{
  "page": "compare",
  "query": {
    "a": "SUB",
    "b": "MUB"
  },
  "retrieved_at": "2026-07-07T18:08:46+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": "iShares Short-Term National Muni Bond ETF",
    "ticker": "SUB",
    "slug": "SUB",
    "series_id": "S000023507",
    "html_url": "https://fundwatcher.app/funds/SUB/"
  },
  "fund_b": {
    "name": "iShares National Muni Bond ETF",
    "ticker": "MUB",
    "slug": "MUB",
    "series_id": "S000018861",
    "html_url": "https://fundwatcher.app/funds/MUB/"
  },
  "overlap": {
    "coverage_a_by_b": "0.08481983791877368268816569173",
    "coverage_b_by_a": "0.08481983791877368268816569172",
    "shared_count": 539,
    "as_of": {
      "a": "2026-02-28",
      "b": "2026-02-28"
    },
    "a_top": [
      {
        "name": "BLKR-LI MUNI-INS",
        "value": "108299651.03",
        "weight": "0.00993702",
        "shared": true
      },
      {
        "name": "STATE OF NEW JERSEY 5.0% 03-01-28",
        "value": "41740384.86",
        "weight": "0.00382988",
        "shared": true
      },
      {
        "name": "WA KINUTL 01/01/2042",
        "value": "39115000.00",
        "weight": "0.00358899",
        "shared": false
      },
      {
        "name": "STATE OF CALIFORNIA 5.0% 08-01-29",
        "value": "31460849.26",
        "weight": "0.00288669",
        "shared": false
      },
      {
        "name": "NEW YORK ST URBAN DEV CORP REVENUE",
        "value": "28844324.30",
        "weight": "0.00264661",
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      },
      {
        "name": "UNIV OF CALIFORNIA CA REVENUES REGD N/C B/E 5.00000000",
        "value": "28543197.50",
        "weight": "0.00261898",
        "shared": true
      },
      {
        "name": "NJ TPK AUTH-B",
        "value": "28388156.48",
        "weight": "0.00260475",
        "shared": false
      },
      {
        "name": "Pennsylvania Turnpike Commission, Series 2023B",
        "value": "27945000.00",
        "weight": "0.00256409",
        "shared": false
      },
      {
        "name": "State of California",
        "value": "27419560.16",
        "weight": "0.00251588",
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      {
        "name": "STATE OF CALIFORNIA 5.0% 11-01-27",
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      },
      {
        "name": "Empire State Development Corp., Series 2021A",
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      },
      {
        "name": "DT OF COLUMBIA-C-2",
        "value": "25000000.00",
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      },
      {
        "name": "Connecticut State Health & Educational Facilities Authority, Series 2017C-4",
        "value": "25000000.00",
        "weight": "0.00229387",
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      },
      {
        "name": "CONNECTICUT ST SPL TAX OBLIG REVENUE",
        "value": "24373832.63",
        "weight": "0.00223642",
        "shared": false
      },
      {
        "name": "NY TRANS FIN AUTH-D-1",
        "value": "24144848.30",
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      },
      {
        "name": "NEW YORK B-1-REF",
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      },
      {
        "name": "State of New Jersey, Series A",
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      {
        "name": "MA ST-REF-A",
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      },
      {
        "name": "HOUSTON TX UTILITY SYS REVENUE CITY OF HOUSTON TX COMBINED UTILITY SYSTEM REVENUE",
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      },
      {
        "name": "CT HLTH & EDUCTNL-B-1",
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        "name": "KING CNTY WA SWR REVENUE COUNTY OF KING WA SEWER REVENUE",
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        "name": "Ohio Water Development Authority, Series 2018",
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        "name": "State of New Jersey, Series 2020A",
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      {
        "name": "Kentucky State Property & Building Commission, Series B",
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        "name": "MINNESOTA ST PUBLIC FACS AUTH REVOLVING FUND REVENUE",
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      {
        "name": "City of Seattle, Series 2023B",
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      {
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      {
        "name": "COLORADO ST EDUC LOAN PROGRAM",
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      {
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      {
        "name": "E CO AWP JT PWRS-A-1",
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      {
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      {
        "name": "Houston (City of), TX, Series 2016 A, Ref. GO Bonds",
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      {
        "name": "SOUTH CAROLINA ST PUBLIC SVC AUTH REVENUE",
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      {
        "name": "State of Washington, Series 2022C",
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        "name": "UNIV OF CALIFORNIA CA REVENUES",
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      {
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      {
        "name": "New York State Dormitory Authority, State Personal Income Tax, Series 2021E",
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      {
        "name": "Virginia (Commonwealth of) College Building Authority (21st Century College and Equipment Programs), Series 2017, Ref. RB",
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      },
      {
        "name": "State of Minnesota, Series 2023E",
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      {
        "name": "University of California, Series 2025, RB",
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        "weight": "0.00168656",
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      },
      {
        "name": "State of Illinois, Series D",
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      {
        "name": "FT BEND TX ISD 4% 8/1/2054",
        "value": "18275213.14",
        "weight": "0.00167684",
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      },
      {
        "name": "Long Island Power Authority, Series 2025C",
        "value": "18250000.00",
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        "value": "17881170.58",
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    "b_top": [
      {
        "name": "BLKR-LI MUNI-INS",
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      {
        "name": "UNIV OF TEXAS TX UNIV REVENUES UNIHGR 08/36 FIXED 5",
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      {
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        "name": "NYS TWY PIT 5% 3/15/2048",
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      },
      {
        "name": "HOUSTON TX HGR EDU FIN CORP REGD N/C B/E 5.00000000",
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      {
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      {
        "name": "OHIO ST UNIV REGD N/C B/E 5.00000000",
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      },
      {
        "name": "STATE OF CALIFORNIA 5.0% 09-01-31",
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        "name": "State of New Jersey, Series 2020A",
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      {
        "name": "Pennsylvania Turnpike Commission, Series 2019-2",
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      {
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      {
        "name": "NJ EDUCTNL FACS AUTH",
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        "name": "Washoe County School District, Series 2017C",
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      {
        "name": "NEW YORK NY",
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        "name": "CALIFORNIA ST EDUCTNL FACS AUTH REVENUE",
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      {
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        "name": "Triborough Bridge & Tunnel Authority, Series 2024A",
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      },
      {
        "name": "NJ TRN FD CAB-SER C",
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      },
      {
        "name": "Los Angeles Unified School District, Series 2020 RYQ, GO Bonds",
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      },
      {
        "name": "UNIV OF CA REGENTS",
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      },
      {
        "name": "NY ST UDC PIT REV 20A SF 4.0% 03-15-49",
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      },
      {
        "name": "NYC WTR 5% 6/15/48",
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      {
        "name": "PENNSYLVANIA CMWLTH",
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      },
      {
        "name": "TRIBOROUGH NY BRIDGE   TUNNEL TRBTRN 05/51 FIXED 5",
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      {
        "name": "New York State Thruway Authority, Series 2021A-1",
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      },
      {
        "name": "UNIV OF CA REGENTS",
        "value": "37879553.00",
        "weight": "0.00088073",
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      },
      {
        "name": "PROSPER TX INDEP SCH DIST REGD OID B/E PSF-GTD 4.00000000",
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      },
      {
        "name": "Ector County, Texas, Certificates of Obligation, Series 2024",
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    ]
  },
  "error": null,
  "sources": [
    {
      "label": "N-PORT (fund A)",
      "accession_no": "0002071691-26-008202",
      "as_of": "2026-02-28",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/1100663/000207169126008202/0002071691-26-008202-index.htm"
    },
    {
      "label": "N-PORT (fund B)",
      "accession_no": "0002071691-26-008205",
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      "edgar_url": "https://www.sec.gov/Archives/edgar/data/1100663/000207169126008205/0002071691-26-008205-index.htm"
    }
  ]
}