session_share_by_ticker
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 2026-10-05, from us-stock-market-hours-vietnam-time.
| ticker | pct_premarket | pct_regular | pct_after_hours |
|---|---|---|---|
| SPY | 2.57 | 82.44 | 14.99 |
| NVDA | 4.35 | 89.96 | 5.69 |
| MSFT | 2.68 | 92.06 | 5.26 |
| AMZN | 2.95 | 92.66 | 4.39 |
| KO | 0.79 | 92.71 | 6.51 |
| AAPL | 1.89 | 93.62 | 4.49 |
- Rows × columns
- 6 × 4
- 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 |
|---|---|---|---|
ticker |
text | 6 distinct values (AAPL, AMZN, KO…) | |
pct_premarket |
number | 0.79 to 4.35 | percent |
pct_regular |
number | 82.44 to 93.62 | percent |
pct_after_hours |
number | 4.39 to 14.99 | percent |
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 tape AS
(
SELECT
ticker,
toHour(toTimeZone(window_start, 'America/New_York')) * 60
+ toMinute(toTimeZone(window_start, 'America/New_York')) AS et_minute,
toFloat64(volume) AS volume
FROM global_markets.delayed_stocks_minute_aggs
WHERE ticker IN ('AAPL', 'MSFT', 'NVDA', 'AMZN', 'SPY', 'KO')
AND window_start >= '2026-09-01 04:00:00'
AND window_start < '2026-10-01 04:00:00'
)
SELECT
ticker,
round(100 * sum(if(et_minute >= 240 AND et_minute < 570, volume, 0)) / sum(volume), 2) AS pct_premarket,
round(100 * sum(if(et_minute >= 570 AND et_minute < 960, volume, 0)) / sum(volume), 2) AS pct_regular,
round(100 * sum(if(et_minute >= 960 AND et_minute < 1200, volume, 0)) / sum(volume), 2) AS pct_after_hours
FROM tape
GROUP BY ticker
ORDER BY pct_regular
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