{
  "page": "compare",
  "query": {
    "a": "TLMAX",
    "b": "FSMB"
  },
  "retrieved_at": "2026-07-07T16:49:26+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": "Thornburg Short Duration Municipal Fund",
    "ticker": "TLMAX",
    "slug": "TLMAX",
    "series_id": "S000043669",
    "html_url": "https://fundwatcher.app/funds/TLMAX/"
  },
  "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": {
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    "coverage_b_by_a": "0.04430487310634601084614732193",
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    "as_of": {
      "a": "2026-03-31",
      "b": "2026-04-30"
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        "name": "Chicago O'Hare International Airport",
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        "name": "TEXAS ST MUNI GAS ACQUISITION& SPLY CORP III GAS SPLY REVEN",
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      {
        "name": "California Community Choice Financing Authority, Series B-1",
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        "name": "WASTE MANAGEMENT PA OBLIGATED GROUP (MPT) 4.25% 07-01-41",
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        "name": "OHIO ST AIR QUALITY DEV AUTH REGD N/C B/E AMT 3.75000000",
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      {
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      {
        "name": "FLORIDA ST HSG FIN CORP MF MTGE REVENUE",
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      {
        "name": "TX AHC MF 3.625% MT",
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      {
        "name": "LEE FL IDA HLTH 4.375% 11/15/2029",
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        "name": "MAIN STREET MARKET SQUARE REDEVELOPMENT AUTHORITY",
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      {
        "name": "MAIKER HSG PARTNERS CO MF HSG REV",
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      {
        "name": "Development Authority of Burke County (The), Series 4",
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        "name": "WASTE MANAGEMENT INC (MPT) 3.45% 12-01-44",
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        "weight": "0.01090504",
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      {
        "name": "MIAMI-DADE MFH MT 4/1/2041",
        "value": "1000345.00",
        "weight": "0.01090330",
        "shared": false
      },
      {
        "name": "NY ST HSG FIN AGY",
        "value": "1000136.00",
        "weight": "0.01090102",
        "shared": false
      },
      {
        "name": "Knox Warren Etc Counties Community College District No. 518, Series 2025",
        "value": "1000000.00",
        "weight": "0.01089954",
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      },
      {
        "name": "MS BUS FIN-G-CHEVRON",
        "value": "1000000.00",
        "weight": "0.01089954",
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    ],
    "b_top": [
      {
        "name": "Southeast Energy Authority, Alabama, Revenue Bonds Cooperative District Energy Supply Series 2024C",
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      {
        "name": "County of Utah UT",
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      {
        "name": "OH OHSDEV 11/01/2039",
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      {
        "name": "Wisconsin (State of) Public Finance Authority (Duke Energy Progress), Series 2022, Ref. RB",
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        "name": "NYC MUNI WTR FIN-BB",
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      },
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        "name": "Black Belt Energy Gas District",
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      {
        "name": "BLACK BELT ENERGY GAS VAR",
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      {
        "name": "NM MUNI ENERGY ACQ AU",
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        "weight": "0.00572111",
        "shared": false
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      {
        "name": "NEW YORK ST HSG FIN AGY AFFORDABLE HSG REVENUE",
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      {
        "name": "LOS ANGELES CA DEPT OF ARPTS A REGD B/E AMT 5.00000000",
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      },
      {
        "name": "ALLEGHENY HOSP DEV-A",
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      },
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        "name": "WHITING IN ENVRNMNTL FACS REVE REGD V/R B/E AMT 5.00000000",
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      {
        "name": "UNITED AIRLINES INC 4.0% 07-15-29",
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        "weight": "0.00510680",
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      {
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      {
        "name": "NEW YORK NY REGD V/R B/E 2.65000000",
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      {
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      {
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      {
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      {
        "name": "DFW ARPT 5% 11/1/2031 @",
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      {
        "name": "FLORIDA DEV FIN CORP HLTHCAREFACS REVENUE",
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        "shared": false
      },
      {
        "name": "City of Atlanta GA Department of Aviation",
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      {
        "name": "TN TNSUTL 05/01/2053",
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      {
        "name": "City of Philadelphia PA Airport Revenue",
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      {
        "name": "FAIRFAX C VA 5% 1/1/2045 MT",
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      },
      {
        "name": "WASTE MANAGEMENT INC (MPT) 3.45% 10-01-41",
        "value": "2515175.25",
        "weight": "0.00425521",
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      {
        "name": "NORTH BLOCK ASSOCIATES LLC HUD SECT 8 FHA 221(D)(4) (MPT) 3.4% 02-01-29",
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        "weight": "0.00424910",
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        "name": "COUNTY OF TRIMBLE KY TRMENV 06/33 FIXED 3.75",
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      {
        "name": "ARKANSAS DEV FIN AUTH ENVIRONM REGD V/R B/E AMT 4.00000000",
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      },
      {
        "name": "MOBILE PCR-VAR-AL PWR",
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      {
        "name": "MTRO WA DC ARPT 5% 10/1/2031 @",
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      {
        "name": "LEHIGH PA_IDA 3% 9/1/2029",
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      {
        "name": "INDIANAPOLIS IN LOCAL PUBLIC I REGD N/C B/E AMT 5.00000000",
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      {
        "name": "State of Illinois, Series C",
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        "name": "HOUSTON-UTL SYS-B-REF",
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      {
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      {
        "name": "PEFA INC VAR",
        "value": "2408907.05",
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        "shared": true
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      {
        "name": "TENNERGY CORP TN GAS REVENUE TENNERGY CORP/TN",
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      {
        "name": "NY TRANS CORP 5% 1/1/2032 @",
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      {
        "name": "SOUTHEAST ENERGY-F",
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      {
        "name": "SOUTHEAST ENERGY AUTH VAR",
        "value": "2342301.03",
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      },
      {
        "name": "South Carolina Jobs-Economic Development Authority, Series 2023A",
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      {
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    ]
  },
  "error": null,
  "sources": [
    {
      "label": "N-PORT (fund A)",
      "accession_no": "0001410368-26-051187",
      "as_of": "2026-03-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/816153/000141036826051187/0001410368-26-051187-index.htm"
    },
    {
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      "accession_no": "0000940400-26-025147",
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      "edgar_url": "https://www.sec.gov/Archives/edgar/data/1424212/000094040026025147/0000940400-26-025147-index.htm"
    }
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}