{
  "page": "compare",
  "query": {
    "a": "MPPAX",
    "b": "MFSMX"
  },
  "retrieved_at": "2026-07-07T15:44:21+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 Pennsylvania Municipal Bond Fund",
    "ticker": "MPPAX",
    "slug": "MPPAX",
    "series_id": "S000002524",
    "html_url": "https://fundwatcher.app/funds/MPPAX/"
  },
  "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": "0.07993320663990150700508286031",
    "coverage_b_by_a": "0.07993320663990150700508286034",
    "shared_count": 49,
    "as_of": {
      "a": "2026-03-31",
      "b": "2026-03-31"
    },
    "a_top": [
      {
        "name": "Indiana County Industrial Development Authority, Pennsylvania, Revenue Bonds, Foundation for Indiana University of Pennsylvania Project, Refunding Ser",
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      },
      {
        "name": "Southeastern Pennsylvania Transportation Authority, Revenue Bonds, Asset Improvement Series 2022",
        "value": "2082956.20",
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        "shared": false
      },
      {
        "name": "Pennsylvania State University (The), Series 2022A",
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      },
      {
        "name": "Philadelphia (City of), PA, Series 2025, RB",
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      },
      {
        "name": "Bucks County Water and Sewer Authority, Pennsylvania, Sewer System Revenue Bonds, Series 2022A",
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        "weight": "0.01039756",
        "shared": false
      },
      {
        "name": "MONTGOMERY HGR EDU-B",
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        "weight": "0.01000593",
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      },
      {
        "name": "PENNSYLVANIA ST HGR EDUCTNL FACS AUTH REVENUE",
        "value": "1777309.80",
        "weight": "0.00948698",
        "shared": false
      },
      {
        "name": "Chester County Health and Education Facilities Authority",
        "value": "1752424.63",
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      },
      {
        "name": "Pennsylvania Housing Finance Agency, Single Family Mortgage, Series 2026-152A",
        "value": "1679298.15",
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      },
      {
        "name": "MFS Institutional Money Market Portfolio, Class A",
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      },
      {
        "name": "INTER PA 458436 5.50% 8/15/2063",
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      },
      {
        "name": "Pennsylvania Housing Finance Agency",
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      {
        "name": "PHIL PA GAS/AGM 5.25% 8/1/54",
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      {
        "name": "ALLEG PA SWR 5% 12/1/2050",
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      },
      {
        "name": "BRISTOL TWP PA SCH DIST",
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      },
      {
        "name": "School District of Philadelphia (The), Series 2019A",
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      },
      {
        "name": "PENNSYLVANIA ST HSG FIN AGY SF MTGE REVENUE",
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      },
      {
        "name": "SCHOOL DISTRICT OF PHILADELPHIA THE",
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      },
      {
        "name": "WILKES-BARRE PA AREA SCH DIST",
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      },
      {
        "name": "PENNSYLVANIA ST HSG FIN AGY MF HSG REVENUE",
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      {
        "name": "Pennsylvania Housing Finance Agency, Series 2026, RB",
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      {
        "name": "Chester County School Authority, Series 2024",
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      {
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      },
      {
        "name": "Cheltenham Township School District, Series 2026",
        "value": "1427596.41",
        "weight": "0.00762027",
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      {
        "name": "Pittsburgh, Pennsylvania, General Obligation Bonds, Capital Improvement Series 2025",
        "value": "1384232.21",
        "weight": "0.00738880",
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      {
        "name": "TOWER HEALTH OBLIGATED GROUP 5.0% 06-30-39",
        "value": "1382905.29",
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      },
      {
        "name": "TEMPLE UNIV-REF-FIRST",
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      {
        "name": "Pennsylvania Turnpike Commission, Series 2019A",
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      {
        "name": "Moon Area School District, Series 2024 B",
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      {
        "name": "Chester (County of), PA Industrial Development Authority (University Student Housing, LLC at West Chester University of Pennsylvania)",
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      {
        "name": "WESTMORELAND PA 4% 7/1/2037",
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      {
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      {
        "name": "ST PUB SCH BLDG AUTH",
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      {
        "name": "PENNSYLVANIA ST ECON DEV FINGA REGD OID B/E AG 4.00000000",
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      },
      {
        "name": "NYC TRANSITIONAL FIN",
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        "shared": true
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      {
        "name": "PENNSYLVANIA ST HSG FIN AGY SF REGD B/E 5.50000000",
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      {
        "name": "William Penn School District Authority, Series 2025A",
        "value": "1181564.64",
        "weight": "0.00630699",
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      {
        "name": "Pennsylvania Higher Education Assistance Agency, Education Loan Revenue Bonds, Senior Series 2022A",
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        "weight": "0.00615063",
        "shared": false
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      {
        "name": "PENNSYLVANIA ST HSG FIN AGY SF REGD B/E 5.75000000",
        "value": "1136331.98",
        "weight": "0.00606555",
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      },
      {
        "name": "Clemson University",
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        "weight": "0.00593109",
        "shared": false
      },
      {
        "name": "PENNSYLVANIA ST ECON DEV FING AUTH SOLID WASTE DISPOSAL REV",
        "value": "1104580.50",
        "weight": "0.00589607",
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      },
      {
        "name": "BETHEL PK SD",
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        "weight": "0.00572763",
        "shared": false
      },
      {
        "name": "PENNSYLVANIA ST HGR EDUCTNL FA REGD B/E 5.50000000",
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        "weight": "0.00566612",
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      },
      {
        "name": "PHIL PA WTR/AGM 5.5% 9/1/53",
        "value": "1058568.10",
        "weight": "0.00565046",
        "shared": false
      },
      {
        "name": "Pennsylvania Turnpike Commission, Series 2025B",
        "value": "1056660.00",
        "weight": "0.00564027",
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      },
      {
        "name": "BETHLEHEM ASD",
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      {
        "name": "Pennsylvania Turnpike Commission, Series 2025 A",
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      {
        "name": "ALLEG PA ARPT 5.50% 1/1/2050 @",
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        "shared": false
      },
      {
        "name": "PENNSBURY SD",
        "value": "1045499.20",
        "weight": "0.00558070",
        "shared": false
      },
      {
        "name": "PENNSYLVANIA ST HGR EDUCTNL FA REGD B/E AG 5.25000000",
        "value": "1044490.80",
        "weight": "0.00557532",
        "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",
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      {
        "name": "Montgomery (County of), MD, Series 2017, GO Bonds",
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        "shared": false
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      {
        "name": "MARYLAND ST STD 5% 5/1/2035",
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      },
      {
        "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",
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        "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",
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      },
      {
        "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
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      {
        "name": "County of Howard",
        "value": "1424096.70",
        "weight": "0.00915007",
        "shared": false
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      {
        "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": true
      },
      {
        "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": "0002071691-26-011421",
      "as_of": "2026-03-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/751656/000207169126011421/0002071691-26-011421-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"
    }
  ]
}