MFSMX
MFS Maryland Municipal Bond Fund
MFS Municipal Series Trust

Portfolio concentration

As of March 31, 2026 · N-PORT
Holdings
230
Top-10 weight
13.43%
Effective holdings ?
140
Crowding ?
20.9

Holdings

As of March 31, 2026 · N-PORT
#SecurityTickerSharesValue% of fund
1 MFS Institutional Money Market Portfolio, Class A 5,117,103 $5.12M 3.26%
2 MARYLAND ST ECON DEV CORP LEASE REVENUE 2,000,000 $2.07M 1.31%
3 Maryland Economic Development Corp., Series 2024 2,000,000 $1.96M 1.24%
4 Montgomery (County of), MD, Series 2017, GO Bonds 1,900,000 $1.90M 1.21%
5 MARYLAND ST STD 5% 5/1/2035 1,725,000 $1.79M 1.14%
6 PUERTO RICO SALES TAX FING COR REGD OID B/E 5.00000000 PRCGEN 1,817,000 $1.73M 1.10%
7 County of Prince George's, Series 2025 A 1,500,000 $1.61M 1.02%
8 Washington Metropolitan Area Transit Authority Dedicated 1,500,000 $1.61M 1.02%
9 Maryland Stadium Authority, Series 2024 1,500,000 $1.57M 1.00%
10 County of Anne Arundel, Series 2025 1,500,000 $1.56M 0.99%
11 MD HLTH & HGR EDL-A 1,500,000 $1.56M 0.99%
12 Maryland Health & Higher Educational Facilities Authority 1,500,000 $1.55M 0.99%
13 PRINCE GEO COP 5% 10/1/48 1,500,000 $1.52M 0.97%
14 Maryland Community Development Administration, Series 2025 F-1 1,500,000 $1.51M 0.96%
15 MARYLAND STADIUM AUTHORITY 1,500,000 $1.49M 0.95%
16 WASHINGTON SUBURBAN SANITARY COMMISSION 1,500,000 $1.46M 0.93%
17 COUNTY OF BALTIMORE MD 1,500,000 $1.46M 0.93%
18 County of Howard 1,500,000 $1.42M 0.91%
19 MARYLAND ST HLTH & HGR EDUCTNL FACS AUTH REVENUE 1,475,000 $1.41M 0.90%
20 Maryland Health & Higher Educational Facilities Authority, Series 2004 1,385,000 $1.40M 0.89%
21 County of Anne Arundel, Series 2023 1,315,000 $1.39M 0.89%
22 City of Baltimore, Series 2019 A 1,545,000 $1.39M 0.89%
23 Maryland Community Development Administration Department of Housing and Community Development, Residential Revenue Bonds, Taxable Series 2019D 1,765,000 $1.39M 0.89%
24 MARYLAND ST STA 4% 6/1/2046 1,405,000 $1.31M 0.84%
25 MARYLAND HEALTH & HIGHER EDUCATIONAL FACILITIES AUTHORITY 1,155,000 $1.29M 0.82%
26 Maryland Health & Higher Educational Facilities Authority 1,205,000 $1.26M 0.80%
27 MONTGOMERY CNTY MD REVENUE REGD B/E 5.00000000 1,240,000 $1.24M 0.79%
28 Maryland Community Development Administration Local Government Infrastructure 1,210,000 $1.23M 0.78%
29 MD CMNTY DEV-D-1 COMMFH 1,250,000 $1.19M 0.76%
30 Washington Metropolitan Area Transit Authority, Series 2018, RB 1,140,000 $1.16M 0.74%
31 MD HEFA 4% 7/1/2048 1,250,000 $1.11M 0.71%
32 County of Montgomery 1,000,000 $1.11M 0.70%
33 MD CMNTY DEPT ADMIN-B 1,500,000 $1.10M 0.70%
34 Maryland Health & Higher Educational Facilities Authority 1,145,000 $1.09M 0.70%
35 CALIFORNIA COMMUNITY VAR CCEDEV 1,000,000 $1.08M 0.69%
36 MD TRANSPRTN-A-REF 1,000,000 $1.08M 0.69%
37 Montgomery County Housing Opportunities Commission, Series 2023 C 1,000,000 $1.08M 0.69%
38 Maryland Department of Housing & Community Development, Series 2024 E 965,000 $1.08M 0.68%
39 MD ECON DEV CORP-A 1,000,000 $1.07M 0.68%
40 County of Prince George's 1,000,000 $1.04M 0.66%
41 MARYLAND ST ECON DEV CORP AIR CARGO REVENUE 1,100,000 $1.04M 0.66%
42 Washington Metropolitan Area Transit Authority, Series 2025, RB 1,000,000 $1.04M 0.66%
43 Maryland Stadium Authority Sports Entertainment Facilities Revenue, Series 2023 A 1,000,000 $1.03M 0.66%
44 State of Maryland Department of Transportation, Series 2024 A 1,000,000 $1.03M 0.66%
45 MARYLAND ST HLTH & HGR EDUCTNL MARYLAND HEALTH & HIGHER EDUCATIONAL FACILITIES AU 1,000,000 $1.03M 0.66%
46 MARYLAND ST HLTH & HGR EDUCTNL FACS AUTH REVENUE 1,000,000 $1.03M 0.65%
47 Maryland Department of Housing & Community Development, Series 2025 D 1,000,000 $1.02M 0.65%
48 State of Maryland Department of Transportation, Series 2024 A 1,000,000 $1.02M 0.65%
49 MARYLAND ST STA 4% 6/1/2036 1,000,000 $1.02M 0.65%
50 Montgomery County Housing Opportunities Commission, Series 2025A 1,000,000 $1.02M 0.65%
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