{
  "page": "compare",
  "query": {
    "a": "MPMSX",
    "b": "MFPAX"
  },
  "retrieved_at": "2026-07-07T19:26:42+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 Mississippi Municipal Bond Fund",
    "ticker": "MPMSX",
    "slug": "MPMSX",
    "series_id": "S000002535",
    "html_url": "https://fundwatcher.app/funds/MPMSX/"
  },
  "fund_b": {
    "name": "MFS Pennsylvania Municipal Bond Fund",
    "ticker": "MFPAX",
    "slug": "MFPAX",
    "series_id": "S000002524",
    "html_url": "https://fundwatcher.app/funds/MFPAX/"
  },
  "overlap": {
    "coverage_a_by_b": "0.06398946532475207892320756140",
    "coverage_b_by_a": "0.06398946532475207892320756139",
    "shared_count": 41,
    "as_of": {
      "a": "2026-03-31",
      "b": "2026-03-31"
    },
    "a_top": [
      {
        "name": "Jackson County Utility Authority",
        "value": "2000631.40",
        "weight": "0.03277370",
        "shared": false
      },
      {
        "name": "Mississippi Home Corp., Series 2024A",
        "value": "1688631.00",
        "weight": "0.02766261",
        "shared": false
      },
      {
        "name": "Mississippi Development Bank",
        "value": "1325279.25",
        "weight": "0.02171030",
        "shared": false
      },
      {
        "name": "MS MDCEDU 5 06/01/2042",
        "value": "1261411.13",
        "weight": "0.02066403",
        "shared": false
      },
      {
        "name": "Medical Center Educational Building Corp.",
        "value": "1254090.13",
        "weight": "0.02054410",
        "shared": false
      },
      {
        "name": "MS DEV BK 5.25% 1/1/2034",
        "value": "1110241.00",
        "weight": "0.01818761",
        "shared": false
      },
      {
        "name": "W RANKIN UTIL AUTH",
        "value": "1042610.40",
        "weight": "0.01707971",
        "shared": false
      },
      {
        "name": "Mississippi Development Bank, Series 2025",
        "value": "1037956.10",
        "weight": "0.01700346",
        "shared": false
      },
      {
        "name": "Mississippi Development Bank",
        "value": "1034851.30",
        "weight": "0.01695260",
        "shared": false
      },
      {
        "name": "Mississippi Development Bank",
        "value": "1034582.33",
        "weight": "0.01694819",
        "shared": false
      },
      {
        "name": "PUERTO RICO SALES TAX FING COR REGD OID B/E 5.00000000",
        "value": "1032402.75",
        "weight": "0.01691249",
        "shared": true
      },
      {
        "name": "Mississippi Development Bank, Series 2024",
        "value": "1021683.20",
        "weight": "0.01673688",
        "shared": false
      },
      {
        "name": "State of Mississippi, Series 2024",
        "value": "1020528.20",
        "weight": "0.01671796",
        "shared": false
      },
      {
        "name": "State of Mississippi, Series 2018A",
        "value": "1014675.70",
        "weight": "0.01662209",
        "shared": false
      },
      {
        "name": "Mississippi Development Bank",
        "value": "1006948.90",
        "weight": "0.01649551",
        "shared": false
      },
      {
        "name": "MS MSSDEV 5 07/01/2048",
        "value": "1003922.30",
        "weight": "0.01644593",
        "shared": false
      },
      {
        "name": "MISSISSIPPI ST HOME CORP SF MTGE REVENUE",
        "value": "989126.70",
        "weight": "0.01620355",
        "shared": false
      },
      {
        "name": "Mississippi Development Bank",
        "value": "972746.80",
        "weight": "0.01593522",
        "shared": false
      },
      {
        "name": "Mississippi Home Corp.",
        "value": "955213.90",
        "weight": "0.01564801",
        "shared": false
      },
      {
        "name": "MS HOSP 4% 1/1/2040",
        "value": "954595.70",
        "weight": "0.01563788",
        "shared": false
      },
      {
        "name": "Medical Center Educational Building Corp., Series 2017, Ref. RB",
        "value": "913079.10",
        "weight": "0.01495777",
        "shared": false
      },
      {
        "name": "MS MSSSFH 4.05 12/01/2047",
        "value": "909184.20",
        "weight": "0.01489396",
        "shared": false
      },
      {
        "name": "Medical Center Educational Building Corp., Series 2023, RB",
        "value": "889611.30",
        "weight": "0.01457333",
        "shared": false
      },
      {
        "name": "Mississippi Home Corp.",
        "value": "822064.50",
        "weight": "0.01346680",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST BAY TRANSPRTN AUTH SALES TAX REVENUE",
        "value": "815068.05",
        "weight": "0.01335218",
        "shared": false
      },
      {
        "name": "Warren County, Mississippi, Certificates of Participation, Lease Purchase Jail Project Series 2023",
        "value": "806926.35",
        "weight": "0.01321881",
        "shared": false
      },
      {
        "name": "Warren County, Mississippi, Certificates of Participation, Lease Purchase Jail Project Series 2023",
        "value": "797703.15",
        "weight": "0.01306772",
        "shared": false
      },
      {
        "name": "Mississippi Development Bank, Series 2024",
        "value": "765382.50",
        "weight": "0.01253825",
        "shared": false
      },
      {
        "name": "MS DEV BK SPL/AGM 6.88% 12/1/40",
        "value": "763027.50",
        "weight": "0.01249967",
        "shared": false
      },
      {
        "name": "MS UNIV EDU CORP-A",
        "value": "761849.03",
        "weight": "0.01248037",
        "shared": false
      },
      {
        "name": "MS ST HOME SF 4.8% 12/1/45",
        "value": "754596.08",
        "weight": "0.01236155",
        "shared": false
      },
      {
        "name": "MISSISSIPPI ST HOME CORP SF MT REGD B/E GNMA/FN 4.80000000",
        "value": "749706.98",
        "weight": "0.01228146",
        "shared": false
      },
      {
        "name": "San Diego Unified School District, Series 2010C",
        "value": "747424.99",
        "weight": "0.01224408",
        "shared": false
      },
      {
        "name": "Mississippi Home Corp., Series 2024 C",
        "value": "747109.80",
        "weight": "0.01223891",
        "shared": false
      },
      {
        "name": "Mississippi Home Corp., Series 2024 E",
        "value": "742496.25",
        "weight": "0.01216333",
        "shared": false
      },
      {
        "name": "MS MHSG 4.55% 4/1/2042",
        "value": "736179.50",
        "weight": "0.01205986",
        "shared": false
      },
      {
        "name": "MS MSSDEV 4 06/01/2044",
        "value": "719826.08",
        "weight": "0.01179196",
        "shared": false
      },
      {
        "name": "State of Mississippi",
        "value": "714285.34",
        "weight": "0.01170119",
        "shared": false
      },
      {
        "name": "Mississippi Development Bank",
        "value": "700880.10",
        "weight": "0.01148159",
        "shared": false
      },
      {
        "name": "State of Mississippi, Series 2024",
        "value": "698163.60",
        "weight": "0.01143709",
        "shared": false
      },
      {
        "name": "Mississippi State University Educational Building Corp., Series 2024A",
        "value": "662858.63",
        "weight": "0.01085874",
        "shared": false
      },
      {
        "name": "S E ENERGY COOP DT",
        "value": "602226.63",
        "weight": "0.00986548",
        "shared": false
      },
      {
        "name": "University of Mississippi Educational Building Corp., Series 2017 , Ref. RB",
        "value": "583536.60",
        "weight": "0.00955931",
        "shared": false
      },
      {
        "name": "Mississippi Home Corp., Series 2026A",
        "value": "527590.00",
        "weight": "0.00864281",
        "shared": false
      },
      {
        "name": "MFS Institutional Money Market Portfolio, Class A",
        "value": "526050.32",
        "weight": "0.00861759",
        "shared": true
      },
      {
        "name": "Little Rock School District",
        "value": "524720.56",
        "weight": "0.00859580",
        "shared": false
      },
      {
        "name": "Mississippi Development Bank, Series 2025",
        "value": "523145.20",
        "weight": "0.00857000",
        "shared": false
      },
      {
        "name": "WARREN CO-A-REF-REMK",
        "value": "515369.10",
        "weight": "0.00844261",
        "shared": false
      },
      {
        "name": "Mississippi Development Bank, Special Obligation Bonds, Lamar County School District Series 2025",
        "value": "511065.05",
        "weight": "0.00837210",
        "shared": false
      },
      {
        "name": "Mississippi Development Bank, Series 2025",
        "value": "511065.05",
        "weight": "0.00837210",
        "shared": false
      }
    ],
    "b_top": [
      {
        "name": "Indiana County Industrial Development Authority, Pennsylvania, Revenue Bonds, Foundation for Indiana University of Pennsylvania Project, Refunding Ser",
        "value": "2413610.65",
        "weight": "0.01288345",
        "shared": false
      },
      {
        "name": "Southeastern Pennsylvania Transportation Authority, Revenue Bonds, Asset Improvement Series 2022",
        "value": "2082956.20",
        "weight": "0.01111847",
        "shared": false
      },
      {
        "name": "Pennsylvania State University (The), Series 2022A",
        "value": "2078336.40",
        "weight": "0.01109381",
        "shared": false
      },
      {
        "name": "Philadelphia (City of), PA, Series 2025, RB",
        "value": "1990399.20",
        "weight": "0.01062442",
        "shared": false
      },
      {
        "name": "Bucks County Water and Sewer Authority, Pennsylvania, Sewer System Revenue Bonds, Series 2022A",
        "value": "1947899.00",
        "weight": "0.01039756",
        "shared": false
      },
      {
        "name": "MONTGOMERY HGR EDU-B",
        "value": "1874530.00",
        "weight": "0.01000593",
        "shared": false
      },
      {
        "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",
        "weight": "0.00935415",
        "shared": false
      },
      {
        "name": "Pennsylvania Housing Finance Agency, Single Family Mortgage, Series 2026-152A",
        "value": "1679298.15",
        "weight": "0.00896381",
        "shared": false
      },
      {
        "name": "MFS Institutional Money Market Portfolio, Class A",
        "value": "1629586.76",
        "weight": "0.00869846",
        "shared": true
      },
      {
        "name": "INTER PA 458436 5.50% 8/15/2063",
        "value": "1584024.60",
        "weight": "0.00845526",
        "shared": false
      },
      {
        "name": "Pennsylvania Housing Finance Agency",
        "value": "1562433.78",
        "weight": "0.00834001",
        "shared": false
      },
      {
        "name": "PHIL PA GAS/AGM 5.25% 8/1/54",
        "value": "1559163.00",
        "weight": "0.00832255",
        "shared": false
      },
      {
        "name": "ALLEG PA SWR 5% 12/1/2050",
        "value": "1544385.15",
        "weight": "0.00824367",
        "shared": false
      },
      {
        "name": "BRISTOL TWP PA SCH DIST",
        "value": "1544311.35",
        "weight": "0.00824328",
        "shared": false
      },
      {
        "name": "School District of Philadelphia (The), Series 2019A",
        "value": "1536595.65",
        "weight": "0.00820209",
        "shared": false
      },
      {
        "name": "PENNSYLVANIA ST HSG FIN AGY SF MTGE REVENUE",
        "value": "1529455.35",
        "weight": "0.00816398",
        "shared": false
      },
      {
        "name": "SCHOOL DISTRICT OF PHILADELPHIA THE",
        "value": "1503900.63",
        "weight": "0.00802757",
        "shared": false
      },
      {
        "name": "WILKES-BARRE PA AREA SCH DIST",
        "value": "1502367.45",
        "weight": "0.00801939",
        "shared": false
      },
      {
        "name": "PENNSYLVANIA ST HSG FIN AGY MF HSG REVENUE",
        "value": "1498730.06",
        "weight": "0.00799997",
        "shared": false
      },
      {
        "name": "Pennsylvania Housing Finance Agency, Series 2026, RB",
        "value": "1465146.60",
        "weight": "0.00782071",
        "shared": false
      },
      {
        "name": "Chester County School Authority, Series 2024",
        "value": "1445785.00",
        "weight": "0.00771736",
        "shared": false
      },
      {
        "name": "PENNSYLVANIA ST HSG FIN AGY SF REGD B/E 6.00000000",
        "value": "1435138.62",
        "weight": "0.00766053",
        "shared": false
      },
      {
        "name": "Cheltenham Township School District, Series 2026",
        "value": "1427596.41",
        "weight": "0.00762027",
        "shared": false
      },
      {
        "name": "Pittsburgh, Pennsylvania, General Obligation Bonds, Capital Improvement Series 2025",
        "value": "1384232.21",
        "weight": "0.00738880",
        "shared": false
      },
      {
        "name": "TOWER HEALTH OBLIGATED GROUP 5.0% 06-30-39",
        "value": "1382905.29",
        "weight": "0.00738172",
        "shared": false
      },
      {
        "name": "TEMPLE UNIV-REF-FIRST",
        "value": "1359456.63",
        "weight": "0.00725655",
        "shared": false
      },
      {
        "name": "Pennsylvania Turnpike Commission, Series 2019A",
        "value": "1357363.80",
        "weight": "0.00724538",
        "shared": false
      },
      {
        "name": "Moon Area School District, Series 2024 B",
        "value": "1353832.95",
        "weight": "0.00722653",
        "shared": false
      },
      {
        "name": "Chester (County of), PA Industrial Development Authority (University Student Housing, LLC at West Chester University of Pennsylvania)",
        "value": "1325226.60",
        "weight": "0.00707384",
        "shared": false
      },
      {
        "name": "WESTMORELAND PA 4% 7/1/2037",
        "value": "1322004.32",
        "weight": "0.00705664",
        "shared": false
      },
      {
        "name": "Philadelphia (City of), PA Authority for Industrial Development (University Square Apartments), Series 2017, RB",
        "value": "1267249.88",
        "weight": "0.00676437",
        "shared": false
      },
      {
        "name": "ST PUB SCH BLDG AUTH",
        "value": "1265697.48",
        "weight": "0.00675608",
        "shared": false
      },
      {
        "name": "PENNSYLVANIA ST ECON DEV FINGA REGD OID B/E AG 4.00000000",
        "value": "1263748.07",
        "weight": "0.00674568",
        "shared": false
      },
      {
        "name": "NYC TRANSITIONAL FIN",
        "value": "1251765.11",
        "weight": "0.00668171",
        "shared": false
      },
      {
        "name": "PENNSYLVANIA ST HSG FIN AGY SF REGD B/E 5.50000000",
        "value": "1232528.19",
        "weight": "0.00657903",
        "shared": false
      },
      {
        "name": "William Penn School District Authority, Series 2025A",
        "value": "1181564.64",
        "weight": "0.00630699",
        "shared": false
      },
      {
        "name": "Pennsylvania Higher Education Assistance Agency, Education Loan Revenue Bonds, Senior Series 2022A",
        "value": "1152271.20",
        "weight": "0.00615063",
        "shared": false
      },
      {
        "name": "PENNSYLVANIA ST HSG FIN AGY SF REGD B/E 5.75000000",
        "value": "1136331.98",
        "weight": "0.00606555",
        "shared": false
      },
      {
        "name": "Clemson University",
        "value": "1111141.05",
        "weight": "0.00593109",
        "shared": false
      },
      {
        "name": "PENNSYLVANIA ST ECON DEV FING AUTH SOLID WASTE DISPOSAL REV",
        "value": "1104580.50",
        "weight": "0.00589607",
        "shared": false
      },
      {
        "name": "BETHEL PK SD",
        "value": "1073026.20",
        "weight": "0.00572763",
        "shared": false
      },
      {
        "name": "PENNSYLVANIA ST HGR EDUCTNL FA REGD B/E 5.50000000",
        "value": "1061502.30",
        "weight": "0.00566612",
        "shared": false
      },
      {
        "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",
        "shared": false
      },
      {
        "name": "BETHLEHEM ASD",
        "value": "1054348.00",
        "weight": "0.00562793",
        "shared": false
      },
      {
        "name": "Pennsylvania Turnpike Commission, Series 2025 A",
        "value": "1049117.20",
        "weight": "0.00560001",
        "shared": false
      },
      {
        "name": "ALLEG PA ARPT 5.50% 1/1/2050 @",
        "value": "1048712.60",
        "weight": "0.00559785",
        "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
      }
    ]
  },
  "error": null,
  "sources": [
    {
      "label": "N-PORT (fund A)",
      "accession_no": "0002071691-26-011431",
      "as_of": "2026-03-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/751656/000207169126011431/0002071691-26-011431-index.htm"
    },
    {
      "label": "N-PORT (fund B)",
      "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"
    }
  ]
}