{
  "page": "compare",
  "query": {
    "a": "MBMSX",
    "b": "DUMSX"
  },
  "retrieved_at": "2026-07-07T19:04:29+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": "MBMSX",
    "slug": "MBMSX",
    "series_id": "S000002535",
    "html_url": "https://fundwatcher.app/funds/MBMSX/"
  },
  "fund_b": {
    "name": "Mississippi Tax-Free Income Series",
    "ticker": "DUMSX",
    "slug": "DUMSX",
    "series_id": "S000012001",
    "html_url": "https://fundwatcher.app/funds/DUMSX/"
  },
  "overlap": {
    "coverage_a_by_b": "0.1123851953749235534477050066",
    "coverage_b_by_a": "0.1123851953749235534477050067",
    "shared_count": 9,
    "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": true
      },
      {
        "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": false
      },
      {
        "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": true
      },
      {
        "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": true
      },
      {
        "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": true
      },
      {
        "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": true
      },
      {
        "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": true
      },
      {
        "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": true
      },
      {
        "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": false
      },
      {
        "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": "MS MSSSFH 4.4 12/01/2043",
        "value": "343238.00",
        "weight": "0.08673772",
        "shared": false
      },
      {
        "name": "MS CANEDU 5.25 01/01/2045",
        "value": "307955.00",
        "weight": "0.07782155",
        "shared": true
      },
      {
        "name": "MS MSSDEV 4 12/01/2034",
        "value": "300987.00",
        "weight": "0.07606071",
        "shared": false
      },
      {
        "name": "MS MSSDEV 5 07/01/2048",
        "value": "246171.10",
        "weight": "0.06220850",
        "shared": true
      },
      {
        "name": "MS MSSDEV 4 06/01/2044",
        "value": "215169.75",
        "weight": "0.05437432",
        "shared": true
      },
      {
        "name": "MS MSSDEV 5 06/01/2037",
        "value": "208666.00",
        "weight": "0.05273080",
        "shared": false
      },
      {
        "name": "MS MSSDEV 5 08/01/2027",
        "value": "206136.00",
        "weight": "0.05209145",
        "shared": false
      },
      {
        "name": "MS MSSDEV 4 08/01/2034",
        "value": "200128.00",
        "weight": "0.05057321",
        "shared": false
      },
      {
        "name": "MS MDCEDU 5 06/01/2042",
        "value": "167135.10",
        "weight": "0.04223576",
        "shared": true
      },
      {
        "name": "MS PEA 4.75 09/01/2038",
        "value": "164743.30",
        "weight": "0.04163134",
        "shared": true
      },
      {
        "name": "MS MSSSFH 4.38 12/01/2044",
        "value": "146161.50",
        "weight": "0.03693564",
        "shared": false
      },
      {
        "name": "MS MSSSFH 4.05 12/01/2047",
        "value": "134754.00",
        "weight": "0.03405292",
        "shared": true
      },
      {
        "name": "University of Mississippi Educational Building Corp., Series 2017 , Ref. RB",
        "value": "120592.50",
        "weight": "0.03047424",
        "shared": true
      },
      {
        "name": "MS WAR 6 09/01/2042",
        "value": "113546.00",
        "weight": "0.02869356",
        "shared": false
      },
      {
        "name": "MS WAR 6 09/01/2043",
        "value": "112859.00",
        "weight": "0.02851995",
        "shared": false
      },
      {
        "name": "MS MSSDEV 5.5 03/01/2038",
        "value": "105411.00",
        "weight": "0.02663781",
        "shared": false
      },
      {
        "name": "MS MSSDEV 5 06/01/2040",
        "value": "103876.00",
        "weight": "0.02624991",
        "shared": false
      },
      {
        "name": "State of Mississippi, Series 2024",
        "value": "102012.00",
        "weight": "0.02577887",
        "shared": true
      },
      {
        "name": "MS UMSHGR 4 10/01/2037",
        "value": "101027.00",
        "weight": "0.02552996",
        "shared": false
      },
      {
        "name": "MS ALCHGR 4 09/01/2035",
        "value": "100143.00",
        "weight": "0.02530657",
        "shared": false
      },
      {
        "name": "MS MSSDEV 4 03/01/2037",
        "value": "99560.00",
        "weight": "0.02515924",
        "shared": false
      },
      {
        "name": "MS MSSDEV 4 04/01/2039",
        "value": "99299.00",
        "weight": "0.02509328",
        "shared": false
      },
      {
        "name": "State of Mississippi, Series 2024",
        "value": "93431.00",
        "weight": "0.02361042",
        "shared": true
      },
      {
        "name": "MS MSSDEV 4 06/01/2033",
        "value": "90434.70",
        "weight": "0.02285324",
        "shared": false
      },
      {
        "name": "MISSISSIPPI DEV BK SPL OBLIG MSSDEV 03/44 FIXED 5",
        "value": "73758.30",
        "weight": "0.01863904",
        "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": "0001193125-26-163209",
      "as_of": "2026-03-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/311101/000119312526163209/0001193125-26-163209-index.htm"
    }
  ]
}