{
  "page": "compare",
  "query": {
    "a": "VMCIX",
    "b": "FSMDX"
  },
  "retrieved_at": "2026-07-07T18:46:01+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": "VANGUARD MID-CAP INDEX FUND",
    "ticker": "VMCIX",
    "slug": "VMCIX",
    "series_id": "S000002844",
    "html_url": "https://fundwatcher.app/funds/VMCIX/"
  },
  "fund_b": {
    "name": "Fidelity Mid Cap Index Fund",
    "ticker": "FSMDX",
    "slug": "FSMDX",
    "series_id": "S000033637",
    "html_url": "https://fundwatcher.app/funds/FSMDX/"
  },
  "overlap": {
    "coverage_a_by_b": "0.5527652127828116930241230446",
    "coverage_b_by_a": "0.5527652127828116930241230446",
    "shared_count": 231,
    "as_of": {
      "a": "2026-03-31",
      "b": "2026-01-31"
    },
    "a_top": [
      {
        "name": "VERTIV HOLDINGS CO",
        "value": "2034132514.26",
        "weight": "0.01025271",
        "shared": true
      },
      {
        "name": "HOWMET AEROSPACE INC",
        "value": "1995498751.44",
        "weight": "0.01005798",
        "shared": true
      },
      {
        "name": "WESTERN DIGITAL CORP",
        "value": "1980513444.03",
        "weight": "0.00998245",
        "shared": true
      },
      {
        "name": "CONSTELLATION ENERGY CORP",
        "value": "1857494206.25",
        "weight": "0.00936239",
        "shared": false
      },
      {
        "name": "SEAGATE TECHNOLO",
        "value": "1845017225.60",
        "weight": "0.00929950",
        "shared": false
      },
      {
        "name": "QUANTA SVCS INC",
        "value": "1774009345.58",
        "weight": "0.00894160",
        "shared": true
      },
      {
        "name": "SLB LTD",
        "value": "1659575195.82",
        "weight": "0.00836481",
        "shared": false
      },
      {
        "name": "CUMMINS INC",
        "value": "1605368824.92",
        "weight": "0.00809159",
        "shared": true
      },
      {
        "name": "VALERO ENERGY CORP",
        "value": "1595622379.44",
        "weight": "0.00804247",
        "shared": true
      },
      {
        "name": "PHILLIPS 66",
        "value": "1576714703.44",
        "weight": "0.00794717",
        "shared": true
      },
      {
        "name": "MARATHON PETROLEUM CORP",
        "value": "1554302395.28",
        "weight": "0.00783420",
        "shared": true
      },
      {
        "name": "MOTOROLA SOLUTIONS INC",
        "value": "1552569770.09",
        "weight": "0.00782547",
        "shared": false
      },
      {
        "name": "CRH PLC",
        "value": "1517061565.44",
        "weight": "0.00764650",
        "shared": false
      },
      {
        "name": "ROSS STORES INC",
        "value": "1513180479.96",
        "weight": "0.00762693",
        "shared": true
      },
      {
        "name": "GENERAL MOTORS CO",
        "value": "1454411424.50",
        "weight": "0.00733072",
        "shared": false
      },
      {
        "name": "ROYAL CARIBBEAN",
        "value": "1446945146.86",
        "weight": "0.00729309",
        "shared": false
      },
      {
        "name": "TRANSDIGM GROUP INC",
        "value": "1413489636.24",
        "weight": "0.00712446",
        "shared": false
      },
      {
        "name": "WARNER BROS DISCOVERY INC",
        "value": "1397116964.68",
        "weight": "0.00704194",
        "shared": true
      },
      {
        "name": "L3HARRIS TECHNOLOGIES INC",
        "value": "1392212571.75",
        "weight": "0.00701722",
        "shared": true
      },
      {
        "name": "CLOUDFLARE INC-A",
        "value": "1344422713.80",
        "weight": "0.00677634",
        "shared": true
      },
      {
        "name": "DIGITAL REALTY TRUST INC",
        "value": "1337304530.52",
        "weight": "0.00674046",
        "shared": true
      },
      {
        "name": "TE CONNECTIVITY",
        "value": "1324573535.32",
        "weight": "0.00667629",
        "shared": false
      },
      {
        "name": "PACCAR INC",
        "value": "1311770922.00",
        "weight": "0.00661176",
        "shared": false
      },
      {
        "name": "BAKER HUGHES CO",
        "value": "1302947781.30",
        "weight": "0.00656729",
        "shared": true
      },
      {
        "name": "NEWMONT CORP",
        "value": "1271616647.00",
        "weight": "0.00640937",
        "shared": false
      },
      {
        "name": "CENCORA INC",
        "value": "1253750331.84",
        "weight": "0.00631932",
        "shared": true
      },
      {
        "name": "CORTEVA INC",
        "value": "1234763350.48",
        "weight": "0.00622362",
        "shared": true
      },
      {
        "name": "REALTY INCOME CORP REIT",
        "value": "1231961531.78",
        "weight": "0.00620950",
        "shared": true
      },
      {
        "name": "ONEOK INC",
        "value": "1229443562.16",
        "weight": "0.00619681",
        "shared": true
      },
      {
        "name": "CHENIERE ENERGY INC",
        "value": "1223772603.28",
        "weight": "0.00616822",
        "shared": true
      },
      {
        "name": "ARTHUR J GALLAGHAR AND CO",
        "value": "1202549404.42",
        "weight": "0.00606125",
        "shared": false
      },
      {
        "name": "TARGET CORP",
        "value": "1185204982.80",
        "weight": "0.00597383",
        "shared": false
      },
      {
        "name": "ROBINHOOD MARKETS INC",
        "value": "1182414825.90",
        "weight": "0.00595977",
        "shared": true
      },
      {
        "name": "DOMINION ENERGY INC",
        "value": "1173251797.30",
        "weight": "0.00591358",
        "shared": false
      },
      {
        "name": "TARGA RESOURCES CORP",
        "value": "1163967890.68",
        "weight": "0.00586679",
        "shared": true
      },
      {
        "name": "ALLSTATE CORPORATION",
        "value": "1162142566.06",
        "weight": "0.00585759",
        "shared": true
      },
      {
        "name": "FASTENAL CO",
        "value": "1150687473.60",
        "weight": "0.00579985",
        "shared": true
      },
      {
        "name": "CORNING INC",
        "value": "1133693521.37",
        "weight": "0.00571419",
        "shared": true
      },
      {
        "name": "DOORDASH INC-A",
        "value": "1129982503.65",
        "weight": "0.00569549",
        "shared": false
      },
      {
        "name": "ELECTRONIC ARTS INC",
        "value": "1101789931.25",
        "weight": "0.00555339",
        "shared": true
      },
      {
        "name": "VISTRA CORP",
        "value": "1100044735.89",
        "weight": "0.00554459",
        "shared": true
      },
      {
        "name": "ENTERGY CORP",
        "value": "1099197767.56",
        "weight": "0.00554032",
        "shared": true
      },
      {
        "name": "MONOLITHIC POWER SYS INC",
        "value": "1092617455.50",
        "weight": "0.00550716",
        "shared": true
      },
      {
        "name": "CARDINAL HEALTH INC",
        "value": "1073857134.24",
        "weight": "0.00541260",
        "shared": true
      },
      {
        "name": "XCEL ENERGY INC",
        "value": "1070317601.52",
        "weight": "0.00539476",
        "shared": true
      },
      {
        "name": "EXELON CORP",
        "value": "1068746981.28",
        "weight": "0.00538684",
        "shared": true
      },
      {
        "name": "WW GRAINGER INC",
        "value": "1060170237.91",
        "weight": "0.00534361",
        "shared": true
      },
      {
        "name": "AMETEK INC NEW",
        "value": "1060006984.60",
        "weight": "0.00534279",
        "shared": true
      },
      {
        "name": "KEYSIGHT TECHNOLOGIES INC",
        "value": "1047655950.88",
        "weight": "0.00528054",
        "shared": true
      },
      {
        "name": "OCCIDENTAL PETROLEUM CORP",
        "value": "1038396190.00",
        "weight": "0.00523386",
        "shared": true
      }
    ],
    "b_top": [
      {
        "name": "Fidelity Securities Lending Cash Central Fund",
        "value": "650684994.78",
        "weight": "0.01370201",
        "shared": false
      },
      {
        "name": "WESTERN DIGITAL CORP",
        "value": "309763970.91",
        "weight": "0.00652295",
        "shared": true
      },
      {
        "name": "BANK OF NEW YORK MELLON CORP",
        "value": "304445700.80",
        "weight": "0.00641096",
        "shared": false
      },
      {
        "name": "HOWMET AEROSPACE INC",
        "value": "303593297.76",
        "weight": "0.00639301",
        "shared": true
      },
      {
        "name": "ROYAL CARIBBEAN CRUISES LTD",
        "value": "299280550.40",
        "weight": "0.00630220",
        "shared": false
      },
      {
        "name": "CORNING INC",
        "value": "293309605.75",
        "weight": "0.00617646",
        "shared": true
      },
      {
        "name": "CUMMINS INC",
        "value": "289844115.00",
        "weight": "0.00610349",
        "shared": true
      },
      {
        "name": "SANDISK CORPORATION",
        "value": "282755502.50",
        "weight": "0.00595421",
        "shared": false
      },
      {
        "name": "ROBINHOOD MARKETS INC",
        "value": "267882131.52",
        "weight": "0.00564101",
        "shared": true
      },
      {
        "name": "VERTIV HOLDINGS CO",
        "value": "257718734.10",
        "weight": "0.00542699",
        "shared": true
      },
      {
        "name": "QUANTA SVCS INC",
        "value": "254325264.57",
        "weight": "0.00535554",
        "shared": true
      },
      {
        "name": "HILTON WORLDWIDE HOLDINGS INC",
        "value": "247714344.36",
        "weight": "0.00521632",
        "shared": true
      },
      {
        "name": "CENCORA INC",
        "value": "239322781.38",
        "weight": "0.00503962",
        "shared": true
      },
      {
        "name": "WARNER BROS DISCOVERY INC",
        "value": "233385471.72",
        "weight": "0.00491459",
        "shared": true
      },
      {
        "name": "L3HARRIS TECHNOLOGIES INC",
        "value": "232968289.25",
        "weight": "0.00490580",
        "shared": true
      },
      {
        "name": "SIMON PROPERTY",
        "value": "225521967.30",
        "weight": "0.00474900",
        "shared": true
      },
      {
        "name": "ROSS STORES INC",
        "value": "218710056.95",
        "weight": "0.00460556",
        "shared": true
      },
      {
        "name": "KINDER MORGAN INC",
        "value": "215732757.25",
        "weight": "0.00454286",
        "shared": true
      },
      {
        "name": "PHILLIPS 66",
        "value": "210500592.40",
        "weight": "0.00443268",
        "shared": true
      },
      {
        "name": "DIGITAL REALTY TRUST INC",
        "value": "207746001.05",
        "weight": "0.00437468",
        "shared": true
      },
      {
        "name": "REALTY INCOME CORP REIT",
        "value": "203749219.08",
        "weight": "0.00429051",
        "shared": true
      },
      {
        "name": "CLOUDFLARE INC-A",
        "value": "202294632.20",
        "weight": "0.00425988",
        "shared": true
      },
      {
        "name": "BAKER HUGHES CO",
        "value": "202216305.12",
        "weight": "0.00425823",
        "shared": true
      },
      {
        "name": "VALERO ENERGY CORP",
        "value": "200664482.88",
        "weight": "0.00422556",
        "shared": true
      },
      {
        "name": "CARVANA CO CL A",
        "value": "197290766.82",
        "weight": "0.00415451",
        "shared": true
      },
      {
        "name": "FORD MOTOR CO",
        "value": "197147772.40",
        "weight": "0.00415150",
        "shared": true
      },
      {
        "name": "MARATHON PETROLEUM CORP",
        "value": "194958992.13",
        "weight": "0.00410541",
        "shared": true
      },
      {
        "name": "VISTRA CORP",
        "value": "194917765.50",
        "weight": "0.00410454",
        "shared": true
      },
      {
        "name": "IDEXX LABS INC",
        "value": "194352274.34",
        "weight": "0.00409264",
        "shared": true
      },
      {
        "name": "ALLSTATE CORPORATION",
        "value": "191054477.79",
        "weight": "0.00402319",
        "shared": true
      },
      {
        "name": "MONOLITHIC POWER SYS INC",
        "value": "189314729.05",
        "weight": "0.00398656",
        "shared": true
      },
      {
        "name": "AMETEK INC NEW",
        "value": "187747875.30",
        "weight": "0.00395356",
        "shared": true
      },
      {
        "name": "ELECTRONIC ARTS INC",
        "value": "186580682.40",
        "weight": "0.00392898",
        "shared": true
      },
      {
        "name": "CARDINAL HEALTH INC",
        "value": "186573212.96",
        "weight": "0.00392883",
        "shared": true
      },
      {
        "name": "CBRE GROUP INC - CL A",
        "value": "184279345.68",
        "weight": "0.00388052",
        "shared": true
      },
      {
        "name": "CORTEVA INC",
        "value": "181214342.40",
        "weight": "0.00381598",
        "shared": true
      },
      {
        "name": "FASTENAL CO",
        "value": "181104140.16",
        "weight": "0.00381366",
        "shared": true
      },
      {
        "name": "UNITED RENTALS INC",
        "value": "180608936.40",
        "weight": "0.00380323",
        "shared": true
      },
      {
        "name": "ONEOK INC",
        "value": "180049630.79",
        "weight": "0.00379145",
        "shared": true
      },
      {
        "name": "AMERIPRISE FINANCIAL INC",
        "value": "178288804.53",
        "weight": "0.00375437",
        "shared": true
      },
      {
        "name": "FERGUSON ENTERPRISES INC",
        "value": "175468283.64",
        "weight": "0.00369498",
        "shared": true
      },
      {
        "name": "ROCKWELL AUTOMATION INC",
        "value": "173603846.25",
        "weight": "0.00365572",
        "shared": true
      },
      {
        "name": "WW GRAINGER INC",
        "value": "171789295.62",
        "weight": "0.00361751",
        "shared": true
      },
      {
        "name": "ANGLOGOLD ASHANTI PLC",
        "value": "170198855.59",
        "weight": "0.00358402",
        "shared": false
      },
      {
        "name": "EXELON CORP",
        "value": "164680778.56",
        "weight": "0.00346782",
        "shared": true
      },
      {
        "name": "CHENIERE ENERGY INC",
        "value": "163984687.36",
        "weight": "0.00345316",
        "shared": true
      },
      {
        "name": "XCEL ENERGY INC",
        "value": "163784865.84",
        "weight": "0.00344895",
        "shared": true
      },
      {
        "name": "MSCI INC",
        "value": "161404919.14",
        "weight": "0.00339884",
        "shared": true
      },
      {
        "name": "NASDAQ INC",
        "value": "159629763.04",
        "weight": "0.00336145",
        "shared": true
      },
      {
        "name": "COINBASE GLOBAL INC",
        "value": "157896749.92",
        "weight": "0.00332496",
        "shared": true
      }
    ]
  },
  "error": null,
  "sources": [
    {
      "label": "N-PORT (fund A)",
      "accession_no": "0000036405-26-000314",
      "as_of": "2026-03-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/36405/000003640526000314/0000036405-26-000314-index.htm"
    },
    {
      "label": "N-PORT (fund B)",
      "accession_no": "0000035402-26-002034",
      "as_of": "2026-01-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/35315/000003540226002034/0000035402-26-002034-index.htm"
    }
  ]
}