{
  "page": "compare",
  "query": {
    "a": "FSFWX",
    "b": "FSMAX"
  },
  "retrieved_at": "2026-07-07T16:39:46+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": "SMALLCAP World Fund Inc",
    "ticker": "FSFWX",
    "slug": "FSFWX",
    "series_id": "S000009599",
    "html_url": "https://fundwatcher.app/funds/FSFWX/"
  },
  "fund_b": {
    "name": "Fidelity Extended Market Index Fund",
    "ticker": "FSMAX",
    "slug": "FSMAX",
    "series_id": "S000006021",
    "html_url": "https://fundwatcher.app/funds/FSMAX/"
  },
  "overlap": {
    "coverage_a_by_b": "0.1899022928200230263091436451",
    "coverage_b_by_a": "0.1899022928200230263091436447",
    "shared_count": 308,
    "as_of": {
      "a": "2026-03-31",
      "b": "2026-02-28"
    },
    "a_top": [
      {
        "name": "CAPITAL GROUP CENTRAL CASH FUND",
        "value": "3217877612.94",
        "weight": "0.03940535",
        "shared": false
      },
      {
        "name": "COMFORT SYSTEMS USA INC",
        "value": "1188241208.25",
        "weight": "0.01455091",
        "shared": false
      },
      {
        "name": "LUMENTUM HOLDINGS INC",
        "value": "1032364278.64",
        "weight": "0.01264208",
        "shared": true
      },
      {
        "name": "DIPLOMA PLC COMMON STOCK",
        "value": "827407185.87",
        "weight": "0.01013223",
        "shared": false
      },
      {
        "name": "TOPBUILD CORP",
        "value": "711230738.40",
        "weight": "0.00870956",
        "shared": true
      },
      {
        "name": "KOKUSAI ELECTRIC",
        "value": "631210044.37",
        "weight": "0.00772965",
        "shared": false
      },
      {
        "name": "ATI INC",
        "value": "623907613.84",
        "weight": "0.00764022",
        "shared": true
      },
      {
        "name": "MKS INSTRUMENTS INC",
        "value": "588084479.43",
        "weight": "0.00720154",
        "shared": true
      },
      {
        "name": "BOMBARDIER INC-B",
        "value": "565617329.26",
        "weight": "0.00692641",
        "shared": false
      },
      {
        "name": "LUNDIN MINING CORP",
        "value": "506377119.37",
        "weight": "0.00620097",
        "shared": false
      },
      {
        "name": "MODINE MFG CO",
        "value": "477460889.75",
        "weight": "0.00584687",
        "shared": true
      },
      {
        "name": "CAVA GROUP INC",
        "value": "469879173.20",
        "weight": "0.00575403",
        "shared": true
      },
      {
        "name": "CELANESE CORP",
        "value": "447985514.92",
        "weight": "0.00548592",
        "shared": true
      },
      {
        "name": "CRANE CO",
        "value": "446538969.00",
        "weight": "0.00546821",
        "shared": true
      },
      {
        "name": "DOLLARAMA INC",
        "value": "441451986.84",
        "weight": "0.00540591",
        "shared": false
      },
      {
        "name": "FABRINET",
        "value": "417295792.56",
        "weight": "0.00511010",
        "shared": true
      },
      {
        "name": "ARCOSA INC",
        "value": "416451116.28",
        "weight": "0.00509976",
        "shared": true
      },
      {
        "name": "INTL CONTAINER TERM SVCS INC COMMON STOCK",
        "value": "391285465.15",
        "weight": "0.00479159",
        "shared": false
      },
      {
        "name": "VIAVI SOLUTIONS INC",
        "value": "385060216.32",
        "weight": "0.00471535",
        "shared": true
      },
      {
        "name": "NIPPON TV HDS",
        "value": "380898318.29",
        "weight": "0.00466439",
        "shared": false
      },
      {
        "name": "RESONAC HOLDINGS",
        "value": "361426874.77",
        "weight": "0.00442595",
        "shared": false
      },
      {
        "name": "FTAI AVIATION LTD",
        "value": "359776130.00",
        "weight": "0.00440573",
        "shared": true
      },
      {
        "name": "NATL BANK GREECE",
        "value": "357027033.97",
        "weight": "0.00437207",
        "shared": false
      },
      {
        "name": "EMEMORY TECH",
        "value": "354411082.15",
        "weight": "0.00434003",
        "shared": false
      },
      {
        "name": "LOTTOMATICA GROU",
        "value": "343622278.56",
        "weight": "0.00420792",
        "shared": false
      },
      {
        "name": "JENTECH",
        "value": "341082071.77",
        "weight": "0.00417681",
        "shared": false
      },
      {
        "name": "KNIFE RIVER HOLDING CO W/I",
        "value": "338181154.35",
        "weight": "0.00414128",
        "shared": true
      },
      {
        "name": "GLOBAL UNICHIP",
        "value": "336698449.81",
        "weight": "0.00412313",
        "shared": false
      },
      {
        "name": "IONIS PHARMACEUTICALS INC",
        "value": "334762108.05",
        "weight": "0.00409942",
        "shared": true
      },
      {
        "name": "SEMTECH CORP",
        "value": "333522292.95",
        "weight": "0.00408423",
        "shared": true
      },
      {
        "name": "SPX TECHNOLOGIES INC",
        "value": "331033260.22",
        "weight": "0.00405375",
        "shared": true
      },
      {
        "name": "IMI PLC ORD",
        "value": "324163593.66",
        "weight": "0.00396963",
        "shared": false
      },
      {
        "name": "RAIADROGASIL",
        "value": "320950976.16",
        "weight": "0.00393029",
        "shared": false
      },
      {
        "name": "CAVCO INDUSTRIES INC",
        "value": "319648834.44",
        "weight": "0.00391434",
        "shared": true
      },
      {
        "name": "ROYAL GOLD INC",
        "value": "314685792.15",
        "weight": "0.00385357",
        "shared": true
      },
      {
        "name": "ENPRO INDUSTRIES INC",
        "value": "314325877.95",
        "weight": "0.00384916",
        "shared": true
      },
      {
        "name": "BABCOCK INTL GRP",
        "value": "308579031.71",
        "weight": "0.00377878",
        "shared": false
      },
      {
        "name": "MARUWA CO LTD",
        "value": "306688111.27",
        "weight": "0.00375563",
        "shared": false
      },
      {
        "name": "ESSENT GROUP LTD",
        "value": "303660200.88",
        "weight": "0.00371855",
        "shared": true
      },
      {
        "name": "WEATHERFORD INTERNATIONAL PLC",
        "value": "302210433.62",
        "weight": "0.00370080",
        "shared": true
      },
      {
        "name": "SAIA INC",
        "value": "296939794.24",
        "weight": "0.00363625",
        "shared": true
      },
      {
        "name": "VSE CORP",
        "value": "294075956.80",
        "weight": "0.00360118",
        "shared": true
      },
      {
        "name": "APL APOLLO TUBES",
        "value": "293644204.74",
        "weight": "0.00359590",
        "shared": false
      },
      {
        "name": "360 ONE WAM LTD",
        "value": "287770530.17",
        "weight": "0.00352397",
        "shared": false
      },
      {
        "name": "WAYFAIR INC- A",
        "value": "287617630.74",
        "weight": "0.00352210",
        "shared": true
      },
      {
        "name": "GAMES WORKSHOP GROUP CO PLC",
        "value": "285830825.24",
        "weight": "0.00350021",
        "shared": false
      },
      {
        "name": "ASMPT LTD",
        "value": "284104727.21",
        "weight": "0.00347908",
        "shared": false
      },
      {
        "name": "FED SIGNAL CORP",
        "value": "283893237.32",
        "weight": "0.00347649",
        "shared": true
      },
      {
        "name": "RENAISSANCERE HLDGS LTD",
        "value": "283022406.00",
        "weight": "0.00346582",
        "shared": true
      },
      {
        "name": "PATRICK INDUSTRIES INC",
        "value": "280494289.81",
        "weight": "0.00343487",
        "shared": true
      }
    ],
    "b_top": [
      {
        "name": "Fidelity Securities Lending Cash Central Fund",
        "value": "2265848955.41",
        "weight": "0.05245502",
        "shared": false
      },
      {
        "name": "VERTIV HOLDINGS CO",
        "value": "510291564.23",
        "weight": "0.01181339",
        "shared": false
      },
      {
        "name": "MARVELL TECHNOLOGY INC",
        "value": "368750783.94",
        "weight": "0.00853668",
        "shared": false
      },
      {
        "name": "SNOWFLAKE INC CL A",
        "value": "299488386.89",
        "weight": "0.00693324",
        "shared": false
      },
      {
        "name": "CLOUDFLARE INC-A",
        "value": "284650904.99",
        "weight": "0.00658975",
        "shared": false
      },
      {
        "name": "FERGUSON ENTERPRISES INC",
        "value": "267516030.84",
        "weight": "0.00619307",
        "shared": false
      },
      {
        "name": "CHENIERE ENERGY INC",
        "value": "265342166.87",
        "weight": "0.00614274",
        "shared": false
      },
      {
        "name": "LUMENTUM HOLDINGS INC",
        "value": "260235967.53",
        "weight": "0.00602453",
        "shared": true
      },
      {
        "name": "ROBLOX CORP - A",
        "value": "235197782.38",
        "weight": "0.00544489",
        "shared": false
      },
      {
        "name": "ALNYLAM PHARMACEUTICALS INC",
        "value": "230301737.96",
        "weight": "0.00533155",
        "shared": true
      },
      {
        "name": "COHERENT CORP",
        "value": "213083595.27",
        "weight": "0.00493294",
        "shared": false
      },
      {
        "name": "STRATEGY INC CL A",
        "value": "182114555.00",
        "weight": "0.00421600",
        "shared": false
      },
      {
        "name": "BLOOM ENERGY CORP CL A",
        "value": "177548640.15",
        "weight": "0.00411030",
        "shared": true
      },
      {
        "name": "AMRIZE LTD",
        "value": "175030938.02",
        "weight": "0.00405201",
        "shared": false
      },
      {
        "name": "ROCKET LAB CORP",
        "value": "170374480.20",
        "weight": "0.00394422",
        "shared": false
      },
      {
        "name": "INSMED INC",
        "value": "166853576.84",
        "weight": "0.00386271",
        "shared": true
      },
      {
        "name": "FTAI AVIATION LTD",
        "value": "164161085.00",
        "weight": "0.00380037",
        "shared": true
      },
      {
        "name": "NATERA INC",
        "value": "150346347.20",
        "weight": "0.00348056",
        "shared": true
      },
      {
        "name": "VEEVA SYSTEMS-A",
        "value": "145491331.59",
        "weight": "0.00336816",
        "shared": false
      },
      {
        "name": "MONGODB INC CL A",
        "value": "139901613.93",
        "weight": "0.00323876",
        "shared": true
      },
      {
        "name": "TECHNIPFMC PLC",
        "value": "139684004.30",
        "weight": "0.00323372",
        "shared": false
      },
      {
        "name": "MARKEL GROUP INC",
        "value": "136264902.50",
        "weight": "0.00315457",
        "shared": false
      },
      {
        "name": "COUPANG INC A",
        "value": "134922464.64",
        "weight": "0.00312349",
        "shared": false
      },
      {
        "name": "CURTISS WRIGHT CORPORATION",
        "value": "134889860.97",
        "weight": "0.00312274",
        "shared": false
      },
      {
        "name": "CASEY'S GENERAL",
        "value": "133295835.75",
        "weight": "0.00308583",
        "shared": false
      },
      {
        "name": "XPO LOGISTICS INC",
        "value": "129169858.87",
        "weight": "0.00299032",
        "shared": true
      },
      {
        "name": "ROYAL GOLD INC",
        "value": "127130746.14",
        "weight": "0.00294311",
        "shared": true
      },
      {
        "name": "LPL FINL HLDGS INC",
        "value": "125715337.98",
        "weight": "0.00291034",
        "shared": false
      },
      {
        "name": "FLEX LTD",
        "value": "121993422.78",
        "weight": "0.00282418",
        "shared": false
      },
      {
        "name": "WOODWARD INC",
        "value": "121212131.04",
        "weight": "0.00280609",
        "shared": false
      },
      {
        "name": "SOFI TECHNOLOGIES INC A",
        "value": "117609028.80",
        "weight": "0.00272268",
        "shared": false
      },
      {
        "name": "ATI INC",
        "value": "116221043.19",
        "weight": "0.00269055",
        "shared": true
      },
      {
        "name": "UNITED THERAPEUTICS CORP DEL",
        "value": "113473241.00",
        "weight": "0.00262694",
        "shared": false
      },
      {
        "name": "US FOODS HOLDING CORP",
        "value": "112653829.48",
        "weight": "0.00260797",
        "shared": false
      },
      {
        "name": "TENET HEALTHCARE CORP",
        "value": "110170390.07",
        "weight": "0.00255047",
        "shared": false
      },
      {
        "name": "ILLUMINA INC",
        "value": "107474550.30",
        "weight": "0.00248806",
        "shared": false
      },
      {
        "name": "LIBERTY MEDIA CORP LIBERTY FORMULA ONE CL C",
        "value": "106898169.42",
        "weight": "0.00247472",
        "shared": false
      },
      {
        "name": "ENTEGRIS INC",
        "value": "105151260.30",
        "weight": "0.00243428",
        "shared": false
      },
      {
        "name": "PURE STORAGE INC CL A",
        "value": "105017745.82",
        "weight": "0.00243119",
        "shared": false
      },
      {
        "name": "CARPENTER TECHNOLOGY CORP",
        "value": "103811879.16",
        "weight": "0.00240327",
        "shared": false
      },
      {
        "name": "EXACT SCIENCES CORP",
        "value": "102492275.94",
        "weight": "0.00237272",
        "shared": false
      },
      {
        "name": "FABRINET",
        "value": "102414751.00",
        "weight": "0.00237093",
        "shared": true
      },
      {
        "name": "AST SPACEMOBILE INC",
        "value": "100036371.55",
        "weight": "0.00231587",
        "shared": false
      },
      {
        "name": "FIRST CITIZENS BANCSHARES INC CL A",
        "value": "99992643.85",
        "weight": "0.00231486",
        "shared": false
      },
      {
        "name": "BURLINGTON STORES INC",
        "value": "99913803.30",
        "weight": "0.00231303",
        "shared": false
      },
      {
        "name": "NVENT ELECTRIC PLC",
        "value": "99850981.56",
        "weight": "0.00231158",
        "shared": false
      },
      {
        "name": "BWX TECHNOLOGIES INC",
        "value": "98482951.62",
        "weight": "0.00227991",
        "shared": true
      },
      {
        "name": "TEMPUR SEALY INTERNATIONAL INC",
        "value": "98223619.48",
        "weight": "0.00227390",
        "shared": false
      },
      {
        "name": "RB GLOBAL INC",
        "value": "97919589.60",
        "weight": "0.00226687",
        "shared": false
      },
      {
        "name": "HEICO CORP CL A",
        "value": "97854189.29",
        "weight": "0.00226535",
        "shared": false
      }
    ]
  },
  "error": null,
  "sources": [
    {
      "label": "N-PORT (fund A)",
      "accession_no": "0001193125-26-243462",
      "as_of": "2026-03-31",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/858744/000119312526243462/0001193125-26-243462-index.htm"
    },
    {
      "label": "N-PORT (fund B)",
      "accession_no": "0000035402-26-002587",
      "as_of": "2026-02-28",
      "edgar_url": "https://www.sec.gov/Archives/edgar/data/819118/000003540226002587/0000035402-26-002587-index.htm"
    }
  ]
}