{
  "schemaVersion": "si-citable-statistic@1.1.0",
  "slug": "index-premium-among-trackers",
  "title": "Index-premium distribution among tracker share classes",
  "sentence": "Among 42 share-class rows below 5% active share, the median filed-fee premium over the lowest-fee tracker for the same best-fit index is 10.0 basis points.",
  "metrics": [
    {
      "label": "25th percentile",
      "value": "2.0 basis points",
      "numericValue": 2,
      "unit": "basis points",
      "observations": 42
    },
    {
      "label": "Median",
      "value": "10.0 basis points",
      "numericValue": 10,
      "unit": "basis points",
      "observations": 42
    },
    {
      "label": "75th percentile",
      "value": "44.0 basis points",
      "numericValue": 44,
      "unit": "basis points",
      "observations": 42
    },
    {
      "label": "Maximum",
      "value": "111.0 basis points",
      "numericValue": 111,
      "unit": "basis points",
      "observations": 42
    }
  ],
  "vintageCutoff": "2026-06-30",
  "asOfBasis": "Registry vintage cutoff; input rows retain their own SEC source-event periods.",
  "portfolioEventPeriods": {
    "start": "2026-03-31",
    "end": "2026-03-31",
    "distribution": [
      {
        "date": "2026-03-31",
        "observations": 42
      }
    ]
  },
  "expenseEventPeriods": {
    "start": "2025-03-31",
    "end": "2025-12-31",
    "distribution": [
      {
        "date": "2025-03-31",
        "observations": 3
      },
      {
        "date": "2025-06-30",
        "observations": 4
      },
      {
        "date": "2025-12-31",
        "observations": 35
      }
    ]
  },
  "temporalCoverage": {
    "start": "2025-03-31",
    "end": "2026-03-31"
  },
  "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/index-premium-among-trackers.json",
  "citation": "Sensible Investor (vintage cutoff 2026-06-30; portfolio events 2026-03-31 through 2026-03-31; filed-expense events 2025-03-31 through 2025-12-31), “Index-premium distribution among tracker share classes,” closet-index@3.0.0; verification: https://sensible-investor.com/data/statistics/vintages/2026-06-30/57782d6c-572f-4e2f-9e55-117df0927e25/index-premium-among-trackers.json.",
  "method": "Select share-class rows below 5% active share. Within each best-fit index, subtract the lowest filed expense ratio in that tracker set, convert percentage points to basis points, then compute the distribution percentiles.",
  "traceSample": [
    {
      "seriesId": "S000002848",
      "classId": "C000007807",
      "netExpenseRatioPercent": 0.03,
      "premiumBasisPoints": 2
    },
    {
      "seriesId": "S000002848",
      "classId": "C000155407",
      "netExpenseRatioPercent": 0.02,
      "premiumBasisPoints": 1
    },
    {
      "seriesId": "S000002848",
      "classId": "C000170276",
      "netExpenseRatioPercent": 0.01,
      "premiumBasisPoints": 0
    }
  ],
  "source": {
    "manifestSha256": "46602d4f6a5195e13e887f459cb8e0d46a0458edb373ff812d66fec1988850c6",
    "csvSha256": "040d3f500c099a57bb847bdc05cbee2f649a29f1fec4d19d85f1e5b8afc73ddc",
    "jsonSha256": "50b320640af5591373be7ad7c8f1ca28eb26213f581e2afb487ac2eb8d3599eb",
    "statisticsSource": null
  }
}