{
  "page": "compare",
  "query": {
    "a": "MIVAX",
    "b": "MFSMX"
  },
  "retrieved_at": "2026-07-07T14:35:03+00:00",
  "disclaimer": "Informational only — not investment advice. FundWatcher presents publicly available data and makes no recommendation to buy or sell any security. Verify all figures against the source filing before relying on them.",
  "attribution": "Data sourced from U.S. SEC EDGAR filings (Forms N-PORT, N-CEN, and prospectus Risk/Return summaries). FundWatcher is not affiliated with the SEC.",
  "terms": {
    "notice": "Use of this data is subject to the FundWatcher Terms of Service. Information may be used only for personal, non-commercial research and may not be redistributed.",
    "url": "https://fundwatcher.app/terms/"
  },
  "fund_a": {
    "name": "MFS Virginia Municipal Bond Fund",
    "ticker": "MIVAX",
    "slug": "MIVAX",
    "series_id": "S000002527",
    "html_url": "https://fundwatcher.app/funds/MIVAX/"
  },
  "fund_b": {
    "name": "MFS Maryland Municipal Bond Fund",
    "ticker": "MFSMX",
    "slug": "MFSMX",
    "series_id": "S000002533",
    "html_url": "https://fundwatcher.app/funds/MFSMX/"
  },
  "overlap": {
    "coverage_a_by_b": "0.1263526766442389572485748945",
    "coverage_b_by_a": "0.1263526766442389572485748945",
    "shared_count": 59,
    "as_of": {
      "a": "2026-03-31",
      "b": "2026-03-31"
    },
    "a_top": [
      {
        "name": "MFS Institutional Money Market Portfolio, Class A",
        "value": "7156754.28",
        "weight": "0.02097584",
        "shared": true
      },
      {
        "name": "PUERTO RICO SALES TAX FING COR REGD OID B/E 5.00000000",
        "value": "5981471.55",
        "weight": "0.01753119",
        "shared": true
      },
      {
        "name": "Washington Metropolitan Area Transit Authority, Series 2020 A, RB",
        "value": "5116317.00",
        "weight": "0.01499549",
        "shared": false
      },
      {
        "name": "VIRGINIA ST CLG BLDG",
        "value": "4310952.40",
        "weight": "0.01263504",
        "shared": false
      },
      {
        "name": "RIVERSIDE HEALTHCARE ASSOCIATION OBLIGATED GROUP AG 5.25% 07-01-48",
        "value": "4175078.40",
        "weight": "0.01223680",
        "shared": false
      },
      {
        "name": "Virginia Port Authority, Series 2025",
        "value": "4162214.80",
        "weight": "0.01219910",
        "shared": false
      },
      {
        "name": "Hampton Roads Transportation Accountability Commission, Series 2024, RB",
        "value": "4145218.40",
        "weight": "0.01214928",
        "shared": false
      },
      {
        "name": "VIRGINIA ST HSG DEV AUTH",
        "value": "4052210.40",
        "weight": "0.01187668",
        "shared": true
      },
      {
        "name": "VIRGINIA ELECTRIC AND POWER CO (MPT) 3.65% 11-01-35",
        "value": "4048550.00",
        "weight": "0.01186596",
        "shared": false
      },
      {
        "name": "City of Alexandria, Series 2025",
        "value": "4044553.26",
        "weight": "0.01185424",
        "shared": false
      },
      {
        "name": "RICHMOND REDEV HSG-FN",
        "value": "3997195.33",
        "weight": "0.01171544",
        "shared": false
      },
      {
        "name": "Washington Metropolitan Area Transit Authority, Series 2018, RB",
        "value": "3912809.82",
        "weight": "0.01146811",
        "shared": true
      },
      {
        "name": "County of Spotsylvania",
        "value": "3904738.77",
        "weight": "0.01144446",
        "shared": false
      },
      {
        "name": "Norfolk Redevelopment & Housing Authority, Series 2024",
        "value": "3882068.21",
        "weight": "0.01137801",
        "shared": false
      },
      {
        "name": "Virginia Housing Development Authority, Series 2023 D",
        "value": "3807492.00",
        "weight": "0.01115944",
        "shared": false
      },
      {
        "name": "MTRO WA DC ARPT 5.25% 10/1/48@",
        "value": "3697021.08",
        "weight": "0.01083565",
        "shared": false
      },
      {
        "name": "VA FAIDEV 4 05/15/2048",
        "value": "3674940.00",
        "weight": "0.01077094",
        "shared": false
      },
      {
        "name": "MWAA DULLES TOL 4% 10/1/2052",
        "value": "3589037.45",
        "weight": "0.01051916",
        "shared": true
      },
      {
        "name": "Virginia Resources Authority",
        "value": "3505580.54",
        "weight": "0.01027456",
        "shared": false
      },
      {
        "name": "HAMPTON ROADS VA TRANSPRTN ACCOUNTABILITY COMMISSION",
        "value": "3424960.40",
        "weight": "0.01003827",
        "shared": false
      },
      {
        "name": "New River Valley Regional Jail Authority",
        "value": "3228872.12",
        "weight": "0.00946355",
        "shared": false
      },
      {
        "name": "VIRGINIA SMALL BUSINESS FINANCING AUTHORITY",
        "value": "3158552.10",
        "weight": "0.00925745",
        "shared": true
      },
      {
        "name": "Fairfax (County of), VA Industrial Development Authority (Inova Health System), Series 2024, RB",
        "value": "3092767.50",
        "weight": "0.00906464",
        "shared": false
      },
      {
        "name": "CHESAPEAKE REDEV HSG",
        "value": "3050055.77",
        "weight": "0.00893945",
        "shared": false
      },
      {
        "name": "Fairfax County Water Authority",
        "value": "3038691.90",
        "weight": "0.00890615",
        "shared": false
      },
      {
        "name": "Hampton Roads Sanitation District, Series 2016 A, Ref. RB",
        "value": "3025379.10",
        "weight": "0.00886713",
        "shared": false
      },
      {
        "name": "Virginia Housing Development Authority, Series 2024F SUB F-3",
        "value": "3013354.50",
        "weight": "0.00883189",
        "shared": false
      },
      {
        "name": "LYNCHBURG VA ECON DEV AUTH HOSP REVENUE",
        "value": "3000458.70",
        "weight": "0.00879409",
        "shared": false
      },
      {
        "name": "Fairfax County Redevelopment & Housing Authority, Series 2024A",
        "value": "2941515.00",
        "weight": "0.00862133",
        "shared": false
      },
      {
        "name": "VIRGINIA ST SMALL BUSINESS FIN VIRGINIA SMALL BUSINESS FINANCING AUTHORITY",
        "value": "2937253.85",
        "weight": "0.00860884",
        "shared": false
      },
      {
        "name": "Arlington County Industrial Development Authority",
        "value": "2933740.32",
        "weight": "0.00859854",
        "shared": false
      },
      {
        "name": "Virginia Housing Development Authority",
        "value": "2923440.30",
        "weight": "0.00856836",
        "shared": false
      },
      {
        "name": "VIRGINIA ST SMALL BUS",
        "value": "2894089.61",
        "weight": "0.00848233",
        "shared": false
      },
      {
        "name": "Henry County Industrial Development Authority",
        "value": "2855236.20",
        "weight": "0.00836845",
        "shared": false
      },
      {
        "name": "CHESAPEAKE BRDG 5% 7/1/2051",
        "value": "2854426.20",
        "weight": "0.00836608",
        "shared": false
      },
      {
        "name": "HAMPTON ROADS TRANSPORTATION FUND 5.0% 07-01-54",
        "value": "2834071.91",
        "weight": "0.00830642",
        "shared": false
      },
      {
        "name": "City of Petersburg, Series 2024",
        "value": "2783439.90",
        "weight": "0.00815803",
        "shared": false
      },
      {
        "name": "VIRGINIA ST CMWLTH TRANSPRTN BRD TRANSPRTN REVENUE",
        "value": "2773881.83",
        "weight": "0.00813001",
        "shared": false
      },
      {
        "name": "MWAA DULLES TOL 4% 10/1/2044",
        "value": "2731648.50",
        "weight": "0.00800623",
        "shared": false
      },
      {
        "name": "VIRGINIA ST HSG DEV AUTH REGD B/E 5.15000000",
        "value": "2711923.09",
        "weight": "0.00794842",
        "shared": false
      },
      {
        "name": "Virginia Housing Development Authority",
        "value": "2696737.20",
        "weight": "0.00790391",
        "shared": false
      },
      {
        "name": "NORFOLK VA ECON DEV AUTH HOSPF NORMED 11/48 FIXED 4",
        "value": "2695011.00",
        "weight": "0.00789885",
        "shared": false
      },
      {
        "name": "VIRGINIA ST SMALL BUSINESS FIN VASMED 06/55 FIXED 5.25",
        "value": "2554395.25",
        "weight": "0.00748672",
        "shared": false
      },
      {
        "name": "UNIVERSITY OF VIRGINIA",
        "value": "2526072.00",
        "weight": "0.00740370",
        "shared": false
      },
      {
        "name": "Virginia Housing Development Authority",
        "value": "2525592.44",
        "weight": "0.00740230",
        "shared": false
      },
      {
        "name": "Virginia Housing Development Authority",
        "value": "2496274.53",
        "weight": "0.00731637",
        "shared": false
      },
      {
        "name": "VIRGINIA ST RESOURCES AUTH INFRASTRUCTURE REVENUE",
        "value": "2486125.40",
        "weight": "0.00728662",
        "shared": false
      },
      {
        "name": "MWAA DULLES TOL 4% 10/1/2053",
        "value": "2418899.48",
        "weight": "0.00708959",
        "shared": false
      },
      {
        "name": "VIRGINIA ST SMALL BUSINESS FIN REGD OID B/E AMT 3.00000000",
        "value": "2407733.40",
        "weight": "0.00705686",
        "shared": false
      },
      {
        "name": "City of Alexandria, Series 2025",
        "value": "2363118.58",
        "weight": "0.00692610",
        "shared": false
      }
    ],
    "b_top": [
      {
        "name": "MFS Institutional Money Market Portfolio, Class A",
        "value": "5117103.28",
        "weight": "0.03287827",
        "shared": true
      },
      {
        "name": "MARYLAND ST ECON DEV CORP LEASE REVENUE",
        "value": "2066416.60",
        "weight": "0.01327708",
        "shared": false
      },
      {
        "name": "Maryland Economic Development Corp., Series 2024",
        "value": "1956308.20",
        "weight": "0.01256962",
        "shared": false
      },
      {
        "name": "Montgomery (County of), MD, Series 2017, GO Bonds",
        "value": "1900000.00",
        "weight": "0.01220783",
        "shared": false
      },
      {
        "name": "MARYLAND ST STD 5% 5/1/2035",
        "value": "1785164.72",
        "weight": "0.01146999",
        "shared": false
      },
      {
        "name": "PUERTO RICO SALES TAX FING COR REGD OID B/E 5.00000000",
        "value": "1727325.78",
        "weight": "0.01109837",
        "shared": true
      },
      {
        "name": "County of Prince George's, Series 2025 A",
        "value": "1607726.55",
        "weight": "0.01032992",
        "shared": false
      },
      {
        "name": "Washington Metropolitan Area Transit Authority Dedicated",
        "value": "1607187.60",
        "weight": "0.01032646",
        "shared": false
      },
      {
        "name": "Maryland Stadium Authority, Series 2024",
        "value": "1571792.40",
        "weight": "0.01009904",
        "shared": false
      },
      {
        "name": "County of Anne Arundel, Series 2025",
        "value": "1562597.40",
        "weight": "0.01003996",
        "shared": false
      },
      {
        "name": "MD HLTH & HGR EDL-A",
        "value": "1561890.15",
        "weight": "0.01003541",
        "shared": false
      },
      {
        "name": "Maryland Health & Higher Educational Facilities Authority",
        "value": "1554150.45",
        "weight": "0.00998568",
        "shared": false
      },
      {
        "name": "PRINCE GEO COP 5% 10/1/48",
        "value": "1524666.75",
        "weight": "0.00979625",
        "shared": false
      },
      {
        "name": "Maryland Community Development Administration, Series 2025 F-1",
        "value": "1506350.25",
        "weight": "0.00967856",
        "shared": false
      },
      {
        "name": "MARYLAND STADIUM AUTHORITY",
        "value": "1492435.35",
        "weight": "0.00958915",
        "shared": false
      },
      {
        "name": "WASHINGTON SUBURBAN SANITARY COMMISSION",
        "value": "1461898.35",
        "weight": "0.00939295",
        "shared": false
      },
      {
        "name": "COUNTY OF BALTIMORE MD",
        "value": "1457850.60",
        "weight": "0.00936694",
        "shared": false
      },
      {
        "name": "County of Howard",
        "value": "1424096.70",
        "weight": "0.00915007",
        "shared": false
      },
      {
        "name": "MARYLAND ST HLTH & HGR EDUCTNL FACS AUTH REVENUE",
        "value": "1406792.17",
        "weight": "0.00903888",
        "shared": false
      },
      {
        "name": "Maryland Health & Higher Educational Facilities Authority, Series 2004",
        "value": "1396223.21",
        "weight": "0.00897098",
        "shared": false
      },
      {
        "name": "County of Anne Arundel, Series 2023",
        "value": "1393211.60",
        "weight": "0.00895163",
        "shared": false
      },
      {
        "name": "City of Baltimore, Series 2019 A",
        "value": "1392087.02",
        "weight": "0.00894440",
        "shared": false
      },
      {
        "name": "Maryland Community Development Administration Department of Housing and Community Development, Residential Revenue Bonds, Taxable Series 2019D",
        "value": "1391971.66",
        "weight": "0.00894366",
        "shared": false
      },
      {
        "name": "MARYLAND ST STA 4% 6/1/2046",
        "value": "1314577.29",
        "weight": "0.00844639",
        "shared": false
      },
      {
        "name": "MARYLAND HEALTH & HIGHER EDUCATIONAL FACILITIES AUTHORITY",
        "value": "1288038.33",
        "weight": "0.00827587",
        "shared": false
      },
      {
        "name": "Maryland Health & Higher Educational Facilities Authority",
        "value": "1260651.72",
        "weight": "0.00809990",
        "shared": false
      },
      {
        "name": "MONTGOMERY CNTY MD REVENUE REGD B/E 5.00000000",
        "value": "1240317.19",
        "weight": "0.00796925",
        "shared": false
      },
      {
        "name": "Maryland Community Development Administration Local Government Infrastructure",
        "value": "1230218.13",
        "weight": "0.00790436",
        "shared": false
      },
      {
        "name": "MD CMNTY DEV-D-1",
        "value": "1190841.13",
        "weight": "0.00765136",
        "shared": false
      },
      {
        "name": "Washington Metropolitan Area Transit Authority, Series 2018, RB",
        "value": "1155596.68",
        "weight": "0.00742491",
        "shared": true
      },
      {
        "name": "MD HEFA 4% 7/1/2048",
        "value": "1108365.50",
        "weight": "0.00712144",
        "shared": false
      },
      {
        "name": "County of Montgomery",
        "value": "1107250.70",
        "weight": "0.00711428",
        "shared": false
      },
      {
        "name": "MD CMNTY DEPT ADMIN-B",
        "value": "1097910.15",
        "weight": "0.00705426",
        "shared": false
      },
      {
        "name": "Maryland Health & Higher Educational Facilities Authority",
        "value": "1094371.76",
        "weight": "0.00703153",
        "shared": false
      },
      {
        "name": "CALIFORNIA COMMUNITY VAR",
        "value": "1081998.20",
        "weight": "0.00695203",
        "shared": false
      },
      {
        "name": "MD TRANSPRTN-A-REF",
        "value": "1080306.40",
        "weight": "0.00694116",
        "shared": false
      },
      {
        "name": "Montgomery County Housing Opportunities Commission, Series 2023 C",
        "value": "1076666.80",
        "weight": "0.00691777",
        "shared": false
      },
      {
        "name": "Maryland Department of Housing & Community Development, Series 2024 E",
        "value": "1076506.43",
        "weight": "0.00691674",
        "shared": false
      },
      {
        "name": "MD ECON DEV CORP-A",
        "value": "1072393.30",
        "weight": "0.00689031",
        "shared": false
      },
      {
        "name": "County of Prince George's",
        "value": "1040425.00",
        "weight": "0.00668491",
        "shared": false
      },
      {
        "name": "MARYLAND ST ECON DEV CORP AIR CARGO REVENUE",
        "value": "1040054.84",
        "weight": "0.00668253",
        "shared": false
      },
      {
        "name": "Washington Metropolitan Area Transit Authority, Series 2025, RB",
        "value": "1038645.70",
        "weight": "0.00667348",
        "shared": false
      },
      {
        "name": "Maryland Stadium Authority Sports Entertainment Facilities Revenue, Series 2023 A",
        "value": "1034419.30",
        "weight": "0.00664632",
        "shared": false
      },
      {
        "name": "State of Maryland Department of Transportation, Series 2024 A",
        "value": "1032954.50",
        "weight": "0.00663691",
        "shared": false
      },
      {
        "name": "MARYLAND ST HLTH & HGR EDUCTNL MARYLAND HEALTH & HIGHER EDUCATIONAL FACILITIES AU",
        "value": "1031303.10",
        "weight": "0.00662630",
        "shared": false
      },
      {
        "name": "MARYLAND ST HLTH & HGR EDUCTNL FACS AUTH REVENUE",
        "value": "1025953.80",
        "weight": "0.00659193",
        "shared": false
      },
      {
        "name": "Maryland Department of Housing & Community Development, Series 2025 D",
        "value": "1024100.00",
        "weight": "0.00658002",
        "shared": false
      },
      {
        "name": "State of Maryland Department of Transportation, Series 2024 A",
        "value": "1023701.30",
        "weight": "0.00657746",
        "shared": false
      },
      {
        "name": "MARYLAND ST STA 4% 6/1/2036",
        "value": "1022381.10",
        "weight": "0.00656898",
        "shared": false
      },
      {
        "name": "Montgomery County Housing Opportunities Commission, Series 2025A",
        "value": "1021211.30",
        "weight": "0.00656146",
        "shared": false
      }
    ]
  },
  "error": null,
  "sources": [
    {
      "label": "N-PORT (fund A)",
      "accession_no": "0002071691-26-011426",
      "as_of": "2026-03-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/751656/000207169126011426/0002071691-26-011426-index.htm"
    },
    {
      "label": "N-PORT (fund B)",
      "accession_no": "0002071691-26-011429",
      "as_of": "2026-03-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/751656/000207169126011429/0002071691-26-011429-index.htm"
    }
  ]
}