MFIAX
MFS Municipal Income Fund
MFS Municipal Series Trust

Portfolio concentration

As of March 31, 2026 · N-PORT
Holdings
2292
Top-10 weight
6.23%
Effective holdings ?
577
Crowding ?
26.5

Holdings

As of March 31, 2026 · N-PORT
#SecurityTickerSharesValue% of fund
1 MFS Institutional Money Market Portfolio, Class A 168,421,496 $168.42M 2.42%
2 Black Belt Energy Gas District 35,010,000 $36.52M 0.53%
3 TEXAS ST MUNI GAS ACQUISITION& TEXAS MUNICIPAL GAS ACQUISITION & SUPPLY CORP IV 29,755,000 $32.48M 0.47%
4 PRINCETON TX INDEP SCH DIST 28,405,000 $29.64M 0.43%
5 NY TRANS CORP(JFK INT NEW ONE)/AGM 5.25% 6/30/60@ 29,020,000 $29.15M 0.42%
6 NY TRANS CORP(JFK INT NEW ONE)/AGM 5.13% 6/30/60@ 29,265,000 $29.04M 0.42%
7 New Hampshire Business Finance Authority, Series 2023A 27,905,000 $28.62M 0.41%
8 California (State of) Community Choice Financing Authority (Green Bonds), Series 2023 C, RB CCEDEV 26,240,000 $27.76M 0.40%
9 BLACK BELT ENGY GAS-C BBEUTL 23,250,000 $25.08M 0.36%
10 NOVANT HEALTH OBLIGATED GROUP 5.5% 06-01-50 23,440,000 $24.28M 0.35%
11 PUERTO RICO SALES TAX FING COR REGD OID B/E 5.00000000 PRCGEN 24,407,000 $23.20M 0.33%
12 VIRGINIA ST HSG DEV AUTH 22,080,000 $21.83M 0.31%
13 PENNSYLVANIA ST ECON DEV FING REGD OID B/E AMT AG 5.00000000 PASDEV 21,860,000 $21.81M 0.31%
14 QUEEN CREEK AZ COPS 20,605,000 $21.66M 0.31%
15 Connecticut State Health & Educational Facilities Authority, Series A 20,000,000 $21.38M 0.31%
16 METROCARE SVC REV 20,790,000 $21.22M 0.31%
17 NY TRANSPRTN DEV CORP NYTTRN 20,015,000 $20.73M 0.30%
18 MD HLTH HGR AUTH-A 20,000,000 $20.55M 0.30%
19 WV HOSP 5.375% 9/1/2053 WVSMED 19,920,000 $20.47M 0.29%
20 TENNERGY CORP TN GAS REVENUE TGYPWR 10/53 ADJUSTABLE VAR 19,225,000 $20.44M 0.29%
21 JEA WTR & SWR REV-A 19,530,000 $20.43M 0.29%
22 Black Belt Energy Gas District, Series 2025 A BBEUTL 19,750,000 $20.11M 0.29%
23 Delaware State Housing Authority, Series BDS 2023 19,524,158 $19.93M 0.29%
24 TX PRIVATE ACTIVITY TXSTRN 18,960,000 $19.28M 0.28%
25 Energy Southeast Cooperative District, Alabama, Energy Supply Revenue Bonds, Series 2025B ESDPWR 18,915,000 $19.24M 0.28%
26 Alachua County Health Facilities Authority, Series 2025 A 18,585,000 $19.13M 0.28%
27 Southeast Energy Authority, Alabama, Commodity Supply Revenue Bonds, Project 5, Series 2023A SEEPWR 18,165,000 $19.05M 0.27%
28 TOWER HEALTH OBLIGATED GROUP 5.0% 06-30-39 BERFAC 19,469,000 $18.32M 0.26%
29 MAIN STR NAT GA 5% MT MAIUTL 17,500,000 $18.31M 0.26%
30 SPOKANE CNTY WA ARPT REVENUE 18,010,000 $18.30M 0.26%
31 BLACK BELT ENERGY GAS VAR BBEUTL 17,190,000 $18.13M 0.26%
32 CHICAGO ILLIN 6% 4/1/2046 CHIEDU 17,805,000 $18.00M 0.26%
33 California (State of) Housing Finance Agency (Social Certificates), Series 2023-1, RB 17,779,749 $17.90M 0.26%
34 Fishers Town Hall Building Corp., Series 2023 A, RB 16,030,000 $17.35M 0.25%
35 MASSACHUSETTS ST DEV FIN AGY R REGD B/E 5.00000000 MASDEV 17,000,000 $17.21M 0.25%
36 Maryland Department of Housing & Community Development, Series 2024 E 15,400,000 $17.18M 0.25%
37 WISCONSIN ST HT 4% 4/1/2040 17,300,000 $16.83M 0.24%
38 New Hampshire Business Finance Authority, Series 2024A 16,680,000 $16.75M 0.24%
39 PENNSYLVANIA ST ECON DEV FING REGD B/E AMT 5.00000000 PASDEV 16,660,000 $16.68M 0.24%
40 Public Energy Authority of Kentucky, Gas Supply Revenue Bonds, Series 2025B KYSPWR 16,355,000 $16.51M 0.24%
41 COLORADO ST HLTH FACS AUTH REV REGD B/E 4.00000000 18,540,000 $16.30M 0.23%
42 ORANGE HLTH FACS-A ORAMED 15,410,000 $15.91M 0.23%
43 Jefferson (County of), AL, Series 2024, Ref. Revenue Wts. JEFUTL 15,180,000 $15.78M 0.23%
44 SAN ANTONIO WTR 5.25% 5/15/2052 15,000,000 $15.58M 0.22%
45 Travis County Healthcare District 15,000,000 $15.50M 0.22%
46 Energy Southeast A Cooperative District, Series B-1 ESDPWR 14,150,000 $15.44M 0.22%
47 MICHIGAN ST HSG DEV AUTH RENTAL HSG REVENUE 15,980,000 $15.43M 0.22%
48 FRETE ML-15 TRUST 15,549,013 $15.40M 0.22%
49 California Community Choice Financing Authority, Series C CCEDEV 14,840,000 $15.40M 0.22%
50 NY NYCDEV 5 11/15/2044 NYCDEV 15,300,000 $15.30M 0.22%
1 / 46 Next ›

Machine-readable: JSON · Markdown. Programmatic access via the agent surface.