{
  "page": "compare",
  "query": {
    "a": "IBB",
    "b": "PRHSX"
  },
  "retrieved_at": "2026-07-07T18:27:16+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 Biotechnology ETF",
    "ticker": "IBB",
    "slug": "IBB",
    "series_id": "S000004350",
    "html_url": "https://fundwatcher.app/funds/IBB/"
  },
  "fund_b": {
    "name": "T. Rowe Price Health Sciences Fund, Inc.",
    "ticker": "PRHSX",
    "slug": "PRHSX",
    "series_id": "S000002088",
    "html_url": "https://fundwatcher.app/funds/PRHSX/"
  },
  "overlap": {
    "coverage_a_by_b": "0.3308547959990583460349857263",
    "coverage_b_by_a": "0.3308547959990583460349857263",
    "shared_count": 95,
    "as_of": {
      "a": "2026-03-31",
      "b": "2026-03-31"
    },
    "a_top": [
      {
        "name": "BlackRock Cash Funds: Institutional, SL Agency Shares",
        "value": "784812698.34",
        "weight": "0.08809101",
        "shared": false
      },
      {
        "name": "GILEAD SCIENCES INC",
        "value": "629354084.59",
        "weight": "0.07064162",
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      },
      {
        "name": "AMGEN INC",
        "value": "609808123.80",
        "weight": "0.06844769",
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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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      {
        "name": "ALNYLAM PHARMACEUTICALS INC",
        "value": "324134148.54",
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      },
      {
        "name": "INSMED INC",
        "value": "259651282.24",
        "weight": "0.02914446",
        "shared": true
      },
      {
        "name": "ARGENX SE SPONSORED ADR",
        "value": "249660060.75",
        "weight": "0.02802300",
        "shared": true
      },
      {
        "name": "BIOGEN INC",
        "value": "200021463.18",
        "weight": "0.02245134",
        "shared": false
      },
      {
        "name": "NATERA INC",
        "value": "196114593.78",
        "weight": "0.02201281",
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      },
      {
        "name": "UNITED THERAPEUTICS CORP DEL",
        "value": "187090526.82",
        "weight": "0.02099991",
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      },
      {
        "name": "BEONE MEDICINES LTD ADR",
        "value": "157139596.71",
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      },
      {
        "name": "INCYTE CORP",
        "value": "138160912.76",
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      },
      {
        "name": "MODERNA INC",
        "value": "136776917.20",
        "weight": "0.01535247",
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      },
      {
        "name": "ILLUMINA INC",
        "value": "136484688.66",
        "weight": "0.01531967",
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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",
        "weight": "0.01132535",
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      },
      {
        "name": "NEUROCRINE BIOSCIENCES INC",
        "value": "95841113.48",
        "weight": "0.01075765",
        "shared": false
      },
      {
        "name": "GENMAB A/S -SP ADR DEPOSITARY RECEIPT",
        "value": "95383279.34",
        "weight": "0.01070626",
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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",
        "weight": "0.00915858",
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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",
        "weight": "0.00872773",
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      },
      {
        "name": "PRAXIS PRECISION MEDICINES INC",
        "value": "62858302.43",
        "weight": "0.00705551",
        "shared": true
      },
      {
        "name": "CHARLES RIVER LABS INTL INC",
        "value": "62473462.50",
        "weight": "0.00701231",
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      },
      {
        "name": "ARROWHEAD PHARMACEUTICALS INC",
        "value": "61143472.50",
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      },
      {
        "name": "VAXCYTE INC",
        "value": "60765336.45",
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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",
        "value": "46762286.72",
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      {
        "name": "KYMERA THERAPEUTICS INC",
        "value": "43426156.65",
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      },
      {
        "name": "ALKERMES PLC",
        "value": "43021168.32",
        "weight": "0.00482890",
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      },
      {
        "name": "RHYTHM PHARMACEUTICALS INC",
        "value": "41270656.83",
        "weight": "0.00463241",
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      },
      {
        "name": "Abivax SA SPONSORED ADS",
        "value": "40916782.35",
        "weight": "0.00459269",
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      },
      {
        "name": "PTC THERAPEUTICS INC",
        "value": "40411445.76",
        "weight": "0.00453597",
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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",
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      },
      {
        "name": "TEMPUS AI INC-A",
        "value": "34996029.32",
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      },
      {
        "name": "XENON PHARMACEUTICALS INC",
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    ],
    "b_top": [
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        "name": "LILLY ELI and CO",
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      {
        "name": "THERMO FISHER SCIENTIFIC INC",
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      {
        "name": "INTUITIVE SURGICAL INC",
        "value": "397936248.79",
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      {
        "name": "STRYKER CORP",
        "value": "377064253.98",
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      {
        "name": "MERCK & CO",
        "value": "374870793.68",
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      {
        "name": "ASTRAZENECA PLC",
        "value": "345378566.70",
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      {
        "name": "UNITEDHEALTH GRP",
        "value": "336306840.35",
        "weight": "0.03088758",
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      {
        "name": "ARGENX SE SPONSORED ADR",
        "value": "317885127.50",
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      {
        "name": "ABBVIE INC",
        "value": "309562434.09",
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      {
        "name": "REGENERON PHARMACEUTICALS INC",
        "value": "288369336.64",
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      {
        "name": "GILEAD SCIENCES INC",
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      {
        "name": "JOHNSON&JOHNSON",
        "value": "266037496.20",
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      {
        "name": "VERTEX PHARMACEUTICALS INC",
        "value": "264036869.30",
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      {
        "name": "DANAHER CORP",
        "value": "222869301.60",
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      {
        "name": "ALNYLAM PHARMACEUTICALS INC",
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        "name": "Ascendis Pharma A/S",
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      {
        "name": "REVOLUTION MEDICINES INC",
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      {
        "name": "UNITED THERAPEUTICS CORP DEL",
        "value": "146432260.14",
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      },
      {
        "name": "BEONE MEDICINE-H",
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      {
        "name": "ROIVANT SCIENCES LTD",
        "value": "123200542.10",
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      {
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        "name": "SUMMIT THERAPEUTICS INC",
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      {
        "name": "TENET HEALTHCARE CORP",
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      {
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      {
        "name": "BOSTON SCIENTIFIC CORP",
        "value": "100636630.25",
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      {
        "name": "HCA HEALTHCARE INC",
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      {
        "name": "GUARDANT HEALTH INC",
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      },
      {
        "name": "CVS HEALTH CORP",
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      },
      {
        "name": "KYMERA THERAPEUTICS INC",
        "value": "83487147.43",
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      },
      {
        "name": "THE CIGNA GROUP",
        "value": "80106092.00",
        "weight": "0.00735722",
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      },
      {
        "name": "CG ONCOLOGY INC",
        "value": "75028220.64",
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      },
      {
        "name": "CARDINAL HEALTH INC",
        "value": "73584903.92",
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      },
      {
        "name": "ELEVANCE HEALTH INC",
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      },
      {
        "name": "KRYSTAL BIOTECH INC",
        "value": "70637862.32",
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      },
      {
        "name": "SCHOLAR ROCK HOLDING CORP",
        "value": "67338384.80",
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      },
      {
        "name": "IONIS PHARMACEUTICALS INC",
        "value": "66291179.07",
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      {
        "name": "BRIDGEBIO PHARMA INC",
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      },
      {
        "name": "CHUGAI PHARMA CO",
        "value": "62924419.81",
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      {
        "name": "STRUCTURE THERAPEUTICS INC ADR",
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      {
        "name": "PRAXIS PRECISION MEDICINES INC",
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      },
      {
        "name": "CELCUITY INC",
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      {
        "name": "ROYALTY PHARMA PLC",
        "value": "59566411.71",
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      },
      {
        "name": "CENCORA INC",
        "value": "56456298.38",
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      },
      {
        "name": "CENTESSA PHARMACEUTICALS LTD ADR",
        "value": "54320158.44",
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      },
      {
        "name": "VERA THERAPEUTICS INC",
        "value": "49716475.38",
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      },
      {
        "name": "NUVALENT INC-A",
        "value": "47105587.95",
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      },
      {
        "name": "APOGEE THERAPEUTICS INC",
        "value": "46722598.66",
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    ]
  },
  "error": null,
  "sources": [
    {
      "label": "N-PORT (fund A)",
      "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"
    },
    {
      "label": "N-PORT (fund B)",
      "accession_no": "0001099263-26-006598",
      "as_of": "2026-03-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/1002624/000109926326006598/0001099263-26-006598-index.htm"
    }
  ]
}