{
  "schemaVersion": "si-citable-statistic@1.1.0",
  "slug": "benchmark-mismatch-severity",
  "title": "Declared-benchmark mismatches by severity",
  "sentence": "The run classified 114 declared-benchmark mismatches: 96 changed index families and 18 stayed within adjacent broad-market or small-cap families.",
  "metrics": [
    {
      "label": "Style-family disagreement",
      "value": "96",
      "numericValue": 96,
      "unit": "funds",
      "observations": 96
    },
    {
      "label": "Mild adjacent-index mismatch",
      "value": "18",
      "numericValue": 18,
      "unit": "funds",
      "observations": 18
    },
    {
      "label": "Declared benchmark matched best fit",
      "value": "86",
      "numericValue": 86,
      "unit": "funds",
      "observations": 86
    }
  ],
  "vintageCutoff": "2026-06-30",
  "asOfBasis": "Registry vintage cutoff; input rows retain their own SEC source-event periods.",
  "portfolioEventPeriods": {
    "start": "2026-02-28",
    "end": "2026-06-30",
    "distribution": [
      {
        "date": "2026-02-28",
        "observations": 1
      },
      {
        "date": "2026-03-31",
        "observations": 102
      },
      {
        "date": "2026-04-30",
        "observations": 52
      },
      {
        "date": "2026-05-29",
        "observations": 11
      },
      {
        "date": "2026-05-31",
        "observations": 32
      },
      {
        "date": "2026-06-30",
        "observations": 2
      }
    ]
  },
  "expenseEventPeriods": null,
  "temporalCoverage": {
    "start": "2026-02-28",
    "end": "2026-06-30"
  },
  "publishedAt": "2026-08-09T16:51:31.122Z",
  "sourcePublishedAt": "2026-08-03T16:24:48.284Z",
  "runId": "57782d6c-572f-4e2f-9e55-117df0927e25",
  "methodologyVersion": "closet-index@3.0.0",
  "cohortVersion": "cohort-v2@2026-07-24",
  "verificationUrl": "/data/statistics/vintages/2026-06-30/57782d6c-572f-4e2f-9e55-117df0927e25/benchmark-mismatch-severity.json",
  "citation": "Sensible Investor (vintage cutoff 2026-06-30; portfolio events 2026-02-28 through 2026-06-30), “Declared-benchmark mismatches by severity,” closet-index@3.0.0; verification: https://sensible-investor.com/data/statistics/vintages/2026-06-30/57782d6c-572f-4e2f-9e55-117df0927e25/benchmark-mismatch-severity.json.",
  "method": "Compare the declared proxy family with the computed best-fit proxy family. S&P 500, Russell 1000, and total US market are adjacent broad-market indexes; S&P SmallCap 600 and Russell 2000 are adjacent small-cap indexes. Other family changes are style-family disagreements.",
  "traceSample": [
    {
      "seriesId": "S000011202",
      "declaredProxy": "IVV",
      "bestFitProxy": "IWD",
      "benchmarkMismatch": "mismatch"
    },
    {
      "seriesId": "S000004418",
      "declaredProxy": "IWD",
      "bestFitProxy": "IVV",
      "benchmarkMismatch": "mismatch"
    },
    {
      "seriesId": "S000003846",
      "declaredProxy": "IWB",
      "bestFitProxy": "IWD",
      "benchmarkMismatch": "mismatch"
    }
  ],
  "source": {
    "manifestSha256": "46602d4f6a5195e13e887f459cb8e0d46a0458edb373ff812d66fec1988850c6",
    "csvSha256": "040d3f500c099a57bb847bdc05cbee2f649a29f1fec4d19d85f1e5b8afc73ddc",
    "jsonSha256": "50b320640af5591373be7ad7c8f1ca28eb26213f581e2afb487ac2eb8d3599eb",
    "statisticsSource": {
      "url": "/data/statistics/sources/benchmark-mismatch-severity-2026-06-30-57782d6c-572f-4e2f-9e55-117df0927e25.json",
      "sha256": "d3fb9f395a9806d71006cc92eec9e5bda3e1943feac0c0a5d64ac8091d7bfa46",
      "retrievedAt": "2026-08-09T16:39:17.092Z",
      "publishedAt": "2026-08-09T16:51:31.122Z",
      "license": "https://creativecommons.org/licenses/by/4.0/"
    }
  }
}