Is the price file already adjusted? The pre and post close quotient
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 2026-09-20, from How split-adjusted price history works.
| split_event | split_n | close_ratio |
|---|---|---|
| SHOP Jun 2022 | 10 | 1.06 |
| GOOGL Jul 2022 | 20 | 1.025 |
| NVDA Jul 2021 | 4 | 1.009 |
| TSLA Aug 2022 | 3 | 1.003 |
| CMG Jun 2024 | 50 | 0.997 |
| NVDA Jun 2024 | 10 | 0.993 |
| WMT Feb 2024 | 3 | 0.982 |
| AMZN Jun 2022 | 20 | 0.98 |
| AAPL Aug 2020 | 4 | 0.967 |
| TSLA Aug 2020 | 5 | 0.888 |
- Rows × columns
- 10 × 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 |
|---|---|---|---|
split_event |
text | 10 distinct values | |
split_n |
number | 3 to 50 | count |
close_ratio |
number | 0.888 to 1.06 | US dollars |
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
sp AS (
SELECT
ticker,
execution_date,
toFloat64(any(split_to)) / toFloat64(any(split_from)) AS n
FROM global_markets.stocks_splits
WHERE execution_date >= '2020-01-01'
AND execution_date < today() - 20
AND split_to >= split_from * 3
AND ticker IN ('AAPL', 'AMZN', 'CMG', 'GOOGL', 'NVDA', 'SHOP', 'TSLA', 'WMT')
GROUP BY ticker, execution_date
),
px AS (
SELECT
ticker,
date,
toFloat64(any(close)) AS c
FROM global_markets.stocks_daily_aggs
WHERE ticker IN ('AAPL', 'AMZN', 'CMG', 'GOOGL', 'NVDA', 'SHOP', 'TSLA', 'WMT')
AND date >= '2019-12-01'
AND date < today()
GROUP BY ticker, date
)
SELECT
concat(sp.ticker, ' ', formatDateTime(sp.execution_date, '%b %Y')) AS split_event,
round(any(sp.n), 2) AS split_n,
round(argMaxIf(px.c, px.date, px.date < sp.execution_date)
/ argMinIf(px.c, px.date, px.date >= sp.execution_date), 3) AS close_ratio
FROM sp
INNER JOIN px ON px.ticker = sp.ticker
WHERE px.date >= sp.execution_date - 15
AND px.date <= sp.execution_date + 15
GROUP BY sp.ticker, sp.execution_date
HAVING countIf(px.date < sp.execution_date) > 0
AND countIf(px.date >= sp.execution_date) > 0
ORDER BY close_ratio DESC, split_event
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