
Net assets including preferred shares	$59,856,029
Common shares of beneficial interest issued and outstanding (unlimited number of shares authorized)	4,099,610
Net asset value per common share (net assets of $34,656,029 / 4,099,610 shares of beneficial interest outstanding)	$8.45

See Notes to Financial Statements

Financial Statements

Statement of Operations

Six months ended 5/31/26 (unaudited)

This statement describes how much your fund earned in investment income and accrued in expenses. It also describes any gains and/or losses generated by fund operations.

Net investment income (loss)
Income
Interest	$2,419,746
Dividends from affiliated issuers	66,836
Dividends from unaffiliated issuers	27,377
Other	23
Total investment income	$2,513,982
Expenses
Management fee	$330,971
Transfer agent and dividend disbursing costs	7,608
Administrative services fee	12,176
Independent Trustees' compensation	6,467
Stock exchange fee	23,554
Custodian fee	9,270
Shareholder communications	4,198
Audit and tax fees	23,654
Legal fees	1,163
Common shares tender and repurchase costs	150,358
Interest expense and fees	730,280
Miscellaneous	34,074
Total expenses	$1,333,773
Reduction of expenses by investment adviser	(86,518 )
Net expenses	$1,247,255
Net investment income (loss)	$1,266,727
Realized and unrealized gain (loss)
Realized gain (loss) (identified cost basis)
Unaffiliated issuers	$181,779
Affiliated issuers	1,488
Net realized gain (loss)	$183,267
Change in unrealized appreciation or depreciation
Unaffiliated issuers	$(581,090 )
Affiliated issuers	(187 )
Net unrealized gain (loss)	$(581,277 )
Net realized and unrealized gain (loss)	$(398,010 )
Change in net assets from operations	$868,717

See Notes to Financial Statements

Financial Statements

Statement of Cash Flows

Six months ended 5/31/26 (unaudited)

This statement provides a summary of cash flows from investment activity for the fund.

Cash flows from operating activities:
Change in net assets from operations	$868,717
Adjustments to reconcile change in net assets from operations to net cash provided by operating activities:
Purchase of investment securities	(37,215,830 )
Proceeds from disposition of investment securities	90,010,441
Proceeds from disposition of short-term investments, net	692,358
Realized gain/loss on investments	(181,779 )
Unrealized appreciation/depreciation on investments	581,277
Net amortization/accretion of income	64,698
Decrease in interest receivable	800,916
Decrease in accrued expenses and other liabilities	(62,224 )
Decrease in receivable from investment adviser	5,069
Increase in other assets	(241 )
Decrease in payable for interest expense and fees	(118,997 )
Net cash provided by operating activities	$55,444,405
Cash flows from financing activities:
Decrease in RVMTP shares, at liquidation value	$(12,000,000 )
Cash distributions paid on common shares	(2,187,241 )
Increase in payable for common shares tender and repurchase costs	138,203
Tender and repurchase of common shares of beneficial interest	(34,660,563 )
Payment for redemption of floating rate certificates	(6,735,000 )
Net cash used by financing activities	$(55,444,601 )
Net decrease in cash and restricted cash	$(196 )
Cash and restricted cash:
Beginning of period	$1,370
End of period	$1,174

Supplemental disclosure of cash flow information:

Cash paid during the six months ended May 31, 2026 for interest was $849,277.

See Notes to Financial Statements

Financial Statements

Financial Highlights

The financial highlights table is intended to help you understand the fund's financial performance for the semiannual period and the past 5 fiscal years. Certain information reflects financial results for a single fund share. The total returns in the table represent the rate that an investor would have earned (or lost) on an investment in the fund share class (assuming reinvestment of all distributions) held for the entire period.

Common Shares	Six months ended	Year ended
	5/31/26 (unaudited)	11/30/25	11/30/24	11/30/23	11/30/22	11/30/21
Net asset value, beginning of period	$8.62	$8.97	$8.39	$8.42	$10.84	$10.76
Income (loss) from investment operations
Net investment income (loss) (d)	$0.16	$0.36	$0.30	$0.25	$0.33	$0.41
Net realized and unrealized gain (loss)	(0.01 )	(0.34 )	0.58	(0.02 )	(2.33 )	0.13
Total from investment operations	$0.15	$0.02	$0.88	$0.23	$(2.00 )	$0.54
Less distributions declared to common shareholders
From net investment income	$(0.37 )	$(0.37 )	$(0.30 )	$(0.28 )	$(0.35 )	$(0.43 )
From net realized gain	—	—	—	—	(0.07 )	(0.03 )
Total distributions declared to shareholders	$(0.37 )	$(0.37 )	$(0.30 )	$(0.28 )	$(0.42 )	$(0.46 )
Net increase resulting from the tender and repurchase of common shares of beneficial interest	$0.05	$—	$—	$0.02	$—	$—
Net asset value, end of period (x)	$8.45	$8.62	$8.97	$8.39	$8.42	$10.84
Market value, end of period	$7.69	$7.97	$8.24	$7.27	$7.30	$9.87
Total return at market value (%)	1.14 (n)	1.37	17.81	3.51	(22.36 )	7.63
Total return at net asset value (%) (j)(r)(s)(x)	2.77 (n)	0.70	11.12	3.50	(18.41 )	5.46
Ratios (%) (to average net assets applicable to common shares) and Supplemental data:
Expenses before expense reductions	4.02 (a)	3.84	4.22	4.43	2.58	1.84
Expenses after expense reductions	3.76 (a)	3.54	3.92	4.26	2.46	1.77
Net investment income (loss)	3.82 (a)	4.25	3.49	2.99	3.62	3.73
Portfolio turnover rate	45 (n)	11	21	34	27	22
Net assets at end of period (000 omitted)	$34,656	$70,681	$73,568	$68,795	$76,685	$98,774

Financial Highlights – continued

	Six months ended	Year ended
	5/31/26 (unaudited)	11/30/25	11/30/24	11/30/23	11/30/22	11/30/21
Supplemental Ratios (%):
Ratios of expenses to average net assets applicable to common shares after expense reductions and excluding interest expense and fees (l)	1.11 (a)	1.11	1.14	1.25	1.23	1.16
Ratios of expenses to average net assets applicable to common and preferred shares after expense reductions and excluding interest expense and fees (l)	0.72 (a)	0.72	0.72	0.76	0.78	0.78
Senior Securities:
RVMTP shares	252	372	372	438	488	488
Asset coverage per preferred share (k)	$237,524	$290,003	$297,763	$257,067	$257,141	$302,407
Asset coverage per $1 liquidation preference (v)	$2.38	$2.90	$2.98	$2.57	$2.57	$3.02
Involuntary liquidation preference per preferred share (m)	$100,000	$100,000	$100,000	$100,000	$100,000	$100,000
Average market value per preferred share (m)(u)	$100,000	$100,000	$100,000	$100,000	$100,000	$100,000

(a)	Annualized.
(d)	Per share data is based on average shares outstanding.
(j)	Total return at net asset value is calculated using the net asset value of the fund, not the publicly traded price and therefore may be different than the total return at market value.
(k)	Calculated by subtracting the fund’s total liabilities (not including liquidation preference of preferred shares) from the fund's total assets and dividing by the total number of preferred shares outstanding.
(l)	Interest expense and fees include payments made to the holders of the floating rate certificates, interest expense paid to shareholders of RVMTP shares, and amortization of RVMTP shares debt issuance costs, as applicable. For the six months ended May 31, 2026 and the year ended November 30, 2023, the expense ratio also excludes fees and expenses related to the tender and repurchase of a portion of the fund’s common shares of beneficial interest.
(m)	Amount excludes accrued unpaid distributions on preferred shares.
(n)	Not annualized.
(r)	Certain expenses have been reduced without which performance would have been lower.
(s)	From time to time the fund may receive proceeds from litigation settlements, without which performance would be lower.
(u)	Average market value represents the approximate fair value of each of the fund’s preferred shares held at period end.
(v)	Calculated by subtracting the fund's total liabilities (not including liquidation preference of preferred shares) from the fund's total assets and dividing by the aggregate liquidation preference of preferred shares outstanding.
(x)	The net asset values and total returns at net asset value have been calculated on net assets which include adjustments made in accordance with U.S. generally accepted accounting principles required at period end for financial reporting purposes.

See Notes to Financial Statements

Notes to Financial Statements

(unaudited)

(1) Business and Organization

MFS Investment Grade Municipal Trust (the fund) is organized as a Massachusetts business trust and is registered under the Investment Company Act of 1940, as amended, as a diversified closed-end management investment company.

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.

(2) Significant Accounting Policies

General — The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of increases and decreases in net assets from operations during the reporting period. Actual results could differ from those estimates. In the preparation of these financial statements, management has evaluated subsequent events occurring after the date of the fund’s Statement of Assets and Liabilities through the date that the financial statements were issued. The fund invests primarily in municipal instruments, which generally trade in the over-the-counter market. The value of municipal instruments can be affected by changes in their actual or perceived credit quality. The credit quality of, and the ability to pay principal and interest when due by, an issuer of a municipal instrument depends on the credit quality of the entity supporting the municipal instrument, how essential any services supported by the municipal instrument are, the sufficiency of any revenues or taxes that support the municipal instrument, and/or the willingness or ability of the appropriate government entity to approve any appropriations necessary to support the municipal instrument. Municipal instruments may be supported by insurance which typically guarantees the timely payment of all principal and interest due on the underlying municipal instrument. The value of a municipal instrument can be volatile and significantly affected by adverse tax changes or court rulings, legislative or political changes, changes in specific or general market and economic conditions and developments in the region where the instrument is issued, and the financial condition of municipal issuers and of municipal instrument insurers of which there are a limited number. Also, because many municipal instruments are issued to finance similar projects, conditions in certain industries can significantly affect the fund and the overall municipal market. Municipal instruments may be more susceptible to downgrades or defaults during economic downturns or similar periods of economic stress, which in turn could affect the market values and marketability of many or all municipal obligations of issuers in a state, U.S. territory, or possession. If the Internal Revenue Service determines an issuer of a municipal instrument has not complied with the applicable tax requirements, interest from the security could become taxable, the security could decline in value, and certain distributions made by the fund could be taxable to shareholders. The fund invests in high-yield securities rated below investment grade. Investments in below investment grade quality securities can involve a substantially greater risk of default or can already

Notes to Financial Statements (unaudited) - continued

be in default, and their values can decline significantly. Below investment grade quality securities tend to be more sensitive to adverse news about the issuer, or the market or economy in general, than higher quality debt instruments.

Segment Reporting — An operating segment is defined in FASB Accounting Standards Codification Topic 280, Segment Reporting as a component of a public entity that engages in business activities from which it may recognize revenues and incur expenses, has operating results that are regularly reviewed by the entity’s chief operating decision maker (CODM) in making resource allocation decisions and assessing segment performance, and for which discrete financial information is available. The fund represents a single operating segment and the Chairman’s Committee of the fund's adviser acts as the segment’s CODM. The fund’s total returns, expense ratios, and changes in net assets which are used by the CODM to assess segment performance and to make resource allocation decisions to the segment are consistent with that presented within the fund’s financial statements.

Balance Sheet Offsetting — The fund's accounting policy with respect to balance sheet offsetting is that, absent an event of default by the counterparty or a termination of the agreement, the International Swaps and Derivatives Association (ISDA) Master Agreement, or similar agreement, does not result in an offset of reported amounts of financial assets and financial liabilities in the Statement of Assets and Liabilities across transactions between the fund and the applicable counterparty. The fund's right to setoff may be restricted or prohibited by the bankruptcy or insolvency laws of the particular jurisdiction to which a specific master netting agreement counterparty is subject. Balance sheet offsetting disclosures, to the extent applicable to the fund, have been included in the fund’s Significant Accounting Policies note under the captions for each of the fund’s in-scope financial instruments and transactions.

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. Funds traded on a recognized securities exchange (such as Exchange Traded Funds or Closed End Funds) are generally valued at the official closing price on their primary market or exchange as provided by a third-party pricing service. If no sales are reported that day for these funds, generally they will be valued at the last quoted daily bid quotation on their primary market or exchange as provided by a third-party pricing service.

Notes to Financial Statements (unaudited) - continued

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. Pricing services generally value debt instruments assuming orderly transactions of institutional round lot sizes, but a fund may hold or transact in such securities in smaller, odd lot sizes. In instances where a fund holds an odd lot size position in a debt instrument, such position will typically be valued using the pricing agent’s institutional round lot price for the debt instrument. Odd lots may trade at lower prices than institutional round lots, and the fund may receive different prices when it sells odd lot positions than it would receive for sales of institutional round lot positions. 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 May 31, 2026 in valuing the fund's assets and liabilities:

Notes to Financial Statements (unaudited) - continued

Financial Instruments	Level 1	Level 2	Level 3	Total
Municipal Bonds	$—	$58,253,198	$—	$58,253,198
U.S. Corporate Bonds	—	74,076	—	74,076
Investment Companies	883,458	—	—	883,458
Total	$883,458	$58,327,274	$—	$59,210,732

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

Inverse Floaters — The fund invests in municipal inverse floating rate securities in the form of self-deposited secondary market inverse floaters which have variable rates of interest that typically move in the opposite direction of short-term rates. A self-deposited secondary market inverse floater is created when the fund transfers a municipal bond from its portfolio to a special purpose trust (“the trust”) and causes the trust to issue (a) inverse floaters to be held by the fund and (b) floating rate certificates to be held by third parties. The floating rate certificates usually pay tax-exempt interest at short-term rates that reset daily or weekly and the holders of those certificates typically have the option to tender at par plus accrued interest. Self-deposited secondary market inverse floaters are accounted for as secured borrowings, with the municipal bonds transferred to the trust being reflected as fund investments and the amounts owed to floating rate certificate holders being reflected as fund liabilities in the Statement of Assets and Liabilities as “Payable to the holders of the floating rate certificates”.

For the six months ended May 31, 2026, the average payable to the holders of the settled floating rate certificates was $4,775,691 at a weighted average interest rate of 2.42%. Interest expense and fees, which are recorded as incurred, include interest payments made to the holders of the floating rate certificates and associated fees. For the six months ended May 31, 2026, the related interest expense and fees amounted to $73,428 which is included in “Interest expense and fees” in the Statement of Operations. At May 31, 2026, the fund did not hold any self-deposited secondary market inverse floaters and, therefore, there was no payable to the holders of the floating rate certificates.

Statement of Cash Flows — Information on financial transactions which have been settled through the receipt or disbursement of cash or restricted cash is presented in the Statement of Cash Flows. Cash as presented in the fund's Statement of Assets and Liabilities includes cash on hand at the fund's custodian bank and does not include any short-term investments. Restricted cash is presented in the fund's Statement of Assets and Liabilities as cash collateral posted for uncleared derivatives and/or cash pledged for exchange-traded or cleared derivatives and represents cash that has been segregated or delivered to cover the fund's collateral or margin obligations under derivative contracts.

Notes to Financial Statements (unaudited) - continued

The following table provides a reconciliation of cash and restricted cash reported within the Statement of Assets and Liabilities with that shown in the Statement of Cash Flows:

	5/31/26
Cash	$1,174
Restricted cash included in Cash collateral posted	—
Restricted cash included in Cash pledged	—
Total cash and restricted cash in the Statement of Cash Flows	$1,174

Indemnifications — Under the fund's organizational documents, its officers and Trustees may be indemnified against certain liabilities and expenses arising out of the performance of their duties to the fund. Additionally, in the normal course of business, the fund enters into agreements with service providers that may contain indemnification clauses. The fund's maximum exposure under these agreements is unknown as this would involve future claims that may be made against the fund that have not yet occurred.

Investment Transactions and Income — Interest income is recorded on the accrual basis. All premium and discount is amortized or accreted for financial statement purposes in accordance with U.S. generally accepted accounting principles. Interest payments received in additional securities are recorded on the ex-interest date in an amount equal to the value of the security on such date. Debt obligations may be placed on non-accrual status or set to accrue at a rate of interest less than the contractual coupon when the collection of all or a portion of interest has become doubtful. Interest income for those debt obligations may be further reduced by the write-off of the related interest receivables when deemed uncollectible.

The fund may receive proceeds from litigation settlements. Any proceeds received from litigation involving portfolio holdings are reflected in the Statement of Operations in realized gain/loss if the security has been disposed of by the fund or in unrealized gain/loss if the security is still held by the fund. Any other proceeds from litigation not related to portfolio holdings are reflected as other income in the Statement of Operations.

Investment transactions are recorded on the trade date. In determining the net gain or loss on securities sold, the cost of securities is determined on the identified cost basis.

The fund may purchase or sell securities on a when-issued or delayed delivery basis. In these extended settlement transactions, the receipt or delivery of the securities by the fund and related payments occur at a future date, usually beyond the customary settlement period. The price of such security and the date that the security will be settled are generally fixed at the time the transaction is negotiated. The value of the security varies with market fluctuations and for debt securities no interest accrues to the fund until settlement takes place. When the fund sells securities on a when-issued or delayed delivery basis, the fund typically owns or has the right to acquire securities equivalent in kind and amount to the securities sold. Purchase and sale commitments for when-issued or delayed delivery securities are held at carrying amount, which approximates fair value and are categorized as level 2 within the fair value hierarchy, and included in When-issued investments purchased and When-issued investments sold in the Statement of Assets and Liabilities, as applicable. Losses may arise due to changes in the value of the underlying securities prior to settlement date or if the counterparty does not perform under the contract’s terms, or if the issuer does not issue the securities.

Notes to Financial Statements (unaudited) - continued

Tax Matters and Distributions — The fund intends to qualify as a regulated investment company, as defined under Subchapter M of the Internal Revenue Code, and to distribute all of its taxable and tax-exempt income, including realized capital gains. As a result, no provision for federal income tax is required. The fund’s federal tax returns, when filed, will remain subject to examination by the Internal Revenue Service for generally a three year period. Management has analyzed the fund’s tax positions taken on federal and state tax returns for all open tax years and does not believe that there are any uncertain tax positions that require recognition of a tax liability.

Distributions to shareholders are recorded on the ex-dividend date. Income and capital gain distributions are determined in accordance with income tax regulations, which may differ from U.S. generally accepted accounting principles. Certain capital accounts in the financial statements are periodically adjusted for permanent differences in order to reflect their tax character. These adjustments have no impact on net assets or net asset value per share. Temporary differences which arise from recognizing certain items of income, expense, gain or loss in different periods for financial statement and tax purposes will reverse at some time in the future.

Book/tax differences primarily relate to amortization of premium and accretion of discount of debt securities, non-deductible expenses that result from the treatment of preferred shares as equity for tax purposes, and accounting for secured borrowings.

The tax character of distributions made during the six months ended May 31, 2026 will be determined at fiscal year end. The tax character of distributions declared to shareholders for the last fiscal year is as follows:

	Year ended 11/30/25
Ordinary income (including any short-term capital gains)	$140,274
Tax-exempt income	4,322,965
Total distributions	$4,463,239

The federal tax cost and the tax basis components of distributable earnings were as follows:

As of 5/31/26
Cost of investments	$60,422,962
Gross appreciation	776,957
Gross depreciation	(1,989,187)
Net unrealized appreciation (depreciation)	$(1,212,230)
As of 11/30/25
Undistributed ordinary income	91,116
Undistributed tax-exempt income	720,745
Capital loss carryforwards	(8,024,716)
Other temporary differences	(130,488)
Net unrealized appreciation (depreciation)	(330,958)

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

Notes to Financial Statements (unaudited) - continued

As of November 30, 2025, the fund had capital loss carryforwards available to offset future realized gains. These net capital losses may be carried forward indefinitely and their character is retained as short-term and/or long-term losses. Such losses are characterized as follows:

Short-Term	$(1,682,467 )
Long-Term	(6,342,249 )
Total	$(8,024,716 )

(3) Transactions with Affiliates

Investment Adviser — The fund has an investment advisory agreement with MFS to provide overall investment management and related administrative services and facilities to the fund. The management fee is computed daily and paid monthly at an annual rate of 0.65% of the fund’s average daily net assets (including the value of preferred shares). The investment adviser has agreed in writing to reduce its management fee to 0.63% of the fund’s average daily net assets (including the value of preferred shares). This written agreement will continue until modified by the fund’s Board of Trustees, but such agreement will continue at least until November 30, 2026. For the six months ended May 31, 2026, this management fee reduction amounted to $10,204, which is included in the reduction of total expenses in the Statement of Operations. The management fee incurred for the six months ended May 31, 2026 was equivalent to an annual effective rate of 0.63% of the fund's average daily net assets (including the value of preferred shares).

The investment adviser has agreed in writing to pay a portion of the fund’s total annual operating expenses, excluding interest expense on RVMTP shares, taxes, extraordinary expenses, brokerage and transaction costs, certain tax reclaim recovery expenses (including contingency fees and closing agreement expenses), other interest expense, and investment-related expenses (including interest expense and fees associated with investments in inverse floating rate instruments), such that total fund operating expenses do not exceed 0.72% annually of the fund’s average daily net assets (including the value of preferred shares). This written agreement will continue until modified by the fund’s Board of Trustees, but such agreement will continue at least until November 30, 2027. For the six months ended May 31, 2026, this reduction amounted to $76,314, which is included in the reduction of total expenses in the Statement of Operations.

Transfer Agent — The fund engages Computershare Trust Company, N.A. (“Computershare”) as the sole transfer agent for the fund's common shares. MFS Service Center, Inc. (MFSC) monitors and supervises the activities of Computershare for an agreed upon fee approved by the Board of Trustees. For the six months ended May 31, 2026, fees paid to MFSC amounted to $1,600.

Administrator – MFS provides certain financial, legal, shareholder communications, compliance, and other administrative services to the fund. Under an administrative services agreement, the fund reimburses MFS the costs incurred to provide these services. The fund is charged an annual fixed amount of $17,500 plus a fee based on average daily net assets (including the value of preferred shares). The administrative services fee is computed daily and paid monthly. The administrative services fee incurred for the six months ended May 31, 2026 was equivalent to an annual effective rate of 0.0239% of the fund’s average daily net assets (including the value of preferred shares).

Notes to Financial Statements (unaudited) - continued

Trustees’ and Officers’ Compensation — The fund pays compensation to independent Trustees in the form of a retainer, attendance fees, and additional compensation to Board and Committee chairpersons. Independent Trustees’ compensation is accrued daily and paid subsequent to each Trustee Board meeting. The fund does not pay compensation directly to Trustees or officers of the fund who are also officers of the investment adviser, all of whom receive remuneration from MFS for their services to the fund. Certain officers and Trustees of the fund are officers or directors of MFS and MFSC.

Other — The fund invests in the MFS Institutional Money Market Portfolio which is managed by MFS and seeks current income consistent with preservation of capital and liquidity. This money market fund does not pay a management fee to MFS but does incur investment and operating costs.

(4) Portfolio Securities

For the six months ended May 31, 2026, purchases and sales of investments, other than short-term obligations, were as follows:

	Purchases	Sales
U.S. Government securities	$—	$133,398
Non-U.S. Government securities	46,612,432	99,121,640

(5) Shares of Beneficial Interest

The fund’s Declaration of Trust permits the Trustees to issue an unlimited number of full and fractional shares of beneficial interest. The fund reserves the right to repurchase shares of beneficial interest of the fund subject to Trustee approval.

On April 13, 2026, the fund commenced a cash tender offer (the “offer”) for up to 50% of the fund's outstanding common shares at a price per share equal to 99% of the fund's net asset value per share calculated at the close of regular trading on the New York Stock Exchange on May 12, 2026. This offer was oversubscribed and, as such, the fund purchased the maximum number of common shares offered in the offer (4,099,610 common shares representing 50% of the fund's then outstanding common shares). The purchase price of the tendered common shares was equal to $8.45 per share for an aggregate purchase price of $34,660,563. Payment for the tendered common shares was made by the fund on May 14, 2026.

During the six months ended May 31, 2026 and the year ended November 30, 2025, the fund did not repurchase any additional shares other than through this tender offer and there were no other transactions in fund shares.

Notes to Financial Statements (unaudited) - continued

(6) Line of Credit

The fund and certain other funds managed by MFS participate in a $1.45 billion unsecured committed line of credit of which $1.2 billion is reserved for use by the fund and certain other MFS U.S. funds. The line of credit is provided by a syndicate of banks under a credit agreement. Borrowings may be made for temporary financing needs. Interest is charged to each fund, based on its borrowings, generally at a rate equal to the highest of 1) Daily Simple SOFR (Secured Overnight Financing Rate), 2) the Federal Funds Effective Rate, or 3) the Overnight Bank Funding Rate, each plus an agreed upon spread. A commitment fee, based on the average daily unused portion of the committed line of credit, is allocated among the participating funds. The line of credit expires on March 11, 2027 unless extended or renewed. In addition, the fund and other funds managed by MFS have established unsecured uncommitted borrowing arrangements with certain banks for temporary financing needs. Interest is charged to each fund, based on its borrowings, at rates equal to customary reference rates plus an agreed upon spread. For the six months ended May 31, 2026, the fund’s commitment fee and interest expense were $182 and $0, respectively, and are included in “Interest expense and fees” in the Statement of Operations.

(7) 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. The following were affiliated issuers for the six months ended May 31, 2026:

Affiliated Issuers	Beginning Value	Purchases	Sales Proceeds	Realized Gain (Loss)	Change in Unrealized Appreciation or Depreciation	Ending Value
MFS Institutional Money Market Portfolio	$1,575,816	$77,389,624	$78,083,283	$1,488	$(187 )	$883,458

Affiliated Issuers	Dividend Income	Capital Gain Distributions
MFS Institutional Money Market Portfolio	$66,836	$—

(8) Preferred Shares

As of May 7, 2026, the fund had 372 shares issued and outstanding of RVMTP shares. On May 8, 2026, to reduce leverage attributable to preferred shares, the fund optionally redeemed 120 RVMTP shares at a redemption price equal to the liquidation preference of $100,000 per share, plus accumulated and unpaid dividends. Effective May 8, 2026, the fund has 252 shares issued and outstanding of RVMTP shares. The outstanding RVMTP shares are redeemable at the option of the fund in whole or in part at the liquidation preference of $100,000 per share, plus accumulated and unpaid dividends, but generally for the purpose of decreasing the leverage of the fund. The RVMTP shares have a stated maturity date of 2051 but are subject to a mandatory early term redemption date of January 20, 2028, and at each 42 month anniversary from that date and subsequent extensions of the RVMTP shares, unless the holder(s) of the RVMTP shares agrees to retain the RVMTP shares. Otherwise, the RVMTP shares are subject to mandatory tender for remarketing to another purchaser. In the event the remarketing is unsuccessful, the RVMTP shares would be subject to redemption at the

Notes to Financial Statements (unaudited) - continued

liquidation preference of $100,000 per share, plus accumulated and unpaid dividends. There is no assurance that the term of the RVMTP shares will be extended or that the RVMTP shares will be replaced with any other preferred shares or other form of leverage upon the redemption of the RVMTP shares. Dividends on the RVMTP shares are cumulative and reset weekly to a fixed spread against the Securities Industry and Financial Markets Association (SIFMA) Municipal Swap Index. During the six months ended May 31, 2026, the dividend rates on the RVMTP shares ranged from 2.48% to 4.85%. For the six months ended May 31, 2026, the average dividend rate was 3.58%.

In the fund’s Statement of Assets and Liabilities, the RVMTP shares aggregate liquidation preference is shown as a liability since they have a stated mandatory redemption date. Dividends paid on the RVMTP shares are treated as interest expense and recorded as incurred. For the six months ended May 31, 2026, interest expense related to the dividends paid on RVMTP shares amounted to $654,418 and is included in “Interest expense and fees” in the Statement of Operations. Costs directly related to the issuance of the RVMTP shares are considered debt issuance costs. Debt issuance costs are presented as a direct deduction from the carrying amount of the related debt liability and are amortized into interest expense over the life of the RVMTP shares. The period-end carrying value for the RVMTP shares in the fund’s Statement of Assets and Liabilities is its liquidation value less any unamortized debt issuance costs, which approximates its fair value. Its fair value would be considered level 2 under the fair value hierarchy.

Under the terms of a purchase agreement between the fund and the investor in the RVMTP shares, the fund is subject to various investment restrictions. These investment-related requirements are in various respects more restrictive than those to which the fund is otherwise subject in accordance with its investment objectives and policies. In addition, the fund is subject to certain restrictions on its investments imposed by guidelines of the rating agency that rates the RVMTP shares, which guidelines may be changed by the applicable rating agency, in its sole discretion, from time to time. These guidelines may impose asset coverage or portfolio composition requirements that are more stringent than those imposed on the fund by the Investment Company Act of 1940 (the “1940 Act”).

The fund is required to maintain certain asset coverage with respect to the RVMTP shares as defined in the fund’s governing documents and the 1940 Act. One of a number of asset coverage-related requirements is that the fund is not permitted to declare or pay common share dividends unless immediately thereafter the fund has a minimum asset coverage ratio of at least 200% with respect to the RVMTP shares after deducting the amount of such common share dividends. The fund may be subject to more stringent asset coverage levels which exceed the requirements under the 1940 Act and may change from time to time as agreed to by the fund and the holders of the RVMTP shares.

The 1940 Act requires that the preferred shareholders of the fund, voting as a separate class, have the right to elect at least two trustees at all times, and elect a majority of the trustees at any time when dividends on the preferred shares are unpaid for two full years. Unless otherwise required by law or under the terms of the preferred shares, each preferred share is entitled to one vote and preferred shareholders will vote together with common shareholders as a single class.

Notes to Financial Statements (unaudited) - continued

Leverage involves risks and special considerations for the fund’s common shareholders. To the extent that investments are purchased by the fund with proceeds from the issuance of preferred shares, the fund’s net asset value will increase or decrease at a greater rate than a comparable unleveraged fund. Changes in the value of the fund’s portfolio will be borne entirely by the common shareholders. It is possible that the fund will be required to sell assets at a time when it may be disadvantageous to do so in order to redeem preferred shares to comply with asset coverage or other restrictions including those imposed by the 1940 Act and the rating agency that rates the preferred shares. There is no assurance that the fund’s leveraging strategy will be successful.

(9) Subsequent Event

On December 10, 2025, the Board of Trustees (the “Board”) of the fund approved a reorganization of the fund with and into the MFS Municipal Income Trust (“MFM”) (the “Reorganization”), subject to approval by the fund’s shareholders and the satisfaction of certain other conditions. The Reorganization was approved by the fund’s shareholders at the Special Meeting of Shareholders held on April 7, 2026, and all other conditions have been satisfied or waived. The Reorganization was completed on June 8, 2026 (the “Closing Date”), and, as of the Closing Date, shareholders of the fund became shareholders of MFM. In connection with the Reorganization, on the Closing Date, the fund’s outstanding RVMTP shares were exchanged for newly issued RVMTP shares of MFM. Additionally, as of the Closing Date, abrdn Inc. (“Aberdeen”) became the appointed investment manager of MFM, which was renamed the Aberdeen Municipal Income Fund. On the Closing Date, MFS ceased serving as the appointed investment manager of MFM.

Report of Independent Registered Public

Accounting Firm

To the Shareholders and the Board of Trustees of MFS Investment Grade Municipal Trust

Results of Review of Interim Financial Statements

We have reviewed the accompanying statement of assets and liabilities of MFS Investment Grade Municipal Trust (the “Fund”), including the portfolio of investments, as of May 31, 2026, and the related statements of operations, changes in net assets, cash flows and financial highlights for the six-month period then ended and the related notes (collectively referred to as the “interim financial statements”). Based on our review, we are not aware of any material modifications that should be made to the interim financial statements for them to be in conformity with U.S. generally accepted accounting principles.

We have previously audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (“PCAOB”), the statement of assets and liabilities, including the portfolio of investments, as of November 30, 2025 , the statement of operations and the statement of changes in net assets for the year ended November 30, 2025, the financial highlights for each of the five years in the period then ended, and the related notes (not presented herein); and in our report dated January 14, 2026, we expressed an unqualified opinion on those financial statements. In our opinion, the information set forth in the accompanying statement of changes in net assets for the year ended November 30, 2025 and the financial highlights for each of the five years in the period then ended, is fairly stated, in all material respects, in relation to the statement of changes in net assets and the financial highlights from which it has been derived.

Basis for Review Results

These financial statements are the responsibility of the Fund's management. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Fund in accordance with the U.S. federal securities laws and the applicable rules and regulations of the SEC and the PCAOB. We conducted our review in accordance with the standards of the PCAOB. A review of interim financial statements consists principally of applying analytical procedures and making inquiries of persons responsible for financial and accounting matters. It is substantially less in scope than an audit conducted in accordance with the standards of the PCAOB, the objective of which is the expression of an opinion regarding the financial statements taken as a whole. Accordingly, we do not express such an opinion.

/s/ Ernst & Young LLP

Boston, Massachusetts
July 16, 2026

Proxy Voting Policies and Information

MFS votes proxies on behalf of the fund pursuant to proxy voting policies and procedures that are available without charge, upon request, by calling 1-800-225-2606, by visiting mfs.com/proxyvoting, or by visiting the SEC’s Web site at http://www.sec.gov.

Information regarding how the fund voted proxies relating to portfolio securities during the most recent twelve-month period ended June 30 is available by August 31 of each year without charge by visiting mfs.com/proxyvoting, or by visiting the SEC’s Web site at http://www.sec.gov.

Quarterly Portfolio Disclosure

The fund files a complete schedule of portfolio holdings with the SEC for the first and third quarters of each fiscal year as an exhibit to its reports on Form N-PORT. The fund’s Form N-PORT reports are available on the SEC’s Web site at http://www.sec.gov. A shareholder can obtain the portfolio holdings report for the first and third quarters of the fund's fiscal year at mfs.com/closedendfunds by choosing the fund's name and then scrolling to the “Resources” section and clicking on the “Reports and Other Documents” tab.

Further Information

From time to time, MFS may post important information about the fund or the MFS Funds on the MFS Web site (mfs.com). This information is available at https://www.mfs.com/announcements or at mfs.com/closedendfunds by choosing the fund's name and then scrolling to the “Resources” section and clicking on the “Announcements” tab, if any.

Additional information about the fund (e.g., performance, dividends and the fund’s price history) is also available at mfs.com/closedendfunds by choosing the fund's name, if any.

INFORMATION ABOUT FUND CONTRACTS AND LEGAL CLAIMS

The fund has entered into contractual arrangements with an investment adviser, administrator, transfer agent, and custodian who each provide services to the fund. Unless expressly stated otherwise, shareholders are not parties to, or intended beneficiaries of these contractual arrangements, and these contractual arrangements are not intended to create any shareholder right to enforce them against the service providers or to seek any remedy under them against the service providers, either directly or on behalf of the fund.

Under the Trust’s By-Laws, any claims asserted against or on behalf of the MFS Funds, including claims against Trustees and Officers, must be brought in state and federal courts located within the Commonwealth of Massachusetts.

ITEM 5. AUDIT COMMITTEE OF LISTED REGISTRANTS.

Not applicable for semi-annual reports.

ITEM 6. INVESTMENTS

A schedule of investments of the Registrant is included as part of the report to shareholders of the Registrant under Item 1(a) of this Form N-CSR.

ITEM 7. FINANCIAL STATEMENTS AND FINANCIAL HIGHLIGHTS FOR OPEN-END MANAGEMENT INVESTMENT COMPANIES.

Not applicable to the Registrant.

ITEM 8. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS FOR OPEN-END MANAGEMENT INVESTMENT COMPANIES.

Not applicable to the Registrant.

ITEM 9. PROXY DISCLOSURES FOR OPEN-END MANAGEMENT INVESTMENT COMPANIES.

Not applicable to the Registrant.

ITEM 10. RENUMERATION PAID TO DIRECTORS, OFFICERS, AND OTHERS OF OPEN-END MANAGEMENT INVESTMENT COMPANIES.

Not applicable to the Registrant.

ITEM 11. STATEMENT REGARDING BASIS FOR APPROVAL OF INVESTMENT ADVISORY CONTRACT.

Not applicable.

ITEM 12. DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED-END MANAGEMENT INVESTMENT COMPANIES.

Not applicable for semi-annual reports.

ITEM 13. PORTFOLIO MANAGERS OF CLOSED-END MANAGEMENT INVESTMENT COMPANIES.

There were no changes during the period.

ITEM 14. PURCHASES OF EQUITY SECURITIES BY CLOSED-END MANAGEMENT INVESTMENT COMPANY AND AFFILIATED PURCHASERS.

MFS Investment Grade Municipal Trust

			(c) Total	(d) Maximum
			Number of	Number (or
	(a) Total number	(b)	Shares	Approximate
Period	of Shares	Average	Purchased as	Dollar Value) of
	Purchased	Price	Part of Publicly	Shares that May
		Paid per	Announced	Yet Be Purchased
		Share	Plans or	under the Plans
			Programs	or Programs

12/01/25-12/31/25	0	N/A	0	819,922
01/01/26-01/31/26	0	N/A	0	819,922
02/01/26-02/28/26	0	N/A	0	819,922
03/01/26-03/31/26	0	N/A	0	819,922
04/01/26-04/30/26	0	N/A	0	819,922
05/01/26-05/31/26	4,099,610	8.54	4,099,610	0
Total	4,099,610	8.54	4,099,610

Note: The Board approved procedures to repurchase shares and reviews the results periodically. The notification to shareholders of the program is part of the semi-annual and annual reports sent to shareholders. These annual programs begin on October 1st of each year. The programs conform to the conditions of Rule 10b-18 of the Securities Exchange Act of 1934 and limit the aggregate number of shares that may be purchased in each annual period (October 1 through the following September 30) to 10% of the Registrant’s outstanding shares as of the first day of the plan year (October 1). The aggregate number of shares available for purchase for the October 1, 2025, plan year is 819,922. The 4,099,610 shares purchased were purchased pursuant to a tender offer dated May 12, 2026. A copy of this offer is attached as an exhibit to this filing.

ITEM 15. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.

There were no material changes to the procedures by which shareholders may send recommendations to the Board for nominees to the Registrant’s Board since the Registrant last provided disclosure as to such procedures in response to the requirements of Item 407 (c)(2)(iv) of Regulation S-K or this Item.

ITEM 16. 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 report on Form N-CSR, 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 period covered by the report that have materially affected, or are reasonably likely to materially affect, the Registrant’s internal control over financial reporting.

ITEM 17. DISCLOSURE OF SECURITIES LENDING ACTIVITIES FOR CLOSED-END MANAGEMENT INVESTMENT COMPANIES.

Not applicable for semi-annual reports.

ITEM 18. RECOVERY OF ERRONEOUSLY AWARDED COMPENSATION.

Not applicable.

ITEM 19. EXHIBITS.

(a)(1) Any code of ethics, or amendment thereto, that is the subject of the disclosure required by Item 2, to the extent that the registrant intends to satisfy the Item 2 requirements through filing of an exhibit: Not applicable.

(2)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 as EX-99.302CERT.

(3)Any written solicitation to purchase securities under Rule 23c-1 under the Act (17 CFR 270.23c-1) sent or given during the period covered by the report by or on behalf of the registrant to 10 or more persons. Not applicable.

(4)Change in the registrant’s independent public accountant. Not applicable.

(b)If the report is filed under Section 13(a) or 15(d) of the Exchange Act, provide the certifications required by Rule 30a-2(b) under the Act (17 CFR 270.30a-2(b)), Rule 13a-14(b) or Rule 15d-14(b) under the Exchange Act (17 CFR 240.13a-14(b) or 240.15d-14(b)) and Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. 1350) as an exhibit. A certification furnished pursuant to this paragraph will not be deemed “filed” for the purposes of Section 18 of the Exchange Act (15 U.S.C. 78r), or otherwise subject to the liability of that section. Such certification will not be deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Exchange Act, except to the extent that the registrant specifically incorporates it by reference. Attached hereto as EX-99.906CERT.

(c)Registrant’s Rule 30e-3 Notice pursuant to Item 1(b) of Form N-CSR. Attached hereto as EX-99.30e-3Notice.

Notice

A copy of the Amended and Restated 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 INVESTMENT GRADE MUNICIPAL TRUST

By (Signature and Title)*

/S/ DAVID L. DILORENZO

David L. DiLorenzo, President

Date: July 16, 2026

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)*

/S/ DAVID L. DILORENZO

David L. DiLorenzo, President (Principal Executive Officer)

Date: July 16, 2026

By (Signature and Title)*

/S/ KASEY L. PHILLIPS

Kasey L. Phillips, Treasurer (Principal Financial Officer and Accounting Officer) Date: July 16, 2026

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

Portfolio composition	1
Portfolio managers’ profiles	3
Other notes	3
Portfolio of investments	4
Statement of assets and liabilities	21
Statement of operations	22
Statements of changes in net assets	23
Statement of cash flows	24
Financial highlights	25
Notes to financial statements	27
Report of independent registered public accounting firm	38
Results of shareholder meeting	39
Proxy voting policies and information	40
Quarterly portfolio disclosure	40
Further information	40
Information about fund contracts and legal claims	40

	Six months ended	Year ended
	5/31/26 (unaudited)	11/30/25
Change in net assets
From operations
Net investment income (loss)	$1,266,727	$2,950,997
Net realized gain (loss)	183,267	(757,527 )
Net unrealized gain (loss)	(581,277 )	(2,079,428 )
Change in net assets from operations	$868,717	$114,042
Distributions to common shareholders	$(2,233,263 )	$(3,000,914 )
Share transactions applicable to common shares
Change in net assets from the tender and repurchase of common shares of beneficial interest	$(34,660,563 )	$—
Total change in net assets	$(36,025,109 )	$(2,886,872 )
Net assets applicable to common shares
At beginning of period	70,681,138	73,568,010
At end of period	$34,656,029	$70,681,138

Number of Shares
For	Against/ Withheld/ Abstention
3,515,837	657,648