{
  "page": "compare",
  "query": {
    "a": "MMIGX",
    "b": "AMHIX"
  },
  "retrieved_at": "2026-07-07T19:12:58+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 Income Fund",
    "ticker": "MMIGX",
    "slug": "MMIGX",
    "series_id": "S000002536",
    "html_url": "https://fundwatcher.app/funds/MMIGX/"
  },
  "fund_b": {
    "name": "American High-Income Municipal Bond Fund",
    "ticker": "AMHIX",
    "slug": "AMHIX",
    "series_id": "S000009229",
    "html_url": "https://fundwatcher.app/funds/AMHIX/"
  },
  "overlap": {
    "coverage_a_by_b": "0.1072873375852873112261432250",
    "coverage_b_by_a": "0.1072873375852873112261432251",
    "shared_count": 473,
    "as_of": {
      "a": "2026-03-31",
      "b": "2026-01-31"
    },
    "a_top": [
      {
        "name": "MFS Institutional Money Market Portfolio, Class A",
        "value": "168421496.15",
        "weight": "0.02436056",
        "shared": false
      },
      {
        "name": "Black Belt Energy Gas District",
        "value": "36524672.64",
        "weight": "0.00528294",
        "shared": false
      },
      {
        "name": "TEXAS ST MUNI GAS ACQUISITION& TEXAS MUNICIPAL GAS ACQUISITION & SUPPLY CORP IV",
        "value": "32484690.97",
        "weight": "0.00469860",
        "shared": true
      },
      {
        "name": "PRINCETON TX INDEP SCH DIST",
        "value": "29636666.36",
        "weight": "0.00428666",
        "shared": false
      },
      {
        "name": "NY TRANS CORP(JFK INT NEW ONE)/AGM 5.25% 6/30/60@",
        "value": "29151826.25",
        "weight": "0.00421653",
        "shared": false
      },
      {
        "name": "NY TRANS CORP(JFK INT NEW ONE)/AGM 5.13% 6/30/60@",
        "value": "29039960.93",
        "weight": "0.00420035",
        "shared": false
      },
      {
        "name": "New Hampshire Business Finance Authority, Series 2023A",
        "value": "28620989.28",
        "weight": "0.00413975",
        "shared": false
      },
      {
        "name": "California (State of) Community Choice Financing Authority (Green Bonds), Series 2023 C, RB",
        "value": "27756824.19",
        "weight": "0.00401476",
        "shared": false
      },
      {
        "name": "BLACK BELT ENGY GAS-C",
        "value": "25083362.48",
        "weight": "0.00362807",
        "shared": true
      },
      {
        "name": "NOVANT HEALTH OBLIGATED GROUP 5.5% 06-01-50",
        "value": "24283162.58",
        "weight": "0.00351233",
        "shared": true
      },
      {
        "name": "PUERTO RICO SALES TAX FING COR REGD OID B/E 5.00000000",
        "value": "23202443.77",
        "weight": "0.00335601",
        "shared": true
      },
      {
        "name": "VIRGINIA ST HSG DEV AUTH",
        "value": "21825945.31",
        "weight": "0.00315691",
        "shared": false
      },
      {
        "name": "PENNSYLVANIA ST ECON DEV FING REGD OID B/E AMT AG 5.00000000",
        "value": "21811357.13",
        "weight": "0.00315480",
        "shared": false
      },
      {
        "name": "QUEEN CREEK AZ COPS",
        "value": "21660973.28",
        "weight": "0.00313305",
        "shared": false
      },
      {
        "name": "Connecticut State Health & Educational Facilities Authority, Series A",
        "value": "21380008.00",
        "weight": "0.00309241",
        "shared": false
      },
      {
        "name": "METROCARE SVC REV",
        "value": "21222926.80",
        "weight": "0.00306969",
        "shared": false
      },
      {
        "name": "NY TRANSPRTN DEV CORP",
        "value": "20732607.80",
        "weight": "0.00299877",
        "shared": true
      },
      {
        "name": "MD HLTH HGR AUTH-A",
        "value": "20554628.00",
        "weight": "0.00297303",
        "shared": false
      },
      {
        "name": "WV HOSP 5.375% 9/1/2053",
        "value": "20473933.37",
        "weight": "0.00296136",
        "shared": false
      },
      {
        "name": "TENNERGY CORP TN GAS REVENUE TGYPWR 10/53 ADJUSTABLE VAR",
        "value": "20436540.28",
        "weight": "0.00295595",
        "shared": false
      },
      {
        "name": "JEA WTR & SWR REV-A",
        "value": "20427563.65",
        "weight": "0.00295465",
        "shared": false
      },
      {
        "name": "Black Belt Energy Gas District, Series 2025 A",
        "value": "20107281.45",
        "weight": "0.00290833",
        "shared": false
      },
      {
        "name": "Delaware State Housing Authority, Series BDS 2023",
        "value": "19927531.01",
        "weight": "0.00288233",
        "shared": false
      },
      {
        "name": "TX PRIVATE ACTIVITY",
        "value": "19277807.52",
        "weight": "0.00278835",
        "shared": false
      },
      {
        "name": "Energy Southeast Cooperative District, Alabama, Energy Supply Revenue Bonds, Series 2025B",
        "value": "19241087.03",
        "weight": "0.00278304",
        "shared": true
      },
      {
        "name": "Alachua County Health Facilities Authority, Series 2025 A",
        "value": "19131332.09",
        "weight": "0.00276716",
        "shared": false
      },
      {
        "name": "Southeast Energy Authority, Alabama, Commodity Supply Revenue Bonds, Project 5, Series 2023A",
        "value": "19051853.45",
        "weight": "0.00275567",
        "shared": false
      },
      {
        "name": "TOWER HEALTH OBLIGATED GROUP 5.0% 06-30-39",
        "value": "18315498.74",
        "weight": "0.00264916",
        "shared": true
      },
      {
        "name": "MAIN STR NAT GA 5% MT",
        "value": "18310997.25",
        "weight": "0.00264851",
        "shared": false
      },
      {
        "name": "SPOKANE CNTY WA ARPT REVENUE",
        "value": "18295917.76",
        "weight": "0.00264633",
        "shared": false
      },
      {
        "name": "BLACK BELT ENERGY GAS VAR",
        "value": "18134798.50",
        "weight": "0.00262303",
        "shared": true
      },
      {
        "name": "CHICAGO ILLIN 6% 4/1/2046",
        "value": "17999717.26",
        "weight": "0.00260349",
        "shared": true
      },
      {
        "name": "California (State of) Housing Finance Agency (Social Certificates), Series 2023-1, RB",
        "value": "17903581.23",
        "weight": "0.00258958",
        "shared": true
      },
      {
        "name": "Fishers Town Hall Building Corp., Series 2023 A, RB",
        "value": "17353109.79",
        "weight": "0.00250996",
        "shared": false
      },
      {
        "name": "MASSACHUSETTS ST DEV FIN AGY R REGD B/E 5.00000000",
        "value": "17214293.50",
        "weight": "0.00248988",
        "shared": false
      },
      {
        "name": "Maryland Department of Housing & Community Development, Series 2024 E",
        "value": "17179480.78",
        "weight": "0.00248485",
        "shared": false
      },
      {
        "name": "WISCONSIN ST HT 4% 4/1/2040",
        "value": "16827152.94",
        "weight": "0.00243389",
        "shared": false
      },
      {
        "name": "New Hampshire Business Finance Authority, Series 2024A",
        "value": "16753590.49",
        "weight": "0.00242325",
        "shared": false
      },
      {
        "name": "PENNSYLVANIA ST ECON DEV FING REGD B/E AMT 5.00000000",
        "value": "16680576.77",
        "weight": "0.00241269",
        "shared": false
      },
      {
        "name": "Public Energy Authority of Kentucky, Gas Supply Revenue Bonds, Series 2025B",
        "value": "16505537.96",
        "weight": "0.00238737",
        "shared": true
      },
      {
        "name": "COLORADO ST HLTH FACS AUTH REV REGD B/E 4.00000000",
        "value": "16297175.41",
        "weight": "0.00235723",
        "shared": false
      },
      {
        "name": "ORANGE HLTH FACS-A",
        "value": "15910063.75",
        "weight": "0.00230124",
        "shared": false
      },
      {
        "name": "Jefferson (County of), AL, Series 2024, Ref. Revenue Wts.",
        "value": "15783655.47",
        "weight": "0.00228295",
        "shared": true
      },
      {
        "name": "SAN ANTONIO WTR 5.25% 5/15/2052",
        "value": "15584064.00",
        "weight": "0.00225409",
        "shared": false
      },
      {
        "name": "Travis County Healthcare District",
        "value": "15503484.00",
        "weight": "0.00224243",
        "shared": false
      },
      {
        "name": "Energy Southeast A Cooperative District, Series B-1",
        "value": "15438008.00",
        "weight": "0.00223296",
        "shared": true
      },
      {
        "name": "MICHIGAN ST HSG DEV AUTH RENTAL HSG REVENUE",
        "value": "15431357.06",
        "weight": "0.00223200",
        "shared": false
      },
      {
        "name": "FRETE ML-15 TRUST",
        "value": "15402544.35",
        "weight": "0.00222783",
        "shared": true
      },
      {
        "name": "California Community Choice Financing Authority, Series C",
        "value": "15398843.24",
        "weight": "0.00222730",
        "shared": true
      },
      {
        "name": "NY NYCDEV 5 11/15/2044",
        "value": "15300419.22",
        "weight": "0.00221306",
        "shared": false
      }
    ],
    "b_top": [
      {
        "name": "Puerto Rico, General Obligation Bonds, Clawback Highway Transportation Authority Claims Taxable Series 2022",
        "value": "128513212.80",
        "weight": "0.00935438",
        "shared": false
      },
      {
        "name": "Puerto Rico, General Obligation Bonds, Vintage CW NT Claims Taxable Series 2022",
        "value": "125136094.85",
        "weight": "0.00910856",
        "shared": true
      },
      {
        "name": "U.S. Treasury Bills",
        "value": "79992104.00",
        "weight": "0.00582256",
        "shared": false
      },
      {
        "name": "NEW YORK CITY TRANSITIONAL FINANCE AUTHORITY FUTURE TAX SECURED REVENUE FRN 11-01-54",
        "value": "47550000.00",
        "weight": "0.00346113",
        "shared": false
      },
      {
        "name": "WASTE PRO USA INC 3.0% 06-01-32",
        "value": "46753240.20",
        "weight": "0.00340313",
        "shared": false
      },
      {
        "name": "BIG RIVER STEEL LLC 4.5% 09-01-49",
        "value": "46734163.64",
        "weight": "0.00340174",
        "shared": false
      },
      {
        "name": "UIPA CROSSROADS PUBLIC INFRASTRUCTURE DISTRICT AJL PROJECT AREA 4.375% 06-01-52",
        "value": "45745886.61",
        "weight": "0.00332981",
        "shared": false
      },
      {
        "name": "Wisconsin (State of) Public Finance Authority, Series 2023 B, RB",
        "value": "45179437.50",
        "weight": "0.00328858",
        "shared": false
      },
      {
        "name": "CSCDA COMMUNITY IMPROVEMENT AUTHORITY UNION SOUTH BAY 4.0% 07-01-56",
        "value": "41819255.31",
        "weight": "0.00304399",
        "shared": false
      },
      {
        "name": "NEW YORK NY REGD V/R B/E 2.65000000",
        "value": "41800000.00",
        "weight": "0.00304259",
        "shared": false
      },
      {
        "name": "HM Metropolitan District No. 2, Series 2021, GO Bonds",
        "value": "40888143.48",
        "weight": "0.00297622",
        "shared": false
      },
      {
        "name": "EDUCATIONAL GROWTH FUND LLC 5.0% 07-01-56",
        "value": "39166091.48",
        "weight": "0.00285087",
        "shared": false
      },
      {
        "name": "PUERTO RICO SALES TAX FING COR REGD ZCP OID B/E 0.00000000",
        "value": "39012358.00",
        "weight": "0.00283968",
        "shared": true
      },
      {
        "name": "Puerto Rico Commonwealth Aqueduct & Sewer Authority, Series A",
        "value": "38799848.66",
        "weight": "0.00282421",
        "shared": false
      },
      {
        "name": "UNITED AIRLINES INC 4.0% 07-15-41",
        "value": "38518731.85",
        "weight": "0.00280375",
        "shared": false
      },
      {
        "name": "Public Energy Auth. of Kentucky Gas Supply Rev. Refg. C",
        "value": "36888742.00",
        "weight": "0.00268510",
        "shared": false
      },
      {
        "name": "BIG RIVER STEEL LLC 4.75% 09-01-49",
        "value": "35884394.72",
        "weight": "0.00261200",
        "shared": false
      },
      {
        "name": "OH BUCGEN 5 06/01/2055",
        "value": "35124290.50",
        "weight": "0.00255667",
        "shared": true
      },
      {
        "name": "Montgomery (County of), MD, Series 2017, GO Bonds",
        "value": "34665000.00",
        "weight": "0.00252324",
        "shared": false
      },
      {
        "name": "Black Belt Energy Gas District, Series 2025 G",
        "value": "34389073.99",
        "weight": "0.00250315",
        "shared": false
      },
      {
        "name": "IL CHIEDU 5 12/01/2042",
        "value": "34258948.02",
        "weight": "0.00249368",
        "shared": true
      },
      {
        "name": "PUERTO RICO SALES TAX FING COR REGD OID B/E 4.75000000",
        "value": "34107948.67",
        "weight": "0.00248269",
        "shared": true
      },
      {
        "name": "RESTRUCTURED-SER A1",
        "value": "33807091.72",
        "weight": "0.00246079",
        "shared": true
      },
      {
        "name": "Puerto Rico Commonwealth Aqueduct & Sewer Authority, Series B",
        "value": "33411815.64",
        "weight": "0.00243202",
        "shared": false
      },
      {
        "name": "CO CCKFAC 6 12/01/2051",
        "value": "33269477.90",
        "weight": "0.00242166",
        "shared": false
      },
      {
        "name": "WA ST HSG FIN COMMN-1",
        "value": "31984346.88",
        "weight": "0.00232812",
        "shared": false
      },
      {
        "name": "State of Hawaii Department of Budget and Finance, The Queen's Health Systems, Series 2025B",
        "value": "31870000.00",
        "weight": "0.00231979",
        "shared": false
      },
      {
        "name": "CHICAGO IL BRD OF EDU REGD OID B/E 7.00000000",
        "value": "31584014.00",
        "weight": "0.00229898",
        "shared": false
      },
      {
        "name": "NY TRANSPRTN DEV -AMT",
        "value": "31483876.32",
        "weight": "0.00229169",
        "shared": false
      },
      {
        "name": "TOBACCO SETTLEMENT-B2",
        "value": "31442203.98",
        "weight": "0.00228865",
        "shared": false
      },
      {
        "name": "FREDDIE MAC MULTIFAMILY ML CERTIFICATES SER 2024-ML26 CL A V/R 3.26001000",
        "value": "31288380.46",
        "weight": "0.00227746",
        "shared": false
      },
      {
        "name": "PALISADE PARK NORTH METROPOLITAN DISTRICT NO 3 5.5% 12-01-51",
        "value": "30810305.32",
        "weight": "0.00224266",
        "shared": false
      },
      {
        "name": "Tender Option Bond Trust Receipts/Certificates",
        "value": "29720389.44",
        "weight": "0.00216332",
        "shared": false
      },
      {
        "name": "STATE OF HAWAII DEPARTMENT OF BUDGET & FINANCE 4.0% 03-01-37",
        "value": "29713449.36",
        "weight": "0.00216282",
        "shared": false
      },
      {
        "name": "LONGS PEAK METROPOLITAN DISTRICT 5.25% 12-01-51",
        "value": "29712834.72",
        "weight": "0.00216277",
        "shared": false
      },
      {
        "name": "TOWN OF LITTLE ELM TX SPIRITAS RANCH PUBLIC IMPROVEMENT DISTRICT 5.375% 09-01-51",
        "value": "29619146.15",
        "weight": "0.00215596",
        "shared": false
      },
      {
        "name": "AM BIDCO OPERATIONS LLC PIK TL 1ST LIEN 8.5% 10-21-27",
        "value": "29561841.69",
        "weight": "0.00215178",
        "shared": false
      },
      {
        "name": "CSCDA Community Improvement Authority, Series 2021 A",
        "value": "29434923.74",
        "weight": "0.00214255",
        "shared": false
      },
      {
        "name": "NY TRANS CORP 5% 8/1/2031 AMT",
        "value": "29411465.98",
        "weight": "0.00214084",
        "shared": false
      },
      {
        "name": "LOUISIANA ST LOCAL GOVT ENVRNM REGD B/E 2.50000000",
        "value": "28876004.10",
        "weight": "0.00210186",
        "shared": false
      },
      {
        "name": "BUCKLEY METROPOLITAN DISTRICT NO 2 6.0% 12-01-51",
        "value": "28818244.80",
        "weight": "0.00209766",
        "shared": false
      },
      {
        "name": "BROOKLYN EVENTS CENTER LLC 5.0% 07-15-42",
        "value": "28662408.18",
        "weight": "0.00208631",
        "shared": false
      },
      {
        "name": "UNITED AIRLINES INC 5.25% 07-15-34",
        "value": "28435137.75",
        "weight": "0.00206977",
        "shared": true
      },
      {
        "name": "Rampart Range Metropolitan District No. 5, Series 2021, RB",
        "value": "28365493.66",
        "weight": "0.00206470",
        "shared": false
      },
      {
        "name": "New Hampshire (State of) Business Finance Authority (Social Bonds), Series 2022-2A, RB",
        "value": "28158572.09",
        "weight": "0.00204964",
        "shared": true
      },
      {
        "name": "RIVERSIDE HEALTHCARE ASSOCIATION OBLIGATED GROUP 5.33% 07-01-45",
        "value": "27901646.10",
        "weight": "0.00203094",
        "shared": false
      },
      {
        "name": "California Community Housing Agency, Series 2021 A-2",
        "value": "27595370.25",
        "weight": "0.00200865",
        "shared": false
      },
      {
        "name": "TX EXXON 12 G=EXXON V1",
        "value": "27400000.00",
        "weight": "0.00199443",
        "shared": false
      },
      {
        "name": "LOUDOUN IDA VAR-C-HOW",
        "value": "27200000.00",
        "weight": "0.00197987",
        "shared": false
      },
      {
        "name": "NY TRANS CORP(LAGUARDIA GATEW) 5.25% 1/1/50@",
        "value": "27176141.35",
        "weight": "0.00197813",
        "shared": false
      }
    ]
  },
  "error": null,
  "sources": [
    {
      "label": "N-PORT (fund A)",
      "accession_no": "0002071691-26-011438",
      "as_of": "2026-03-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/751656/000207169126011438/0002071691-26-011438-index.htm"
    },
    {
      "label": "N-PORT (fund B)",
      "accession_no": "0001193125-26-130883",
      "as_of": "2026-01-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/925950/000119312526130883/0001193125-26-130883-index.htm"
    }
  ]
}