{
  "page": "compare",
  "query": {
    "a": "MMIIX",
    "b": "ABTHX"
  },
  "retrieved_at": "2026-07-07T18:27:20+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 Municipal High Income Fund",
    "ticker": "MMIIX",
    "slug": "MMIIX",
    "series_id": "S000002429",
    "html_url": "https://fundwatcher.app/funds/MMIIX/"
  },
  "fund_b": {
    "name": "AB High Income Municipal Portfolio",
    "ticker": "ABTHX",
    "slug": "ABTHX",
    "series_id": "S000027380",
    "html_url": "https://fundwatcher.app/funds/ABTHX/"
  },
  "overlap": {
    "coverage_a_by_b": "0.09972722044380965377629791722",
    "coverage_b_by_a": "0.09972722044380965377629791722",
    "shared_count": 151,
    "as_of": {
      "a": "2026-04-30",
      "b": "2026-02-28"
    },
    "a_top": [
      {
        "name": "MFS Institutional Money Market Portfolio, Class A",
        "value": "128182109.40",
        "weight": "0.02402789",
        "shared": false
      },
      {
        "name": "PUERTO RICO SALES TAX FING COR REGD OID B/E 5.00000000",
        "value": "99980308.87",
        "weight": "0.01874142",
        "shared": true
      },
      {
        "name": "TOWER HEALTH OBLIGATED GROUP 5.0% 06-30-39",
        "value": "31778309.80",
        "weight": "0.00595688",
        "shared": false
      },
      {
        "name": "OH BUCGEN 5 06/01/2055",
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        "weight": "0.00583312",
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      },
      {
        "name": "California (State of) Community Choice Financing Authority (Green Bonds), Series 2023 C, RB",
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        "weight": "0.00505950",
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      },
      {
        "name": "NY TRANS CORP(JFK INT NEW ONE)/AGM 5.13% 6/30/60@",
        "value": "24716563.99",
        "weight": "0.00463315",
        "shared": false
      },
      {
        "name": "New Hampshire Business Finance Authority, Series 2023A",
        "value": "24287021.38",
        "weight": "0.00455263",
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      },
      {
        "name": "City of Chicago, Series 2021A",
        "value": "24079941.62",
        "weight": "0.00451381",
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      },
      {
        "name": "NY TRANS CORP(JFK INT NEW ONE)/AGM 5.25% 6/30/60@",
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      },
      {
        "name": "TOBACCO SETTLEMENT-B2",
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      },
      {
        "name": "NOVANT HEALTH OBLIGATED GROUP 5.5% 06-01-50",
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        "weight": "0.00382398",
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      },
      {
        "name": "CHICAGO ILLIN 6% 4/1/2046",
        "value": "20086288.15",
        "weight": "0.00376520",
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      },
      {
        "name": "PENNSYLVANIA ST ECON DEV FING REGD OID B/E AMT AG 5.00000000",
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        "weight": "0.00352204",
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      },
      {
        "name": "AL BBEUTL 5 06/01/2036",
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      },
      {
        "name": "NY TRANSPRTN DEV CORP",
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      },
      {
        "name": "NY NYCDEV 5 11/15/2044",
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      },
      {
        "name": "Wisconsin (State of) Public Finance Authority, Series 2012 B, Ref. RB",
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      {
        "name": "MOHEG CT 608327 7.00% 2/1/2045",
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      },
      {
        "name": "FL ST DFC 5% 7/1/2044 @",
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      },
      {
        "name": "Palm Beach County, Florida, Revenue Bonds, Provident Group - LU Properties LLC Lynn University Housing Project, Series 2021A",
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      {
        "name": "Port of Beaumont Navigation District, Series 2024B",
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      {
        "name": "JEA WTR & SWR REV-A",
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      {
        "name": "Wisconsin (State of) Public Finance Authority (American Dream at Meadowlands), Series 2017, RB",
        "value": "16136650.00",
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      {
        "name": "PROJECTNEW YORK TRANS",
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      {
        "name": "Alachua County Health Facilities Authority, Series 2025 A",
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      {
        "name": "Michigan State Housing Development Authority, Series 2024A",
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      {
        "name": "New Hampshire Health and Education Facilities Authority Act, Series 2024",
        "value": "15349826.88",
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      {
        "name": "GOLDEN ST TOBACCO SEC",
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      {
        "name": "Jefferson (County of), AL, Series 2024, Ref. Revenue Wts.",
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      {
        "name": "Energy Southeast A Cooperative District, Series B-1",
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      {
        "name": "TENNERGY CORP TN GAS REVENUE TGYPWR 10/53 ADJUSTABLE VAR",
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        "weight": "0.00273596",
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      {
        "name": "MONT PA IDA 5.375% 1/1/2050",
        "value": "14463406.15",
        "weight": "0.00271118",
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      },
      {
        "name": "TARRANT RETIRE 5.75% 12/1/2054",
        "value": "14317449.62",
        "weight": "0.00268382",
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      {
        "name": "OU MEDICINE OBLIGATED GROUP 5.5% 08-15-57",
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      {
        "name": "New Hampshire Business Finance Authority, Series 2024A",
        "value": "13899326.60",
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      {
        "name": "Louisiana (State of) Public Facilities Authority (I-10 Calcasieu River Bridge), Series 2024, RB",
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      {
        "name": "IL CHIEDU 5 12/01/2042",
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      {
        "name": "SHELL POINT OBLIGATED GROUP 5.0% 11-15-54",
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      },
      {
        "name": "METROHEALTH SYSTEM 5.5% 02-15-52",
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        "weight": "0.00253546",
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      {
        "name": "SYRACUSE PILOT 5% 1/1/2034 @",
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      {
        "name": "PUBLIC FIN AUTH WI REVENUE PUBGEN 06/56 FIXED 4.5",
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      },
      {
        "name": "MWAA DULLES TOL 4% 10/1/2049",
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        "weight": "0.00243445",
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      {
        "name": "FL ST DEV FIN CORP",
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        "weight": "0.00238219",
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      },
      {
        "name": "BERKS PA MUN AU 3% 6/30/2044",
        "value": "12661578.55",
        "weight": "0.00237343",
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      },
      {
        "name": "OREGON ST FCS 4.90% 9/15/2035",
        "value": "12625405.76",
        "weight": "0.00236665",
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      {
        "name": "PUBLIC FIN WIS 5.50% 6/1/2055",
        "value": "12623062.43",
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      {
        "name": "Black Belt Energy Gas District, Series 2025 A",
        "value": "12418023.88",
        "weight": "0.00232777",
        "shared": false
      },
      {
        "name": "SOUTH CAROLINA ST HSG FIN & DEV AUTH MTGE REVENUE",
        "value": "12324825.15",
        "weight": "0.00231030",
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      },
      {
        "name": "VIRGIN ISLANDS HOTEL DEV FING REGD OID B/E 6.00000000",
        "value": "12111560.59",
        "weight": "0.00227033",
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      }
    ],
    "b_top": [
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      },
      {
        "name": "AB Fixed Income Shares, Inc. - Government Money Market Portfolio",
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      },
      {
        "name": "PUBLIC FIN AUTH WI REVENUE",
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      {
        "name": "VIRGINIA TOBACCO SENIOR-SER B1",
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      {
        "name": "ARC70 II TR CA",
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      {
        "name": "PUERTO RICO SALES TAX FING COR REGD ZCP OID B/E 0.00000000",
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      },
      {
        "name": "OH BUCGEN 5 06/01/2055",
        "value": "19796493.15",
        "weight": "0.00689677",
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      {
        "name": "BRISTOL TN INDL DEV BRD ST SALES TAX REVENUE",
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      {
        "name": "NY TRANS CORP 5% 7/1/41 @",
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        "weight": "0.00596645",
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      {
        "name": "NFA 2022-1 A 4.375% 09-20-36",
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      {
        "name": "RESTRUCTURED-CABS-SER",
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        "weight": "0.00562949",
        "shared": true
      },
      {
        "name": "Carrollton-Farmers Branch Independent School District, Series 2025, GO Bonds",
        "value": "15547084.81",
        "weight": "0.00541635",
        "shared": false
      },
      {
        "name": "Puerto Rico, General Obligation Bonds, Vintage CW NT Claims Taxable Series 2022",
        "value": "15303248.79",
        "weight": "0.00533140",
        "shared": true
      },
      {
        "name": "MANSFIELD TX INDEP SCH DIST",
        "value": "15119820.37",
        "weight": "0.00526749",
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      {
        "name": "PUERTO RICO SALES TAX FING COR REGD OID B/E 5.00000000",
        "value": "14944265.00",
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      },
      {
        "name": "Puerto Rico Electric Power Authority, Power Revenue Bonds, Refunding National Series 2007VV",
        "value": "14580399.63",
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      {
        "name": "ARKANSAS ST DEV FIN AUTH INDL REGD B/E AMT 7.37500000",
        "value": "14133251.60",
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      {
        "name": "GOLDEN ST TOBACCO SECURITIZATI REGD ZCP OID B/E 0.00000000",
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      },
      {
        "name": "CHICAGO IL BRD OF EDU REGD OID B/E 5.50000000",
        "value": "13663358.10",
        "weight": "0.00476009",
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      },
      {
        "name": "Wisconsin (State of) Center District, Series 2020 D, RB",
        "value": "13649260.60",
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      {
        "name": "ALIGN CAP SER 2021-3 TRUST",
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      {
        "name": "METROPOLITAN PIER & EXPOSITION AUTHORITY",
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      {
        "name": "MARYLAND ST STADIUM AUTH REVENUE",
        "value": "13041814.50",
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      {
        "name": "UNIV OF CALIFORNIA CA REVENUES REGD N/C B/E 5.25000000",
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      },
      {
        "name": "City of Atlanta, Series 2023 E",
        "value": "12528176.65",
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      },
      {
        "name": "MISSOURI ST HLTH & EDUCTNL FACS AUTH HLTH FACS REVENUE",
        "value": "12504033.15",
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      },
      {
        "name": "University of California, Series 2026 CE",
        "value": "12259428.00",
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      {
        "name": "NY TRANS CORP 5.50% 6/30/2054 @",
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      },
      {
        "name": "SCRANTON-LACKAWANNA PA HLTH & WELFARE AUTH",
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      },
      {
        "name": "NH NFADEV 4.12 01/20/2034",
        "value": "12096258.68",
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      },
      {
        "name": "CHICAGO IL BRD OF EDU REGD OID B/E 6.75000000",
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      {
        "name": "PUBLIC FIN AUTH WI REVENUE REGD OID B/E 4.00000000",
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      {
        "name": "California Community Housing Agency, Series A-1",
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      {
        "name": "LOS ANGELES-C-REF",
        "value": "11572593.00",
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      },
      {
        "name": "Black Belt Energy Gas District",
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      },
      {
        "name": "DALLAS-FORT WORTH TX INTERNATI REGD B/E AMT 5.00000000",
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      },
      {
        "name": "RESTRUCTURED-SER A-2",
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      },
      {
        "name": "OU MEDICINE OBLIGATED GROUP 5.5% 08-15-57",
        "value": "11308977.36",
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      },
      {
        "name": "NEW HAMPSHIRE ST HLTH & EDU FACS AUTH REVENUE",
        "value": "11255734.31",
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      },
      {
        "name": "Central Valley Energy Authority, Series 2026",
        "value": "10994264.00",
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      },
      {
        "name": "Public Energy Auth. of Kentucky Gas Supply Rev. Refg. C",
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      {
        "name": "PLEASANTON USD",
        "value": "10976912.42",
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      },
      {
        "name": "SOUTHEAST ENERGY-E",
        "value": "10898214.00",
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      },
      {
        "name": "AL BBEUTL 5 07/01/2033",
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      },
      {
        "name": "SAN ANTONIO TX ELEC & GAS REVE REGD B/E 5.25000000",
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      },
      {
        "name": "Salt River Project Agricultural Improvement & Power District, Series 2025, RB",
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      },
      {
        "name": "THE CHILDRENS TRUST FUND PR TO CHIGEN 05/57 ZEROCPNOID 0",
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      },
      {
        "name": "California (State of) Community Choice Financing Authority (Green Bonds), Series 2023 C, RB",
        "value": "10746832.00",
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        "shared": true
      },
      {
        "name": "MBTA SLS TAX 5.25% 7/1/55",
        "value": "10738695.00",
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      },
      {
        "name": "Phoenix Industrial Development Authority, Arizona, Education Facility Revenue Bonds, Great Hearts Academies Project, Series 2014A",
        "value": "10699838.01",
        "weight": "0.00372765",
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    ]
  },
  "error": null,
  "sources": [
    {
      "label": "N-PORT (fund A)",
      "accession_no": "0002071691-26-015576",
      "as_of": "2026-04-30",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/225604/000207169126015576/0002071691-26-015576-index.htm"
    },
    {
      "label": "N-PORT (fund B)",
      "accession_no": "0001410368-26-040411",
      "as_of": "2026-02-28",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/798737/000141036826040411/0001410368-26-040411-index.htm"
    }
  ]
}