{
  "page": "compare",
  "query": {
    "a": "FBT",
    "b": "IBB"
  },
  "retrieved_at": "2026-07-07T18:42:42+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": "First Trust NYSE Arca Biotechnology Index Fund",
    "ticker": "FBT",
    "slug": "FBT",
    "series_id": "S000012478",
    "html_url": "https://fundwatcher.app/funds/FBT/"
  },
  "fund_b": {
    "name": "iShares Biotechnology ETF",
    "ticker": "IBB",
    "slug": "IBB",
    "series_id": "S000004350",
    "html_url": "https://fundwatcher.app/funds/IBB/"
  },
  "overlap": {
    "coverage_a_by_b": "0.4247722602655743585163659893",
    "coverage_b_by_a": "0.4247722602655743585163659895",
    "shared_count": 28,
    "as_of": {
      "a": "2026-03-31",
      "b": "2026-03-31"
    },
    "a_top": [
      {
        "name": "MODERNA INC",
        "value": "119445481.20",
        "weight": "0.05258157",
        "shared": true
      },
      {
        "name": "UNITED THERAPEUTICS CORP DEL",
        "value": "98938120.02",
        "weight": "0.04355394",
        "shared": true
      },
      {
        "name": "ALKERMES PLC",
        "value": "96146103.04",
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      },
      {
        "name": "GILEAD SCIENCES INC",
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      },
      {
        "name": "AXSOME THERAPEUTICS INC",
        "value": "88207819.56",
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      },
      {
        "name": "AMGEN INC",
        "value": "87006523.55",
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      },
      {
        "name": "CORCEPT THERAPEUTICS INC",
        "value": "86691734.06",
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      },
      {
        "name": "KRYSTAL BIOTECH INC",
        "value": "79692753.28",
        "weight": "0.03508186",
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      },
      {
        "name": "BIOGEN INC",
        "value": "78804950.49",
        "weight": "0.03469104",
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      },
      {
        "name": "EXELIXIS INC",
        "value": "78543170.30",
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      },
      {
        "name": "NEUROCRINE BIOSCIENCES INC",
        "value": "78243811.24",
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      },
      {
        "name": "REGENERON PHARMACEUTICALS INC",
        "value": "78229027.36",
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      },
      {
        "name": "VERTEX PHARMACEUTICALS INC",
        "value": "77623834.36",
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      },
      {
        "name": "BIOMARIN PHARMACEUTICAL INC",
        "value": "77280579.60",
        "weight": "0.03401999",
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      },
      {
        "name": "ARGENX SE SPONSORED ADR",
        "value": "74722831.25",
        "weight": "0.03289403",
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      },
      {
        "name": "SAREPTA THERAPEUTICS INC",
        "value": "73643325.44",
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      },
      {
        "name": "HALOZYME THERAPEUTICS INC",
        "value": "71923043.09",
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      },
      {
        "name": "BIONTECH SE ADR",
        "value": "71789353.68",
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      },
      {
        "name": "INCYTE CORP",
        "value": "71025869.72",
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      },
      {
        "name": "BEONE MEDICINES LTD ADR",
        "value": "70878423.84",
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      },
      {
        "name": "ILLUMINA INC",
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      },
      {
        "name": "NATERA INC",
        "value": "68836158.02",
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      {
        "name": "ACADIA PHARMACEUTICALS INC",
        "value": "67035878.70",
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      {
        "name": "ALNYLAM PHARMACEUTICALS INC",
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      },
      {
        "name": "BIO-TECHNE CORP",
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      },
      {
        "name": "GENMAB A/S -SP ADR DEPOSITARY RECEIPT",
        "value": "63158329.77",
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      },
      {
        "name": "VERACYTE INC",
        "value": "61789763.61",
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      },
      {
        "name": "REPLIGEN CORP",
        "value": "56958076.06",
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      },
      {
        "name": "BRUKER CORP",
        "value": "53490938.76",
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      },
      {
        "name": "NEOGENOMICS INC",
        "value": "45471822.76",
        "weight": "0.02001733",
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      },
      {
        "name": "DREY-GVT CSH-I",
        "value": "1413994.11",
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      },
      {
        "name": "DAIWA CAPITAL MARKETS AMERICA INC",
        "value": "188488.00",
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    ],
    "b_top": [
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        "name": "BlackRock Cash Funds: Institutional, SL Agency Shares",
        "value": "784812698.34",
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      },
      {
        "name": "GILEAD SCIENCES INC",
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      },
      {
        "name": "AMGEN INC",
        "value": "609808123.80",
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      },
      {
        "name": "VERTEX PHARMACEUTICALS INC",
        "value": "604629895.82",
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      },
      {
        "name": "REGENERON PHARMACEUTICALS INC",
        "value": "585840372.48",
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      },
      {
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        "value": "324134148.54",
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      },
      {
        "name": "INSMED INC",
        "value": "259651282.24",
        "weight": "0.02914446",
        "shared": false
      },
      {
        "name": "ARGENX SE SPONSORED ADR",
        "value": "249660060.75",
        "weight": "0.02802300",
        "shared": true
      },
      {
        "name": "BIOGEN INC",
        "value": "200021463.18",
        "weight": "0.02245134",
        "shared": true
      },
      {
        "name": "NATERA INC",
        "value": "196114593.78",
        "weight": "0.02201281",
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      },
      {
        "name": "UNITED THERAPEUTICS CORP DEL",
        "value": "187090526.82",
        "weight": "0.02099991",
        "shared": true
      },
      {
        "name": "BEONE MEDICINES LTD ADR",
        "value": "157139596.71",
        "weight": "0.01763808",
        "shared": true
      },
      {
        "name": "INCYTE CORP",
        "value": "138160912.76",
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      },
      {
        "name": "MODERNA INC",
        "value": "136776917.20",
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      },
      {
        "name": "ILLUMINA INC",
        "value": "136484688.66",
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      },
      {
        "name": "REVOLUTION MEDICINES INC",
        "value": "124860442.00",
        "weight": "0.01401491",
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      },
      {
        "name": "ROIVANT SCIENCES LTD",
        "value": "100898828.90",
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      },
      {
        "name": "NEUROCRINE BIOSCIENCES INC",
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      {
        "name": "GENMAB A/S -SP ADR DEPOSITARY RECEIPT",
        "value": "95383279.34",
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      },
      {
        "name": "BRIDGEBIO PHARMA INC",
        "value": "91984896.62",
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      {
        "name": "IONIS PHARMACEUTICALS INC",
        "value": "90524674.41",
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      {
        "name": "MEDPACE HOLDINGS INC",
        "value": "81594845.18",
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      {
        "name": "MADRIGAL PHARMACEUTICALS INC",
        "value": "81316353.27",
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      {
        "name": "EXELIXIS INC",
        "value": "80261172.14",
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      },
      {
        "name": "BIOMARIN PHARMACEUTICAL INC",
        "value": "79782521.70",
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      {
        "name": "Ascendis Pharma A/S",
        "value": "77756306.04",
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      {
        "name": "PRAXIS PRECISION MEDICINES INC",
        "value": "62858302.43",
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      },
      {
        "name": "CHARLES RIVER LABS INTL INC",
        "value": "62473462.50",
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      {
        "name": "ARROWHEAD PHARMACEUTICALS INC",
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      },
      {
        "name": "VAXCYTE INC",
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      },
      {
        "name": "BIO-TECHNE CORP",
        "value": "60200907.00",
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      },
      {
        "name": "CYTOKINETICS INC",
        "value": "59119424.52",
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      },
      {
        "name": "HALOZYME THERAPEUTICS INC",
        "value": "56131284.26",
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      },
      {
        "name": "AXSOME THERAPEUTICS INC",
        "value": "53932253.76",
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      },
      {
        "name": "BIONTECH SE ADR",
        "value": "53284093.28",
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      },
      {
        "name": "KRYSTAL BIOTECH INC",
        "value": "48813697.12",
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      },
      {
        "name": "PROTAGONIST THERAPEUTICS INC",
        "value": "47118753.80",
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      {
        "name": "REPLIGEN CORP",
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      },
      {
        "name": "KYMERA THERAPEUTICS INC",
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      },
      {
        "name": "ALKERMES PLC",
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      {
        "name": "RHYTHM PHARMACEUTICALS INC",
        "value": "41270656.83",
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      {
        "name": "Abivax SA SPONSORED ADS",
        "value": "40916782.35",
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      },
      {
        "name": "PTC THERAPEUTICS INC",
        "value": "40411445.76",
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      {
        "name": "COGENT BIOSCIENCES INC",
        "value": "38851652.04",
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      },
      {
        "name": "ARCELLX INC",
        "value": "38558163.48",
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      },
      {
        "name": "TERNS PHARMACEUTICALS INC",
        "value": "37634066.56",
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      },
      {
        "name": "NUVALENT INC-A",
        "value": "36419028.45",
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      },
      {
        "name": "MIRUM PHARMACEUTICALS INC",
        "value": "36275501.26",
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      },
      {
        "name": "TEMPUS AI INC-A",
        "value": "34996029.32",
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      },
      {
        "name": "XENON PHARMACEUTICALS INC",
        "value": "34796378.50",
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      }
    ]
  },
  "error": null,
  "sources": [
    {
      "label": "N-PORT (fund A)",
      "accession_no": "0000940400-26-021488",
      "as_of": "2026-03-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/1329377/000094040026021488/0000940400-26-021488-index.htm"
    },
    {
      "label": "N-PORT (fund B)",
      "accession_no": "0002071691-26-012466",
      "as_of": "2026-03-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/1100663/000207169126012466/0002071691-26-012466-index.htm"
    }
  ]
}