{
  "page": "compare",
  "query": {
    "a": "MWVIX",
    "b": "MFSMX"
  },
  "retrieved_at": "2026-07-07T15:23:05+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 West Virginia Municipal Bond Fund",
    "ticker": "MWVIX",
    "slug": "MWVIX",
    "series_id": "S000002528",
    "html_url": "https://fundwatcher.app/funds/MWVIX/"
  },
  "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": "0.08541929172752468806937281643",
    "coverage_b_by_a": "0.08541929172752468806937281643",
    "shared_count": 50,
    "as_of": {
      "a": "2026-03-31",
      "b": "2026-03-31"
    },
    "a_top": [
      {
        "name": "West Virginia (State of) (Bidding Group 2), Series 2019 A, GO Bonds",
        "value": "2055052.80",
        "weight": "0.02499777",
        "shared": false
      },
      {
        "name": "Morgantown Utility Board, Inc., Series 2018 B, RB",
        "value": "2052191.40",
        "weight": "0.02496296",
        "shared": false
      },
      {
        "name": "West Virginia University",
        "value": "2031417.00",
        "weight": "0.02471026",
        "shared": false
      },
      {
        "name": "WV HOSP 4% 6/1/2051",
        "value": "1936645.42",
        "weight": "0.02355746",
        "shared": false
      },
      {
        "name": "PUERTO RICO SALES TAX FING COR REGD OID B/E 5.00000000",
        "value": "1751091.96",
        "weight": "0.02130037",
        "shared": true
      },
      {
        "name": "WV HOSP 5% 9/1/2039",
        "value": "1519568.85",
        "weight": "0.01848411",
        "shared": false
      },
      {
        "name": "WV ST WTR 5% 11/1/2033",
        "value": "1490487.65",
        "weight": "0.01813037",
        "shared": false
      },
      {
        "name": "MFS Institutional Money Market Portfolio, Class A",
        "value": "1321086.24",
        "weight": "0.01606976",
        "shared": true
      },
      {
        "name": "WEST VIRGINIA ST",
        "value": "1307313.26",
        "weight": "0.01590223",
        "shared": false
      },
      {
        "name": "City of Wheeling, Series 2021 A",
        "value": "1292822.85",
        "weight": "0.01572596",
        "shared": false
      },
      {
        "name": "MARSHALL UNIV WV",
        "value": "1275144.75",
        "weight": "0.01551093",
        "shared": false
      },
      {
        "name": "Fairmont State University",
        "value": "1147380.26",
        "weight": "0.01395679",
        "shared": false
      },
      {
        "name": "West Virginia Economic Development Authority",
        "value": "1122344.16",
        "weight": "0.01365225",
        "shared": false
      },
      {
        "name": "West Virginia Economic Development Authority, Series 2023 A-1",
        "value": "1052288.60",
        "weight": "0.01280009",
        "shared": false
      },
      {
        "name": "W VIRGINIA ST H-SER B",
        "value": "1050204.00",
        "weight": "0.01277474",
        "shared": false
      },
      {
        "name": "Ohio County Commission, West Virginia, Special District Excise Tax Revenue Bonds, Fort Henry Economic Opportunity Development District-the Highlands P",
        "value": "1040270.40",
        "weight": "0.01265390",
        "shared": false
      },
      {
        "name": "WHEELING WV WTRWKS & SWR SYS R REGD B/E BAM 5.25000000",
        "value": "1032623.00",
        "weight": "0.01256088",
        "shared": false
      },
      {
        "name": "WEST VIRGINIA ST ECON DEV AUTH EXCESS LOTTERY REVENUE",
        "value": "1032026.30",
        "weight": "0.01255362",
        "shared": false
      },
      {
        "name": "West Virginia (State of) (Bidding Group 2), Series 2019 A, GO Bonds",
        "value": "1031739.80",
        "weight": "0.01255014",
        "shared": false
      },
      {
        "name": "West Virginia Lottery Excess Lottery",
        "value": "1023532.97",
        "weight": "0.01245031",
        "shared": false
      },
      {
        "name": "Berkeley County Board of Education",
        "value": "1018807.50",
        "weight": "0.01239283",
        "shared": false
      },
      {
        "name": "West Virginia Housing Development Fund",
        "value": "1015937.00",
        "weight": "0.01235791",
        "shared": false
      },
      {
        "name": "West Virginia Housing Development Fund, Series 2023D",
        "value": "1010208.00",
        "weight": "0.01228822",
        "shared": false
      },
      {
        "name": "WEST VIRGINIA ST HOSP FIN AUTH",
        "value": "1008583.80",
        "weight": "0.01226847",
        "shared": false
      },
      {
        "name": "West Virginia Housing Development Fund, Series 2023D",
        "value": "1005300.60",
        "weight": "0.01222853",
        "shared": false
      },
      {
        "name": "WEST VIRGINIA ST HSG DEV FUND",
        "value": "1005238.50",
        "weight": "0.01222777",
        "shared": false
      },
      {
        "name": "Wood County Board of Education, Series 2023",
        "value": "1002285.90",
        "weight": "0.01219186",
        "shared": false
      },
      {
        "name": "West Virginia Housing Development Fund, Series 2025A",
        "value": "1002200.00",
        "weight": "0.01219081",
        "shared": false
      },
      {
        "name": "WV HOSP FIN AUTH-A",
        "value": "1001238.70",
        "weight": "0.01217912",
        "shared": false
      },
      {
        "name": "West Virginia Housing Development Fund",
        "value": "1000731.00",
        "weight": "0.01217294",
        "shared": false
      },
      {
        "name": "West Virginia Hospital Finance Authority",
        "value": "1000514.20",
        "weight": "0.01217031",
        "shared": false
      },
      {
        "name": "West Virginia Housing Development Fund",
        "value": "997935.20",
        "weight": "0.01213894",
        "shared": false
      },
      {
        "name": "Ohio County, WV Commission TIF Rev. Refg. (Highlands)",
        "value": "974140.30",
        "weight": "0.01184949",
        "shared": false
      },
      {
        "name": "WEST VIRGINIA ST HSG DEV FUND",
        "value": "971398.10",
        "weight": "0.01181614",
        "shared": false
      },
      {
        "name": "Berkeley County Public Service Sewer District, Series 2025A",
        "value": "960435.50",
        "weight": "0.01168279",
        "shared": false
      },
      {
        "name": "WEST VIRGINIA ST HOSP FIN AUTH WVSMED 01/47 FIXED OID 4.125",
        "value": "959195.31",
        "weight": "0.01166770",
        "shared": false
      },
      {
        "name": "West Virginia Housing Development Fund, Series 2024D",
        "value": "957308.20",
        "weight": "0.01164475",
        "shared": false
      },
      {
        "name": "Berkeley County Public Service District, Series 2025 A",
        "value": "951506.20",
        "weight": "0.01157417",
        "shared": false
      },
      {
        "name": "Berkeley County Public Service Sewer District, Series 2025A",
        "value": "942223.00",
        "weight": "0.01146125",
        "shared": false
      },
      {
        "name": "Greenbrier Public Service District No. 1",
        "value": "932474.20",
        "weight": "0.01134266",
        "shared": false
      },
      {
        "name": "West Virginia Housing Development Fund",
        "value": "930202.40",
        "weight": "0.01131503",
        "shared": false
      },
      {
        "name": "W VA HOSP FIN AUTH-A",
        "value": "921078.60",
        "weight": "0.01120405",
        "shared": false
      },
      {
        "name": "WV PARKWAYS AUTH",
        "value": "914341.70",
        "weight": "0.01112210",
        "shared": false
      },
      {
        "name": "Monongalia County, West Virginia, Tax Increment Revenue Bonds, University Town Centre Development District 4, Senior Refunding and Improvement Series",
        "value": "911865.33",
        "weight": "0.01109198",
        "shared": false
      },
      {
        "name": "VIRGIN ISLANDS PUBLIC FIN AUTH VITGEN 10/32 FIXED 5",
        "value": "902643.93",
        "weight": "0.01097981",
        "shared": false
      },
      {
        "name": "NJ TRANSPRTN TRUST-AA",
        "value": "901912.40",
        "weight": "0.01097091",
        "shared": false
      },
      {
        "name": "West Virginia University",
        "value": "890986.16",
        "weight": "0.01083800",
        "shared": false
      },
      {
        "name": "MONONGALIA RV 4.125% 6/1/2043",
        "value": "838668.04",
        "weight": "0.01020160",
        "shared": false
      },
      {
        "name": "West Virginia Hospital Finance Authority",
        "value": "796087.96",
        "weight": "0.00968366",
        "shared": false
      },
      {
        "name": "Ohio County Commission, West Virginia, Special District Excise Tax Revenue Bonds, Fort Henry Economic Opportunity Development District-the Highlands P",
        "value": "789732.45",
        "weight": "0.00960635",
        "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": false
      },
      {
        "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": "0002071691-26-011432",
      "as_of": "2026-03-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/751656/000207169126011432/0002071691-26-011432-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"
    }
  ]
}