{
  "page": "compare",
  "query": {
    "a": "MPVOX",
    "b": "MFSSX"
  },
  "retrieved_at": "2026-07-07T18:27:17+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": "MPVOX",
    "slug": "MPVOX",
    "series_id": "S000002527",
    "html_url": "https://fundwatcher.app/funds/MPVOX/"
  },
  "fund_b": {
    "name": "MFS Massachusetts Municipal Bond Fund",
    "ticker": "MFSSX",
    "slug": "MFSSX",
    "series_id": "S000002534",
    "html_url": "https://fundwatcher.app/funds/MFSSX/"
  },
  "overlap": {
    "coverage_a_by_b": "0.09481131646267980129886893891",
    "coverage_b_by_a": "0.09481131646267980129886893890",
    "shared_count": 51,
    "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": false
      },
      {
        "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": false
      },
      {
        "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": false
      },
      {
        "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": false
      },
      {
        "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": "6780076.38",
        "weight": "0.01677377",
        "shared": true
      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY R REGD B/E 5.00000000",
        "value": "5519077.50",
        "weight": "0.01365409",
        "shared": false
      },
      {
        "name": "Commonwealth of Massachusetts Transportation Fund, Series 2025A",
        "value": "5246705.50",
        "weight": "0.01298024",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY REVENUE",
        "value": "5015128.50",
        "weight": "0.01240733",
        "shared": false
      },
      {
        "name": "MA CLEAN WTR TRUST-27",
        "value": "4238510.00",
        "weight": "0.01048599",
        "shared": false
      },
      {
        "name": "MBTA SLS TAX 5.25% 7/1/55",
        "value": "4197145.60",
        "weight": "0.01038365",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST",
        "value": "4174933.60",
        "weight": "0.01032870",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST SCH BLDG AUTH SALES TAX REVENUE",
        "value": "4156830.40",
        "weight": "0.01028392",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST SCH BLDG AUTH SALES TAX REVENUE",
        "value": "4139378.40",
        "weight": "0.01024074",
        "shared": false
      },
      {
        "name": "MA ST TRANS REV 5% 6/1/2053",
        "value": "4128929.20",
        "weight": "0.01021489",
        "shared": false
      },
      {
        "name": "Tri-County Regional Vocational Technical School District, Series CHAPTER 70B",
        "value": "3897596.00",
        "weight": "0.00964257",
        "shared": false
      },
      {
        "name": "MASS DEVEL FIN 4% 10/1/2045",
        "value": "3683306.52",
        "weight": "0.00911243",
        "shared": false
      },
      {
        "name": "PUERTO RICO SALES TAX FING COR REGD OID B/E 5.00000000",
        "value": "3618162.86",
        "weight": "0.00895126",
        "shared": true
      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY REVENUE",
        "value": "3613758.75",
        "weight": "0.00894037",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST PORT AUTH",
        "value": "3600171.84",
        "weight": "0.00890675",
        "shared": false
      },
      {
        "name": "Massachusetts Development Finance Agency, Series 2025W",
        "value": "3580581.24",
        "weight": "0.00885829",
        "shared": false
      },
      {
        "name": "Town of Tisbury",
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        "weight": "0.00884740",
        "shared": false
      },
      {
        "name": "Massachusetts Housing Finance Agency",
        "value": "3515743.88",
        "weight": "0.00869788",
        "shared": false
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      {
        "name": "Massachusetts Bay Transportation Authority, Series 2025 B",
        "value": "3220527.00",
        "weight": "0.00796752",
        "shared": false
      },
      {
        "name": "Massachusetts Educational Financing Authority",
        "value": "3190051.60",
        "weight": "0.00789212",
        "shared": false
      },
      {
        "name": "WAKEFIELD MA REGD B/E 5.00000000",
        "value": "3159303.90",
        "weight": "0.00781605",
        "shared": false
      },
      {
        "name": "Massachusetts Development Finance Agency",
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        "weight": "0.00776002",
        "shared": false
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      {
        "name": "MASSACHUSETTS ST DEV FIN AGY REVENUE",
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      },
      {
        "name": "MA ST TRANS REV 5% 6/1/2049",
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        "weight": "0.00770044",
        "shared": false
      },
      {
        "name": "MASS DEVEL FIN 5% 7/1/2048",
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        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST PORT AUTH REGD B/E AMT 5.00000000",
        "value": "3065727.02",
        "weight": "0.00758455",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST",
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        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST PORT AUTH",
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      },
      {
        "name": "MASSACHUSETTS ST TRANSPRTN FUND REVENUE",
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        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY R REGD B/E 5.50000000",
        "value": "3048717.60",
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        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY R REGD B/E 5.00000000",
        "value": "3037816.50",
        "weight": "0.00751550",
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      },
      {
        "name": "Massachusetts Housing Finance Agency",
        "value": "3031967.70",
        "weight": "0.00750103",
        "shared": false
      },
      {
        "name": "Massachusetts Port Authority, Revenue Bonds, Refunding Series 2017A",
        "value": "3019395.90",
        "weight": "0.00746992",
        "shared": false
      },
      {
        "name": "Massachusetts (Commonwealth of), Series 2024 E, GO Bonds",
        "value": "3013826.13",
        "weight": "0.00745615",
        "shared": false
      },
      {
        "name": "Massachusetts Housing Finance Agency, Series 2013B",
        "value": "3000481.50",
        "weight": "0.00742313",
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      {
        "name": "Massachusetts Housing Finance Agency, Series 249",
        "value": "2982815.10",
        "weight": "0.00737942",
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      },
      {
        "name": "S E ENERGY COOP DT",
        "value": "2925100.78",
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        "shared": false
      },
      {
        "name": "MA ST DEV FIN -J2",
        "value": "2888537.40",
        "weight": "0.00714618",
        "shared": false
      },
      {
        "name": "Nashoba Regional School District",
        "value": "2882022.33",
        "weight": "0.00713007",
        "shared": false
      },
      {
        "name": "Commonwealth of Massachusetts Transportation Fund Revenue",
        "value": "2859262.50",
        "weight": "0.00707376",
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      },
      {
        "name": "Massachusetts Development Finance Agency 4.00% 07/01/2039",
        "value": "2848928.03",
        "weight": "0.00704819",
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      },
      {
        "name": "MASSACHUSETTS ST PORT AUTH",
        "value": "2832906.44",
        "weight": "0.00700855",
        "shared": false
      },
      {
        "name": "Town of Hingham, Series 2025",
        "value": "2813363.75",
        "weight": "0.00696021",
        "shared": false
      },
      {
        "name": "NEW BEDFORD MA",
        "value": "2771977.80",
        "weight": "0.00685782",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY REVENUE",
        "value": "2770168.63",
        "weight": "0.00685334",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY REVENUE",
        "value": "2721192.71",
        "weight": "0.00673218",
        "shared": false
      },
      {
        "name": "MA ST DEV FIN AGY-N",
        "value": "2709922.68",
        "weight": "0.00670429",
        "shared": false
      },
      {
        "name": "Massachusetts Housing Finance Agency, Single Family Housing Revenue Bonds, Social Series 2024-234",
        "value": "2705206.90",
        "weight": "0.00669263",
        "shared": false
      },
      {
        "name": "Massachusetts Development Finance Agency",
        "value": "2624785.64",
        "weight": "0.00649367",
        "shared": false
      },
      {
        "name": "CALIFORNIA ST HLTH FACS FING AUTH REVENUE",
        "value": "2485529.50",
        "weight": "0.00614915",
        "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": "0002071691-26-011422",
      "as_of": "2026-03-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/751656/000207169126011422/0002071691-26-011422-index.htm"
    }
  ]
}