{
  "page": "compare",
  "query": {
    "a": "MTLBX",
    "b": "FSMB"
  },
  "retrieved_at": "2026-07-07T19:06:15+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 Limited Maturity Fund",
    "ticker": "MTLBX",
    "slug": "MTLBX",
    "series_id": "S000002496",
    "html_url": "https://fundwatcher.app/funds/MTLBX/"
  },
  "fund_b": {
    "name": "First Trust Short Duration Managed Municipal ETF",
    "ticker": "FSMB",
    "slug": "FSMB",
    "series_id": "S000063445",
    "html_url": "https://fundwatcher.app/funds/FSMB/"
  },
  "overlap": {
    "coverage_a_by_b": "0.07180691614627882598438712269",
    "coverage_b_by_a": "0.07180691614627882598438712271",
    "shared_count": 52,
    "as_of": {
      "a": "2026-04-30",
      "b": "2026-04-30"
    },
    "a_top": [
      {
        "name": "MFS Institutional Money Market Portfolio, Class A",
        "value": "112692414.14",
        "weight": "0.03598440",
        "shared": false
      },
      {
        "name": "DFW ARPT 5% 11/1/2050 MT @",
        "value": "25389261.35",
        "weight": "0.00810718",
        "shared": false
      },
      {
        "name": "COLLIER COUNTY INDUSTRIAL DEVE COLDEV 04/35 FIXED 5",
        "value": "22226644.00",
        "weight": "0.00709731",
        "shared": false
      },
      {
        "name": "CALIFORNIA COMMUNITY VAR",
        "value": "22212838.96",
        "weight": "0.00709290",
        "shared": false
      },
      {
        "name": "California (State of) Community Choice Financing Authority (Green Bonds), Series 2023 C, RB",
        "value": "22028757.15",
        "weight": "0.00703412",
        "shared": false
      },
      {
        "name": "TN TNSUTL 05/01/2053",
        "value": "19556162.30",
        "weight": "0.00624458",
        "shared": true
      },
      {
        "name": "WISCONSIN HEALTH & ED VAR",
        "value": "18599815.60",
        "weight": "0.00593920",
        "shared": false
      },
      {
        "name": "San Francisco City & County Airport Comm-San Francisco International Airport, Series 2025 A",
        "value": "18319684.35",
        "weight": "0.00584975",
        "shared": false
      },
      {
        "name": "CO ST HLTH FACS-UNREF",
        "value": "17928780.58",
        "weight": "0.00572493",
        "shared": false
      },
      {
        "name": "TENNERGY CORP TN GAS REVENUE TGYPWR 10/53 ADJUSTABLE VAR",
        "value": "16912186.16",
        "weight": "0.00540032",
        "shared": false
      },
      {
        "name": "TX TAREDU 11/15/2055",
        "value": "16520958.00",
        "weight": "0.00527539",
        "shared": false
      },
      {
        "name": "Black Belt Energy Gas District",
        "value": "16130063.41",
        "weight": "0.00515057",
        "shared": false
      },
      {
        "name": "TX MUNI GAS ACQ VI",
        "value": "15836730.00",
        "weight": "0.00505691",
        "shared": false
      },
      {
        "name": "FLORIDA DEV FIN CORP HLTHCAREFACS REVENUE",
        "value": "15649609.74",
        "weight": "0.00499716",
        "shared": true
      },
      {
        "name": "New Hampshire Business Finance Authority, Series 2023A",
        "value": "15544728.27",
        "weight": "0.00496367",
        "shared": false
      },
      {
        "name": "RESTRUCTURED-SER A1",
        "value": "15524714.25",
        "weight": "0.00495728",
        "shared": false
      },
      {
        "name": "AL BBEUTL 5 10/01/2033",
        "value": "15365346.98",
        "weight": "0.00490639",
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      },
      {
        "name": "MAIN STR NAT GA 4% MT",
        "value": "15309112.01",
        "weight": "0.00488843",
        "shared": false
      },
      {
        "name": "EP TUSCANY ZARAGOSA PFC TX EPTMFH 12/33 FIXED OID 4",
        "value": "15008650.50",
        "weight": "0.00479249",
        "shared": false
      },
      {
        "name": "REPUBLIC SERVICES INC (MPT) 3.45% 12-01-35",
        "value": "15000000.00",
        "weight": "0.00478973",
        "shared": false
      },
      {
        "name": "Energy Southeast Cooperative District, Alabama, Energy Supply Revenue Bonds, Series 2025B",
        "value": "14846239.70",
        "weight": "0.00474063",
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      },
      {
        "name": "ILLINOIS FIN AUTH-A-2",
        "value": "14833670.58",
        "weight": "0.00473662",
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      },
      {
        "name": "DENVER CITY & CNTY CO ARPT REVENUE",
        "value": "14709023.00",
        "weight": "0.00469681",
        "shared": false
      },
      {
        "name": "Deerfield Community School District",
        "value": "14627678.30",
        "weight": "0.00467084",
        "shared": false
      },
      {
        "name": "HARRIS CNTY TX CULTURAL EDU FA REGD N/C B/E 5.00000000",
        "value": "14065470.00",
        "weight": "0.00449132",
        "shared": false
      },
      {
        "name": "PUERTO RICO SALES TAX FING COR REGD ZCP OID B/E 0.00000000",
        "value": "13820434.94",
        "weight": "0.00441307",
        "shared": false
      },
      {
        "name": "MICHIGAN ST HOSP FIN AUTH MICHIGAN STATE HOSPITAL FINANCE AUTHORITY",
        "value": "13259811.60",
        "weight": "0.00423406",
        "shared": false
      },
      {
        "name": "DeKalb (County of), GA Housing Authority (Park at 500), Series 2024, RB",
        "value": "12852068.43",
        "weight": "0.00410386",
        "shared": false
      },
      {
        "name": "Wayne County Airport Authority, Series 2025G",
        "value": "12769459.20",
        "weight": "0.00407748",
        "shared": true
      },
      {
        "name": "Southeast Energy Authority, Alabama, Commodity Supply Revenue Bonds, Project 5, Series 2023A",
        "value": "12617484.00",
        "weight": "0.00402895",
        "shared": false
      },
      {
        "name": "PUERTO RICO SALES TAX FING COR REGD ZCP OID B/E 0.00000000",
        "value": "12495690.61",
        "weight": "0.00399006",
        "shared": false
      },
      {
        "name": "TEXAS ST MUNI GAS ACQUISITION& TEXAS MUNICIPAL GAS ACQUISITION & SUPPLY CORP IV",
        "value": "12396054.12",
        "weight": "0.00395825",
        "shared": false
      },
      {
        "name": "VANCOUVER WA HSG AUTH REGD OID B/E 4.00000000",
        "value": "11951388.72",
        "weight": "0.00381626",
        "shared": false
      },
      {
        "name": "ROCHESTER GAS AND ELECTRIC CORP 4.0% 05-15-32",
        "value": "11813297.79",
        "weight": "0.00377217",
        "shared": false
      },
      {
        "name": "Pennsylvania Economic Development Financing Authority",
        "value": "11667531.40",
        "weight": "0.00372562",
        "shared": false
      },
      {
        "name": "City of Austin, Series 2025",
        "value": "11507168.86",
        "weight": "0.00367441",
        "shared": false
      },
      {
        "name": "City of Austin, Series 2025",
        "value": "11469816.04",
        "weight": "0.00366249",
        "shared": false
      },
      {
        "name": "Northampton County General Purpose Authority, Series A-2",
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        "weight": "0.00366128",
        "shared": false
      },
      {
        "name": "Massachusetts Development Finance Agency, Series 2026F",
        "value": "11409196.00",
        "weight": "0.00364313",
        "shared": false
      },
      {
        "name": "WVU HEALTH PUT B 5% 6/1/33 MT",
        "value": "11385789.45",
        "weight": "0.00363566",
        "shared": false
      },
      {
        "name": "COLBURN SCHOOL (MPT) 1.75% 08-01-55",
        "value": "11289160.84",
        "weight": "0.00360480",
        "shared": false
      },
      {
        "name": "Pennsylvania Economic Development Financing Authority, Series 2026B",
        "value": "11238910.00",
        "weight": "0.00358875",
        "shared": false
      },
      {
        "name": "MOBILE PCR AL PWR-C",
        "value": "11009978.10",
        "weight": "0.00351565",
        "shared": false
      },
      {
        "name": "Port Authority of New York & New Jersey, Series 246",
        "value": "10930428.00",
        "weight": "0.00349025",
        "shared": false
      },
      {
        "name": "City of Hibbing, Series 2025A",
        "value": "10927721.62",
        "weight": "0.00348939",
        "shared": false
      },
      {
        "name": "Washington Health Care Facilities Authority, Series C-2",
        "value": "10886922.00",
        "weight": "0.00347636",
        "shared": false
      },
      {
        "name": "Maricopa County Industrial Development Authority, Series 2026 D",
        "value": "10856226.00",
        "weight": "0.00346656",
        "shared": false
      },
      {
        "name": "California Community Choice Financing Authority, Series F",
        "value": "10814631.00",
        "weight": "0.00345328",
        "shared": false
      },
      {
        "name": "Chicago Midway International Airport, Series 2023A",
        "value": "10810245.00",
        "weight": "0.00345188",
        "shared": false
      },
      {
        "name": "WA ST HLTH CAR 5% 10/1/2030",
        "value": "10759831.00",
        "weight": "0.00343578",
        "shared": false
      }
    ],
    "b_top": [
      {
        "name": "Southeast Energy Authority, Alabama, Revenue Bonds Cooperative District Energy Supply Series 2024C",
        "value": "6372370.20",
        "weight": "0.01078087",
        "shared": true
      },
      {
        "name": "County of Utah UT",
        "value": "5000000.00",
        "weight": "0.00845907",
        "shared": false
      },
      {
        "name": "OH OHSDEV 11/01/2039",
        "value": "4805848.92",
        "weight": "0.00813060",
        "shared": true
      },
      {
        "name": "Wisconsin (State of) Public Finance Authority (Duke Energy Progress), Series 2022, Ref. RB",
        "value": "4281206.10",
        "weight": "0.00724301",
        "shared": false
      },
      {
        "name": "St. John the Baptist (Parish of), LA (Marathon Oil Corp.), Series 2017, Ref. RB",
        "value": "4026151.60",
        "weight": "0.00681150",
        "shared": false
      },
      {
        "name": "Main Street Energy, Inc., Series D",
        "value": "3895478.03",
        "weight": "0.00659043",
        "shared": false
      },
      {
        "name": "Palm Beach (County of), FL Health Facilities Authority (ACTS Retirement-Life Communities, Inc.), Series 2016, Ref. RB",
        "value": "3743929.08",
        "weight": "0.00633403",
        "shared": false
      },
      {
        "name": "NYC MUNI WTR FIN-BB",
        "value": "3500000.00",
        "weight": "0.00592135",
        "shared": false
      },
      {
        "name": "Public Energy Authority of Kentucky, Gas Supply Revenue Bonds, Refunding Series 2025A",
        "value": "3481712.58",
        "weight": "0.00589041",
        "shared": false
      },
      {
        "name": "Black Belt Energy Gas District",
        "value": "3440432.23",
        "weight": "0.00582057",
        "shared": false
      },
      {
        "name": "BLACK BELT ENERGY GAS VAR",
        "value": "3420591.24",
        "weight": "0.00578701",
        "shared": true
      },
      {
        "name": "NM MUNI ENERGY ACQ AU",
        "value": "3381642.53",
        "weight": "0.00572111",
        "shared": false
      },
      {
        "name": "NEW YORK ST HSG FIN AGY AFFORDABLE HSG REVENUE",
        "value": "3143053.75",
        "weight": "0.00531746",
        "shared": false
      },
      {
        "name": "LOS ANGELES CA DEPT OF ARPTS A REGD B/E AMT 5.00000000",
        "value": "3142415.10",
        "weight": "0.00531638",
        "shared": false
      },
      {
        "name": "ALLEGHENY HOSP DEV-A",
        "value": "3092031.90",
        "weight": "0.00523114",
        "shared": false
      },
      {
        "name": "WHITING IN ENVRNMNTL FACS REVE REGD V/R B/E AMT 5.00000000",
        "value": "3075758.09",
        "weight": "0.00520361",
        "shared": false
      },
      {
        "name": "MD CMNTY DEV-D-2",
        "value": "3035471.70",
        "weight": "0.00513545",
        "shared": false
      },
      {
        "name": "UNITED AIRLINES INC 4.0% 07-15-29",
        "value": "3018532.20",
        "weight": "0.00510680",
        "shared": false
      },
      {
        "name": "WASTE MANAGEMENT INC (MPT) 3.45% 11-01-44",
        "value": "3000298.80",
        "weight": "0.00507595",
        "shared": false
      },
      {
        "name": "NEW YORK NY REGD V/R B/E 2.65000000",
        "value": "3000000.00",
        "weight": "0.00507544",
        "shared": false
      },
      {
        "name": "NORTH CAROLINA ST HSG FIN AGYM REGD V/R B/E 5.00000000",
        "value": "2906436.68",
        "weight": "0.00491715",
        "shared": false
      },
      {
        "name": "TX TMGUTL 01/01/2054",
        "value": "2845828.47",
        "weight": "0.00481461",
        "shared": false
      },
      {
        "name": "FARM N MEX PCR 0% 6/1/2040 MT",
        "value": "2815916.35",
        "weight": "0.00476401",
        "shared": true
      },
      {
        "name": "Public Energy Authority of Kentucky, Gas Supply Revenue Bonds, Refunding Series 2024B",
        "value": "2731069.46",
        "weight": "0.00462046",
        "shared": false
      },
      {
        "name": "DFW ARPT 5% 11/1/2031 @",
        "value": "2725976.00",
        "weight": "0.00461185",
        "shared": false
      },
      {
        "name": "FLORIDA DEV FIN CORP HLTHCAREFACS REVENUE",
        "value": "2707992.75",
        "weight": "0.00458142",
        "shared": true
      },
      {
        "name": "City of Atlanta GA Department of Aviation",
        "value": "2697235.25",
        "weight": "0.00456322",
        "shared": false
      },
      {
        "name": "TN TNSUTL 05/01/2053",
        "value": "2573669.50",
        "weight": "0.00435417",
        "shared": true
      },
      {
        "name": "City of Philadelphia PA Airport Revenue",
        "value": "2566634.16",
        "weight": "0.00434227",
        "shared": false
      },
      {
        "name": "FAIRFAX C VA 5% 1/1/2045 MT",
        "value": "2555159.50",
        "weight": "0.00432286",
        "shared": false
      },
      {
        "name": "WASTE MANAGEMENT INC (MPT) 3.45% 10-01-41",
        "value": "2515175.25",
        "weight": "0.00425521",
        "shared": false
      },
      {
        "name": "NORTH BLOCK ASSOCIATES LLC HUD SECT 8 FHA 221(D)(4) (MPT) 3.4% 02-01-29",
        "value": "2511564.25",
        "weight": "0.00424910",
        "shared": true
      },
      {
        "name": "COUNTY OF TRIMBLE KY TRMENV 06/33 FIXED 3.75",
        "value": "2502465.75",
        "weight": "0.00423371",
        "shared": false
      },
      {
        "name": "ARKANSAS DEV FIN AUTH ENVIRONM REGD V/R B/E AMT 4.00000000",
        "value": "2495967.00",
        "weight": "0.00422271",
        "shared": false
      },
      {
        "name": "MOBILE PCR-VAR-AL PWR",
        "value": "2478086.00",
        "weight": "0.00419246",
        "shared": true
      },
      {
        "name": "MTRO WA DC ARPT 5% 10/1/2031 @",
        "value": "2455847.33",
        "weight": "0.00415484",
        "shared": false
      },
      {
        "name": "LEHIGH PA_IDA 3% 9/1/2029",
        "value": "2450784.00",
        "weight": "0.00414627",
        "shared": false
      },
      {
        "name": "INDIANAPOLIS IN LOCAL PUBLIC I REGD N/C B/E AMT 5.00000000",
        "value": "2438325.30",
        "weight": "0.00412519",
        "shared": false
      },
      {
        "name": "State of Illinois, Series C",
        "value": "2437731.08",
        "weight": "0.00412419",
        "shared": false
      },
      {
        "name": "NORTHWESTERN CORP 3.875% 07-01-28",
        "value": "2431955.57",
        "weight": "0.00411442",
        "shared": false
      },
      {
        "name": "HOUSTON-UTL SYS-B-REF",
        "value": "2424190.04",
        "weight": "0.00410128",
        "shared": false
      },
      {
        "name": "DE ST EDA 3.60% 1/1/31",
        "value": "2419505.95",
        "weight": "0.00409335",
        "shared": false
      },
      {
        "name": "PEFA INC VAR",
        "value": "2408907.05",
        "weight": "0.00407542",
        "shared": false
      },
      {
        "name": "TENNERGY CORP TN GAS REVENUE TENNERGY CORP/TN",
        "value": "2384879.46",
        "weight": "0.00403477",
        "shared": false
      },
      {
        "name": "NY TRANS CORP 5% 1/1/2032 @",
        "value": "2370014.59",
        "weight": "0.00400962",
        "shared": false
      },
      {
        "name": "SOUTHEAST ENERGY-F",
        "value": "2355034.34",
        "weight": "0.00398428",
        "shared": false
      },
      {
        "name": "SOUTHEAST ENERGY AUTH VAR",
        "value": "2342301.03",
        "weight": "0.00396274",
        "shared": false
      },
      {
        "name": "South Carolina Jobs-Economic Development Authority, Series 2023A",
        "value": "2313365.26",
        "weight": "0.00391378",
        "shared": true
      },
      {
        "name": "MTRO WA DC ARPT 5% 10/1/2035 @",
        "value": "2304524.08",
        "weight": "0.00389883",
        "shared": false
      },
      {
        "name": "NYC HSG DEV CORP-F-2A",
        "value": "2260772.92",
        "weight": "0.00382481",
        "shared": true
      }
    ]
  },
  "error": null,
  "sources": [
    {
      "label": "N-PORT (fund A)",
      "accession_no": "0002071691-26-015580",
      "as_of": "2026-04-30",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/63075/000207169126015580/0002071691-26-015580-index.htm"
    },
    {
      "label": "N-PORT (fund B)",
      "accession_no": "0000940400-26-025147",
      "as_of": "2026-04-30",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/1424212/000094040026025147/0000940400-26-025147-index.htm"
    }
  ]
}