{
  "page": "compare",
  "query": {
    "a": "AMABX",
    "b": "FDMMX"
  },
  "retrieved_at": "2026-07-07T18:02:44+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": "AB Massachusetts Portfolio",
    "ticker": "AMABX",
    "slug": "AMABX",
    "series_id": "S000010355",
    "html_url": "https://fundwatcher.app/funds/AMABX/"
  },
  "fund_b": {
    "name": "Fidelity Massachusetts Municipal Income Fund",
    "ticker": "FDMMX",
    "slug": "FDMMX",
    "series_id": "S000007114",
    "html_url": "https://fundwatcher.app/funds/FDMMX/"
  },
  "overlap": {
    "coverage_a_by_b": "0.03962367836191329983297887423",
    "coverage_b_by_a": "0.03962367836191329983297887422",
    "shared_count": 16,
    "as_of": {
      "a": "2026-02-28",
      "b": "2026-01-31"
    },
    "a_top": [
      {
        "name": "QUINCY MA",
        "value": "7329477.65",
        "weight": "0.02826054",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY REVENUE",
        "value": "7154974.97",
        "weight": "0.02758770",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY REVENUE",
        "value": "5607897.34",
        "weight": "0.02162258",
        "shared": false
      },
      {
        "name": "Massachusetts Water Resources Authority",
        "value": "5567857.90",
        "weight": "0.02146820",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST MAS 12/54 FIXED 5",
        "value": "5246557.00",
        "weight": "0.02022934",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST",
        "value": "5173718.50",
        "weight": "0.01994850",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST PORT AUTH REGD B/E AMT 5.00000000",
        "value": "5066577.50",
        "weight": "0.01953539",
        "shared": true
      },
      {
        "name": "MASSACHUSETTS ST PORT AUTH",
        "value": "5020833.45",
        "weight": "0.01935901",
        "shared": false
      },
      {
        "name": "MA ST DEV FIN AGY",
        "value": "4318442.40",
        "weight": "0.01665078",
        "shared": false
      },
      {
        "name": "MBTA SLS TAX 5.25% 7/1/2053",
        "value": "4251004.40",
        "weight": "0.01639076",
        "shared": true
      },
      {
        "name": "MA ST",
        "value": "4248466.80",
        "weight": "0.01638097",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST PORT AUTH",
        "value": "4237713.60",
        "weight": "0.01633951",
        "shared": true
      },
      {
        "name": "MBTA SLS TAX 5.25% 7/1/55",
        "value": "3758543.25",
        "weight": "0.01449195",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY R REGD B/E 5.00000000",
        "value": "3756941.71",
        "weight": "0.01448578",
        "shared": false
      },
      {
        "name": "MASS DEVEL FIN 5% 7/1/2050",
        "value": "3558042.53",
        "weight": "0.01371888",
        "shared": true
      },
      {
        "name": "QUINCY MA",
        "value": "3502745.59",
        "weight": "0.01350567",
        "shared": false
      },
      {
        "name": "PRG MEDFORD PROPERTIES INC 5.25% 06-01-55",
        "value": "3401821.15",
        "weight": "0.01311653",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY REVENUE",
        "value": "3323480.65",
        "weight": "0.01281447",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY REVENUE",
        "value": "3300276.60",
        "weight": "0.01272500",
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      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY REVENUE",
        "value": "3149945.60",
        "weight": "0.01214536",
        "shared": false
      },
      {
        "name": "MASS CMNWLTH-B",
        "value": "3138277.50",
        "weight": "0.01210037",
        "shared": false
      },
      {
        "name": "MA ST TRANS REV 5% 6/1/52",
        "value": "3115159.20",
        "weight": "0.01201123",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST BAY TRANSPRTN MASTRN 07/50 FIXED 5",
        "value": "3053340.30",
        "weight": "0.01177288",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY REVENUE",
        "value": "3053237.40",
        "weight": "0.01177248",
        "shared": false
      },
      {
        "name": "MASS DEVEL FIN 5% 7/1/2053",
        "value": "3020805.90",
        "weight": "0.01164743",
        "shared": false
      },
      {
        "name": "U.S. Treasury Bills",
        "value": "2986427.64",
        "weight": "0.01151488",
        "shared": false
      },
      {
        "name": "SUFFOLK UNIVERSITY 5.25% 07-01-55",
        "value": "2985330.30",
        "weight": "0.01151065",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST PORT AUTH",
        "value": "2630395.00",
        "weight": "0.01014211",
        "shared": false
      },
      {
        "name": "UNIV OF MASSACHUSETTS MA BLDG AUTH REVENUE",
        "value": "2600748.00",
        "weight": "0.01002780",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY REVENUE",
        "value": "2502547.25",
        "weight": "0.00964916",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST",
        "value": "2453085.63",
        "weight": "0.00945845",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY REVENUE",
        "value": "2325443.54",
        "weight": "0.00896630",
        "shared": false
      },
      {
        "name": "MA ST DEV FIN AGY-M",
        "value": "2315681.40",
        "weight": "0.00892866",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY REVENUE",
        "value": "2267176.50",
        "weight": "0.00874164",
        "shared": false
      },
      {
        "name": "Territory of Guam, Series F",
        "value": "2242394.55",
        "weight": "0.00864608",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST",
        "value": "2181310.00",
        "weight": "0.00841056",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY R MASDEV 07/54 FIXED OID 5",
        "value": "2160222.24",
        "weight": "0.00832925",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST",
        "value": "2155022.40",
        "weight": "0.00830920",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST PORT AUTH SPL FACS REVENUE",
        "value": "2136257.40",
        "weight": "0.00823685",
        "shared": true
      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY REVENUE",
        "value": "2122107.40",
        "weight": "0.00818229",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY REVENUE",
        "value": "2108237.46",
        "weight": "0.00812881",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST MAS 10/52 FIXED 5",
        "value": "2085703.26",
        "weight": "0.00804192",
        "shared": false
      },
      {
        "name": "WORCESTER MA",
        "value": "2075932.04",
        "weight": "0.00800425",
        "shared": false
      },
      {
        "name": "MA ST TRANS REV 5% 6/1/50",
        "value": "2075602.60",
        "weight": "0.00800298",
        "shared": true
      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY REVENUE",
        "value": "2069881.84",
        "weight": "0.00798092",
        "shared": true
      },
      {
        "name": "MA ST DFA 5% 7/1/39",
        "value": "2058526.17",
        "weight": "0.00793714",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST BAY TRANSPRTN AUTH SALES TAX REVENUE",
        "value": "2056412.80",
        "weight": "0.00792899",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST HLTH & EDUCTNL FACS AUTH REVENUE",
        "value": "2054407.68",
        "weight": "0.00792126",
        "shared": false
      },
      {
        "name": "QUINCY MA",
        "value": "2030217.40",
        "weight": "0.00782798",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY R REGD B/E 5.00000000",
        "value": "2011219.80",
        "weight": "0.00775473",
        "shared": false
      }
    ],
    "b_top": [
      {
        "name": "Fidelity Municipal Cash Central Fund",
        "value": "143226612.28",
        "weight": "0.07984154",
        "shared": false
      },
      {
        "name": "MA ST 5% 9/1/2049",
        "value": "51634740.00",
        "weight": "0.02878374",
        "shared": false
      },
      {
        "name": "COMMONWLTH OF 5% 12/1/2037",
        "value": "39375733.20",
        "weight": "0.02194996",
        "shared": false
      },
      {
        "name": "MA ST 5% 11/1/52",
        "value": "33389519.37",
        "weight": "0.01861295",
        "shared": false
      },
      {
        "name": "MA TPK CAB-SR-SER A",
        "value": "30865305.19",
        "weight": "0.01720583",
        "shared": false
      },
      {
        "name": "MA ST 3% 2/1/2048",
        "value": "29411442.45",
        "weight": "0.01639538",
        "shared": false
      },
      {
        "name": "MA ST 5% 11/1/2050",
        "value": "24038347.36",
        "weight": "0.01340015",
        "shared": false
      },
      {
        "name": "MA ST 5.25% 1/1/2033",
        "value": "22804330.82",
        "weight": "0.01271225",
        "shared": false
      },
      {
        "name": "COMMONWLTH OF 5% 12/1/2036",
        "value": "22217024.90",
        "weight": "0.01238486",
        "shared": false
      },
      {
        "name": "MA ST TRANS REV 5% 6/1/2053",
        "value": "21065860.35",
        "weight": "0.01174314",
        "shared": false
      },
      {
        "name": "MA ST SPL OB DE 5.50% NATL/FGIC 1/1/2030",
        "value": "18998640.70",
        "weight": "0.01059077",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST SPL OBLIG DEDICATED TAX REV FGIC",
        "value": "17373033.78",
        "weight": "0.00968458",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST SCH BLDG AUTH SALES TAX REVENUE",
        "value": "16993639.24",
        "weight": "0.00947309",
        "shared": false
      },
      {
        "name": "MA ST 3% 4/1/2048",
        "value": "16514322.00",
        "weight": "0.00920589",
        "shared": false
      },
      {
        "name": "MA ST HSG FIN AGY-C2",
        "value": "16319780.80",
        "weight": "0.00909745",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST PORT AUTH REGD B/E AMT 5.00000000",
        "value": "16293025.18",
        "weight": "0.00908253",
        "shared": true
      },
      {
        "name": "MA ST TRANS REV 5% 6/1/2044",
        "value": "16283052.00",
        "weight": "0.00907697",
        "shared": false
      },
      {
        "name": "MA ST TRANS REV 5% 6/1/2042",
        "value": "16223737.41",
        "weight": "0.00904391",
        "shared": false
      },
      {
        "name": "MA ST TRANS REV 5.25% 6/1/2043",
        "value": "15121988.09",
        "weight": "0.00842974",
        "shared": false
      },
      {
        "name": "MASS DFA SOUTHCST HLTH 4% 7/43",
        "value": "14776758.40",
        "weight": "0.00823729",
        "shared": true
      },
      {
        "name": "BOSTON MA 5% 2/1/2039",
        "value": "14482498.67",
        "weight": "0.00807325",
        "shared": false
      },
      {
        "name": "MA CL WTR TR 5% 2/1/2039",
        "value": "14100366.03",
        "weight": "0.00786024",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY REVENUE",
        "value": "13657695.00",
        "weight": "0.00761347",
        "shared": false
      },
      {
        "name": "MA TPK CAB-SR-SER A",
        "value": "12116155.60",
        "weight": "0.00675414",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST SCH BLDG AUTH SALES TAX REVENUE",
        "value": "11878315.40",
        "weight": "0.00662156",
        "shared": false
      },
      {
        "name": "MA PORT 5% 7/1/2038@",
        "value": "11814561.74",
        "weight": "0.00658602",
        "shared": false
      },
      {
        "name": "MA ST 5% 7/1/2048",
        "value": "11373802.34",
        "weight": "0.00634031",
        "shared": false
      },
      {
        "name": "MBTA SLS TAX 5.25% 7/1/2052",
        "value": "11185375.86",
        "weight": "0.00623528",
        "shared": false
      },
      {
        "name": "MASS DEV FIN AGY-K",
        "value": "10965538.40",
        "weight": "0.00611273",
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      },
      {
        "name": "MA ED LN AUTH 5% 7/1/2030 @",
        "value": "10650113.00",
        "weight": "0.00593690",
        "shared": false
      },
      {
        "name": "MA ST 5% 1/1/2037",
        "value": "10611102.00",
        "weight": "0.00591515",
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      },
      {
        "name": "MA DFA 5% 4/1/2033",
        "value": "10515874.82",
        "weight": "0.00586206",
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      },
      {
        "name": "MA ED LN AUTH 5% 7/1/2027 @",
        "value": "10508133.38",
        "weight": "0.00585775",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST SCH BLDG AUTH SALES TAX REVENUE",
        "value": "10426034.00",
        "weight": "0.00581198",
        "shared": false
      },
      {
        "name": "MA ST 3% 4/1/2049",
        "value": "10205761.05",
        "weight": "0.00568919",
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      },
      {
        "name": "MA ST 5% 1/1/2049",
        "value": "10193978.00",
        "weight": "0.00568262",
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      },
      {
        "name": "MA ST HSG FIN A 3.15% 6/1/2030",
        "value": "10077888.00",
        "weight": "0.00561791",
        "shared": false
      },
      {
        "name": "Massachusetts (Commonwealth of), Series 2024, GO Bonds",
        "value": "9202876.00",
        "weight": "0.00513013",
        "shared": false
      },
      {
        "name": "MA ST TRANS REV 5% 6/1/2041",
        "value": "8759752.74",
        "weight": "0.00488312",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST PORT AUTH SPL FACS REVENUE",
        "value": "8740116.88",
        "weight": "0.00487217",
        "shared": false
      },
      {
        "name": "MA ST 5% 11/1/2043",
        "value": "8694969.34",
        "weight": "0.00484700",
        "shared": false
      },
      {
        "name": "Massachusetts Development Finance Agency, Series 2024 U-1",
        "value": "8500000.00",
        "weight": "0.00473832",
        "shared": false
      },
      {
        "name": "MBTA SLS TAX 5.25% 7/1/2053",
        "value": "8428056.80",
        "weight": "0.00469821",
        "shared": true
      },
      {
        "name": "MA ST TRANS REV 5% 6/1/2047",
        "value": "8374790.40",
        "weight": "0.00466852",
        "shared": false
      },
      {
        "name": "MA WTR 5% 8/1/42",
        "value": "7886186.92",
        "weight": "0.00439615",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY REVENUE",
        "value": "7871510.25",
        "weight": "0.00438797",
        "shared": false
      },
      {
        "name": "MA ST TRANS REV 5% 6/1/2048",
        "value": "7670975.24",
        "weight": "0.00427618",
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      },
      {
        "name": "MBTA SLS TAX 0% 7/1/2032",
        "value": "7636143.67",
        "weight": "0.00425676",
        "shared": false
      },
      {
        "name": "MA CL WTR TR 5% 2/1/2037",
        "value": "7617426.70",
        "weight": "0.00424633",
        "shared": false
      },
      {
        "name": "MASS DEVEL FIN 4% 7/1/2040",
        "value": "7458423.98",
        "weight": "0.00415769",
        "shared": false
      }
    ]
  },
  "error": null,
  "sources": [
    {
      "label": "N-PORT (fund A)",
      "accession_no": "0001410368-26-040406",
      "as_of": "2026-02-28",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/899774/000141036826040406/0001410368-26-040406-index.htm"
    },
    {
      "label": "N-PORT (fund B)",
      "accession_no": "0000035402-26-002005",
      "as_of": "2026-01-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/357057/000003540226002005/0000035402-26-002005-index.htm"
    }
  ]
}