{"slug":"when-does-a-stock-split-take-effect","qid":"ratio_bands","label":"US-listed splits by ratio band, 2021 to mid-2026: the 25% line in the data","post_title":"When Does a Stock Split Take Effect?","post_url":"/blog/when-does-a-stock-split-take-effect#q-ratio_bands","columns":["ratio_band","splits","companies"],"rows":[{"ratio_band":"reverse split","splits":4559,"companies":3523},{"ratio_band":"under 25%","splits":1101,"companies":383},{"ratio_band":"25% to 2-for-1","splits":117,"companies":100},{"ratio_band":"2-for-1 to 5-for-1","splits":727,"companies":682},{"ratio_band":"5-for-1 or larger","splits":334,"companies":332}],"shape":"ranking","sql":"WITH s AS (\n    SELECT ticker,\n           execution_date,\n           toFloat64(max(split_to)) / toFloat64(max(split_from)) AS ratio\n    FROM global_markets.stocks_splits\n    WHERE execution_date >= toDate('2021-01-01')\n      AND execution_date <= toDate('2026-07-31')\n      AND split_to > 0\n      AND split_from > 0\n    GROUP BY ticker, execution_date\n)\nSELECT multiIf(ratio < 1, 'reverse split',\n               ratio < 1.25, 'under 25%',\n               ratio < 2, '25% to 2-for-1',\n               ratio < 5, '2-for-1 to 5-for-1',\n               '5-for-1 or larger') AS ratio_band,\n       count() AS splits,\n       uniqExact(ticker) AS companies\nFROM s\nGROUP BY ratio_band\nORDER BY min(ratio)","computed_at":"2026-08-05T04:35:35.631122+00:00","elapsed":0.00253194}