FundWatcher
MPOLX
MFS Alabama Municipal Bond Fund
MFS Municipal Series Trust

Portfolio moves

Net position changes between two of this fund's N-PORT snapshots. These are differences between point-in-time reports — not a trade log — and share counts can be affected by splits and other corporate actions.

Dec 31, 2025 → Mar 31, 2026

Expand a category to see the positions behind it, ranked by weight.

Security Shares Dec 2025 Shares Mar 2026 Δ shares End % Δ value
City of Huntsville 0 750,000 750,000 1.15% $801.00K
AL BBEUTL 5 07/01/2033 0 400,000 400,000 0.60% $418.12K
BALDWIN CNTY AL INDL DEV AUTH REGD V/R B/E AMT 4.30000000 0 150,000 150,000 0.21% $145.45K
Security Shares Dec 2025 Shares Mar 2026 Δ shares End % Δ value
PUERTO RICO ELECTRIC POWER AUTHORITY 5.0% 07-01-32 100,000 0 -100,000 0.00% -$66.75K
PUERTO RICO ELECTRIC POWER AUTHORITY 5.0% 07-01-37 95,000 0 -95,000 0.00% -$63.41K
Puerto Rico Electric Power Authority, Series ZZ 50,000 0 -50,000 0.00% -$33.38K
CONNECTICUT ST HSG FIN AUTH HSG MTGE FIN PROGRAM 25,000 0 -25,000 0.00% -$25.06K
Security Shares Dec 2025 Shares Mar 2026 Δ shares End % Δ value
MFS Institutional Money Market Portfolio, Class A 720,807 1,620,157 899,350 2.32% $899.21K
Security Shares Dec 2025 Shares Mar 2026 Δ shares End % Δ value
ALABAMA ST HSG FIN AUTH SF MTG REGD B/E GNMA/FN 5.75000000 740,000 730,000 -10,000 1.14% -$18.96K
ALABAMA ST HSG FIN AUTH SF MTG REGD B/E GNMA/FN 5.75000000 735,000 725,000 -10,000 1.12% -$17.92K
AL HSG 6% 4/1/2055 725,000 715,000 -10,000 1.12% -$14.91K
AL ALSSFM 4.55 10/01/2044 725,000 720,000 -5,000 1.02% -$15.36K
AL HSG 5.05% 10/1/2045 500,000 495,000 -5,000 0.72% -$6.84K
Alabama Housing Finance Authority, Series 2024A 475,000 455,000 -20,000 0.70% -$26.12K
City of Chicago, Series 2023 A 270,000 255,000 -15,000 0.38% -$16.93K
NFA 2022-1 A 4.375% 09-20-36 213,522 212,705 -817 0.31% -$3.45K
STADIUM TRACE VLG IMPT DIST DEV INCENTIVE ANTIC BONDS 200,000 180,000 -20,000 0.23% -$19.96K
TOLL ROAD INV PART II INSURED 144A 02/43 0.00000 109,932 93,288 -16,644 0.05% -$5.73K
Security Shares Dec 2025 Shares Mar 2026 Δ shares End % Δ value
Auburn University, Series 2018 A, RB 1,500,000 1,500,000 0 2.17% -$7.74K
Baldwin County Public Building Authority 1,250,000 1,250,000 0 1.71% -$10.25K
Irondale Public Building Authority, Series 2024 1,000,000 1,000,000 0 1.51% -$3.84K
Jefferson (County of), AL, Series 2024, Ref. Revenue Wts. 1,000,000 1,000,000 0 1.49% -$5.94K
City of Oxford 1,000,000 1,000,000 0 1.45% -$14.87K
State of Alabama Docks Department 1,000,000 1,000,000 0 1.45% -$6.30K
Public Energy Authority of Kentucky, Gas Supply Revenue Bonds, Series 2022A-1 1,000,000 1,000,000 0 1.45% $1.40K
Cherokee County Board of Education 1,000,000 1,000,000 0 1.45% -$683
Special Care Facilities Financing Authority of the City of Pell City Alabama 1,000,000 1,000,000 0 1.42% -$15.18K
Mobile County Board of School Commissioners 1,000,000 1,000,000 0 1.42% -$21.12K
ALABAMA ST HSG FIN AUTH MF TAX REGD N/C B/E 4.45000000 1,000,000 1,000,000 0 1.40% -$22.75K
Lawrence County Board of Education 1,000,000 1,000,000 0 1.37% -$5.84K
Mobile County Board of School Commissioners 1,000,000 1,000,000 0 1.35% -$331
INFIRMARY HLTH SYS AL SPL CARE FACS FING AUTH REVENUE 1,000,000 1,000,000 0 1.35% -$30.73K
DCH HLTH CARE -A-REV 1,000,000 1,000,000 0 1.32% -$7.80K
HLTH CARE AUTH FOR BAPTIST HLT HLTMED 11/37 FIXED 5 875,000 875,000 0 1.31% -$20.39K
Orange Beach Water Sewer & Fire Protection Authority 1,000,000 1,000,000 0 1.29% -$14.18K
Alabama Community College System, Series 2019 1,000,000 1,000,000 0 1.24% -$25.62K
City of Arab 1,120,000 1,120,000 0 1.18% -$8.78K
Cooper Green Mercy Health Services Authority, Series 2022, RB 810,000 810,000 0 1.18% -$11.11K
MOBILE AL 0% 2/15/2042 750,000 750,000 0 1.16% -$9.61K
Alabama Federal Aid Highway Finance Authority, Series 2025, RB 750,000 750,000 0 1.14% -$2.94K
ALABAMA ST HIGHWAY AUTH SPL OBLIG REVENUE 750,000 750,000 0 1.14% -$8.15K
City of Huntsville 750,000 750,000 0 1.14% -$2.48K
Birmingham-Jefferson Civic Center Authority, Series 2023A 750,000 750,000 0 1.10% -$8.35K
Alabama Community College System, Series 2025 750,000 750,000 0 1.10% -$5.99K
JACKSONVILLE PUBLIC EDUCTNL BLDG AUTH 750,000 750,000 0 1.10% -$1.70K
Prattville Waterworks Board, Series 2023 750,000 750,000 0 1.09% -$13.72K
Harvest-Monrovia Water Sewer & Fire Protection Authority, Inc., Series 2025 750,000 750,000 0 1.09% -$2.63K
Lauderdale County Agriculture Center Authority, Series 2024 750,000 750,000 0 1.09% -$15.66K
UNIV SOUTH AL 5% 4/1/2049 750,000 750,000 0 1.08% -$4.55K
PUERTO RICO SALES TAX FING COR REGD OID B/E 5.00000000 796,000 796,000 0 1.08% -$9.64K
City of Fort Payne 750,000 750,000 0 1.08% -$2.75K
County of Mobile 675,000 675,000 0 1.02% -$2.32K
Madison Water & Wastewater Board 1,000,000 1,000,000 0 1.00% -$26.26K
Cherokee County Public Building Authority 750,000 750,000 0 0.99% -$25.09K
Alabama Community College System, Series 2024 750,000 750,000 0 0.99% -$25.37K
Cullman City Board of Education 750,000 750,000 0 0.97% -$27.96K
Limestone County Water & Sewer Authority, Series 2024 750,000 750,000 0 0.97% -$20.73K
City of Clanton 550,000 550,000 0 0.84% -$5.22K
Jacksonville Public Educational Building Authority 580,000 580,000 0 0.83% -$3.23K
Enterprise Board of Education 500,000 500,000 0 0.77% -$1.99K
City of Gadsden AL 500,000 500,000 0 0.76% $4.12K
MONTGOMERY WTRWORKS 500,000 500,000 0 0.76% -$2.35K
GADSDEN AL 500,000 500,000 0 0.76% $3.40K
Jefferson County Board of Education 500,000 500,000 0 0.76% -$2.00K
SOUTHEAST ENRG 5% MT 500,000 500,000 0 0.75% -$3.98K
County of Mobile 500,000 500,000 0 0.75% -$3.40K
Jefferson County Board of Education, Series 2024 500,000 500,000 0 0.75% -$3.27K
UNIV SOUTH AL 5.25% 4/1/2054 500,000 500,000 0 0.74% -$4.83K
Alabama Community College System, Series 2023 500,000 500,000 0 0.74% -$2.21K
Selma Industrial Development Board, Series 2020A 500,000 500,000 0 0.74% -$3.79K
Town of Pike Road 500,000 500,000 0 0.73% -$5.04K
Town of Pike Road 500,000 500,000 0 0.73% -$6.73K
Alabama Community College System, Series 2023 500,000 500,000 0 0.73% -$5.39K
County of Marshall, Series 2025 500,000 500,000 0 0.72% -$10.72K
City of Prattville 500,000 500,000 0 0.72% -$10.55K
Homewood Educational Building Authority 500,000 500,000 0 0.72% -$601
City of Prattville 500,000 500,000 0 0.72% -$8.99K
MOBILE PCR AL PWR-C 500,000 500,000 0 0.72% -$111
DCH HLT CARE AL 5% 6/1/2033 500,000 500,000 0 0.72% -$75
JACKSONVILL FLO 5% 8/1/2056 500,000 500,000 0 0.71% -$7.78K
JEFFERSON CO-REV-REF 500,000 500,000 0 0.69% -$10.77K
Marshall County Board of Education 500,000 500,000 0 0.68% -$1.14K
Baldwin County Solid Waste Disposal Authority, Inc., Series 2023 500,000 500,000 0 0.67% -$10.79K
Little Rock School District 625,000 625,000 0 0.67% -$8.56K
St Clair County Board of Education 500,000 500,000 0 0.67% -$11.59K
St Clair County Board of Education 500,000 500,000 0 0.66% -$10.43K
North Carolina (State of) Medical Care Commission (Rex Healthcare), Series 2020, RB 490,000 490,000 0 0.65% -$1.82K
Marshall County Board of Education 500,000 500,000 0 0.65% -$13.71K
City of Rainsville 500,000 500,000 0 0.65% -$13.51K
WALKER COUNTY BOARD OF EDUCATION AL 500,000 500,000 0 0.64% -$18.74K
Mobile (County of), AL (Gomessa), Series 2020, Revenue Wts. 500,000 500,000 0 0.64% -$6.52K
East Alabama Health Care Authority (The) 500,000 500,000 0 0.64% -$10.14K
BLACK BELT ENERGY GAS VAR 425,000 425,000 0 0.64% -$2.86K
Prichard Water Works & Sewer Board 700,000 700,000 0 0.63% -$14.00K
California (State of) Community Choice Financing Authority (Green Bonds), Series 2023 C, RB 410,000 410,000 0 0.62% -$1.94K
Maryland Community Development Administration 385,000 385,000 0 0.55% -$1.20K
Lee County Board of Education 350,000 350,000 0 0.53% -$2.99K
RESTRUCTURED-SER A-2 401,000 401,000 0 0.53% -$4.14K
NEW YORK CITY NY HSG 520,000 520,000 0 0.53% $1.45K
Lee County Board of Education 325,000 325,000 0 0.49% -$1.21K
BLACK BELT ENERGY GAS VAR 310,000 310,000 0 0.47% -$6.31K
NY TRANS CORP(JFK INT NEW ONE)/AGM 5.25% 6/30/60@ 325,000 325,000 0 0.47% -$3.00K
Southeast Energy Authority, Alabama, A Cooperative District Energy Supply Revenue Bonds Series 2024A 300,000 300,000 0 0.44% -$12.12K
WI PUBTRN 5.75 12/31/2065 290,000 290,000 0 0.42% -$2.67K
MASS DEVEL FIN 4% 7/1/2051 345,000 345,000 0 0.40% -$5.66K
PENNSYLVANIA ST ECON DEV FING REGD OID B/E AMT AG 5.00000000 275,000 275,000 0 0.39% $3.16K
Lee County Board of Education 250,000 250,000 0 0.38% -$868
NY NYCDEV 5 11/15/2044 260,000 260,000 0 0.37% $422
Montevallo American Village Public Educational Building Authority 250,000 250,000 0 0.35% -$7.60K
Tender Option Bond Trust Receipts 225,000 225,000 0 0.35% -$6.03K
Birmingham Special Care Facilities Financing Authority, Alabama, Revenue Bonds, Methodist Home for the Aging, Refunding Series 2015-1 250,000 250,000 0 0.34% $2.10K
Bessemer Public Educational Building Authority 210,000 210,000 0 0.30% -$20
PUERTO RICO SALES TAX FING COR REGD ZCP OID B/E 0.00000000 247,000 247,000 0 0.29% $2.38K
TX WTR DEV BRD-A -REV 200,000 200,000 0 0.29% -$2.53K
IL CHIEDU 4 12/01/2047 255,000 255,000 0 0.29% $5.15K
VIRGINIA ST SMALL BUSINESS FIN REGD OID B/E AMT 3.00000000 250,000 250,000 0 0.29% -$5.09K
VIRGIN ISLANDS HOTEL DEV FING REGD OID B/E 6.00000000 200,000 200,000 0 0.28% -$2.18K
PUERTO RICO SALES TAX FING COR REGD ZCP OID B/E 0.00000000 237,000 237,000 0 0.26% $2.64K
Tender Option Bond Trust Receipts 150,000 150,000 0 0.23% -$2.95K
GOLDEN ST TOBACCO SEC 170,000 170,000 0 0.22% -$30
Village of Bridgeview 160,000 160,000 0 0.21% -$312
RESTRUCTURED-SER A-2 142,000 142,000 0 0.20% $1.01K
City of Ozark 140,000 140,000 0 0.20% $397
CHICAGO IL BRD OF EDU DEDICATE REGD B/E 5.75000000 125,000 125,000 0 0.19% -$405
Maryland Community Development Administration 130,000 130,000 0 0.18% -$2.28K
State of Illinois, Series 2020 120,000 120,000 0 0.18% -$1.96K
RESTRUCTURED-SER A1 115,194 115,194 0 0.18% -$788
GUAM GVT WTSW 5% 1/1/2046 120,000 120,000 0 0.17% $18
RESTRUCTURED-SER A1 121,336 121,336 0 0.15% -$1.73K
Guam (Territory of) Waterworks Authority, Series 2020 A, RB 95,000 95,000 0 0.14% $534
TERRITORY OF GUAM SECTION 30 REVENUE 5.0% 12-01-46 85,000 85,000 0 0.12% -$223
Puerto Rico, General Obligation Bonds, Vintage CW NT Claims Taxable Series 2022 121,245 121,245 0 0.12% $3.64K
Wisconsin (State of) Public Finance Authority (American Dream at Meadowlands), Series 2017, RB 100,000 100,000 0 0.10% -$7.00K
IOWASTUD LIQUID 3.5% 12/1/2044 @ 90,000 90,000 0 0.10% -$1.18K
Puerto Rico Electric Power Authority, Series UU 70,000 70,000 0 0.10% $223
Cedar Port Navigation & Improvement District, Series 2023 70,000 70,000 0 0.09% -$1.42K
RESTRUCTURED-SER A-2- 58,000 58,000 0 0.08% $413
Territory of Guam, Series F 60,000 60,000 0 0.08% -$764
State of Illinois, Series 2023B 55,000 55,000 0 0.08% -$647
RESTRUCTURED-SER A1 57,199 57,199 0 0.08% $147
PUERTO RICO SALES TAX FING COR REGD OID B/E 4.75000000 57,000 57,000 0 0.08% -$648
Puerto Rico Industrial Tourist Educational Medical & Environmental Control Facilities Financing Authority 50,000 50,000 0 0.07% -$77
DENVER CO ARPT 4.125% 11/15/2047 @ 55,000 55,000 0 0.07% -$782
PREREF NEW JERSEY ST TRANSPRTN TRUST REGD B/E PREREFUNDED 12/15/32 @ 100 5.50000000 40,000 40,000 0 0.07% -$1.02K
CHICAGO IL BRD OF EDU DEDICATED CAPITAL IMPT TAX 45,000 45,000 0 0.07% $518
PUERTO RICO ELECTRIC POWER AUTHORITY 5.25% 07-01-27 65,000 65,000 0 0.06% -$244
DENVER CO ARPT 4.13% 11/15/53@ 50,000 50,000 0 0.06% -$1.73K
PUERTO RICO SALES TAX FING COR REGD ZCP OID B/E 0.00000000 110,000 110,000 0 0.06% $1.80K
MATCHING FUND SPL PURPOSE SECURITIZTN CORP 35,000 35,000 0 0.05% -$131
RESTRUCTURED-SER A1 31,477 31,477 0 0.04% -$48
RESTRUCTURED-SER A1 33,016 33,016 0 0.04% $27
Territory of Guam, Series A 30,000 30,000 0 0.04% -$141
RESTRUCTURED-CABS-SER 40,508 40,508 0 0.04% $85
Cedar Port Navigation & Improvement District, Series 2023 30,000 30,000 0 0.04% -$1.02K
RESTRUCTURED-SER A1 24,283 24,283 0 0.03% -$94
PUERTO RICO SALES TAX FING COR REGD OID B/E 4.55000000 16,000 16,000 0 0.02% -$68
REF-SER VV-NATL NON 15,000 15,000 0 0.02% -$281
Puerto Rico Electric Power Authority, Series SS 15,000 15,000 0 0.02% -$15
CO ST HLTH FACS AUTH 15,000 15,000 0 0.02% -$45
PUERTO RICO SALES TAX FING COR REGD ZCP OID B/E 0.00000000 4,000 4,000 0 0.01% $41

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