US-listed splits by ratio band, 2021 to mid-2026: the 25% line in the data

Answered against 22 years of US equities and 12 years of US options data and published with the query that produced it. This result is stored as of 2026-08-05, from When Does a Stock Split Take Effect?.

Rows × columns

5 × 3

Computed

2026-08-05

Completeness

No missing values

Source

US exchange, SIP and OPRA market data

Licence

Strasmore terms · free, no signup

Formats

JSON · CSV · the SQL below

What each column holds

Computed from Strasmore's warehouse of US exchange, SIP and OPRA market data. Equity prices are delayed; options greeks and implied volatility are end-of-day. This result is stored, not recomputed on load — it is exactly the numbers that were returned on 2026-08-05, and the query below is what returned them.

WITH s AS (
    SELECT ticker,
           execution_date,
           toFloat64(max(split_to)) / toFloat64(max(split_from)) AS ratio
    FROM global_markets.stocks_splits
    WHERE execution_date >= toDate('2021-01-01')
      AND execution_date <= toDate('2026-07-31')
      AND split_to > 0
      AND split_from > 0
    GROUP BY ticker, execution_date
)
SELECT multiIf(ratio < 1, 'reverse split',
               ratio < 1.25, 'under 25%',
               ratio < 2, '25% to 2-for-1',
               ratio < 5, '2-for-1 to 5-for-1',
               '5-for-1 or larger') AS ratio_band,
       count() AS splits,
       uniqExact(ticker) AS companies
FROM s
GROUP BY ratio_band
ORDER BY min(ratio)