{"schemaVersion":"si-citable-statistic@1.1.0","slug":"benchmark-mismatch-severity","title":"Declared-benchmark mismatches by severity","sentence":"The run classified 109 declared-benchmark mismatches: 89 changed index families and 20 stayed within adjacent broad-market or small-cap families.","metrics":[{"label":"Style-family disagreement","value":"89","numericValue":89,"unit":"funds","observations":89},{"label":"Mild adjacent-index mismatch","value":"20","numericValue":20,"unit":"funds","observations":20},{"label":"Declared benchmark matched best fit","value":"91","numericValue":91,"unit":"funds","observations":91}],"vintageCutoff":"2026-06-30","asOfBasis":"Registry vintage cutoff; input rows retain their own SEC source-event periods.","portfolioEventPeriods":{"start":"2026-04-30","end":"2026-06-30","distribution":[{"date":"2026-04-30","observations":47},{"date":"2026-05-29","observations":11},{"date":"2026-05-31","observations":32},{"date":"2026-06-30","observations":110}]},"expenseEventPeriods":null,"temporalCoverage":{"start":"2026-04-30","end":"2026-06-30"},"publishedAt":"2026-09-01T10:06:09.683Z","sourcePublishedAt":"2026-09-01T10:06:09.683Z","runId":"fffcd45a-98bb-4e8e-b699-e94626fa3ab3","methodologyVersion":"closet-index@3.0.0","cohortVersion":"cohort-v2@2026-07-24","verificationUrl":"/data/statistics/vintages/2026-06-30/fffcd45a-98bb-4e8e-b699-e94626fa3ab3/benchmark-mismatch-severity.json","citation":"Sensible Investor (vintage cutoff 2026-06-30; portfolio events 2026-04-30 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/fffcd45a-98bb-4e8e-b699-e94626fa3ab3/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":"S000004418","declaredProxy":"IWD","bestFitProxy":"IVV","benchmarkMismatch":"mismatch"},{"seriesId":"S000003846","declaredProxy":"IWB","bestFitProxy":"IWD","benchmarkMismatch":"mismatch"},{"seriesId":"S000048334","declaredProxy":"VTI","bestFitProxy":"IWF","benchmarkMismatch":"mismatch"}],"source":{"manifestSha256":"c89d0bedf5d1c2df410d590431fa23ba27268fdf2bb76ef26d931ed0de1d4e6c","csvSha256":"a18be8b1fdb91d7a8b83f45253e1a9c514fa0223855f80247fe7ecbf783ab800","jsonSha256":"1b9bd205e5e8846aab2bc0d6798f186c182ceb1474736dd34c7281c713a46f74","statisticsSource":{"url":"/data/statistics/sources/vintages/2026-06-30/fffcd45a-98bb-4e8e-b699-e94626fa3ab3/benchmark-mismatch-severity.json","sha256":"9c41a36f54ac4898ce6d3d02e9a38cf1b9dd40752bcd0c1c0e21d7c76d73d307","retrievedAt":"2026-09-01T09:31:36.244Z","publishedAt":"2026-09-01T10:06:09.683Z","license":"https://creativecommons.org/licenses/by/4.0/"}}}