Effective dates by weekday: US-listed splits, 2021 to mid-2026
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?.
| weekday | forward_splits | reverse_splits |
|---|---|---|
| Thursday | 300 | 789 |
| Monday | 267 | 1162 |
| Friday | 229 | 975 |
| Tuesday | 199 | 922 |
| Wednesday | 183 | 709 |
- Rows × columns
- 5 × 3
- Computed
- Completeness
- No missing values
- Source
- US exchange, SIP and OPRA market data
- Licence
- Strasmore terms · free, no signup
What each column holds
| Column | Type | Range | Notes |
|---|---|---|---|
weekday |
text | 5 distinct values (Friday, Monday, Thursday…) | |
forward_splits |
number | 183 to 300 | |
reverse_splits |
number | 709 to 1,162 |
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 , and the query below is what returned them.
Run it yourself
This is the exact query behind the result above. Change a ticker, a date or a column and run it against the warehouse — no account, no key. The no-signup tier is smaller than the one this page was computed on; a query that reaches past it comes back saying which plan runs it.
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(toDayOfWeek(execution_date) = 1, 'Monday',
toDayOfWeek(execution_date) = 2, 'Tuesday',
toDayOfWeek(execution_date) = 3, 'Wednesday',
toDayOfWeek(execution_date) = 4, 'Thursday',
'Friday') AS weekday,
countIf(ratio >= 1.25) AS forward_splits,
countIf(ratio < 1) AS reverse_splits
FROM s
WHERE toDayOfWeek(execution_date) <= 5
GROUP BY weekday
ORDER BY forward_splits DESC, weekday
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