STRASMORE/EXPLORE 2,170 QUERIES

Open, midday and close volume against an average session minute

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 2026-08-10, from Why Trading Volume Dies at Midday: U-Shape.

as of ranking 6×4read in context →
Open, midday and close volume against an average session minute — 6 rows by 4 columns, computed from US exchange, SIP and OPRA data.
tickeropen30_indexmidday_indexclose30_index
KO1.930.652.58
SPY1.570.72.38
MSFT2.310.681.98
AAPL2.310.71.88
QQQ1.870.751.71
NVDA2.340.721.38
Rows × columns
6 × 4
Computed
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

Column definitions for Open, midday and close volume against an average session minute, derived from the stored result.
ColumnTypeRangeNotes
ticker text 6 distinct values (AAPL, KO, MSFT…)
open30_index number 1.57 to 2.34
midday_index number 0.65 to 0.75
close30_index number 1.38 to 2.58

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.

the exact SQL behind every number 
WITH session_minutes AS
(
    SELECT
        ticker,
        toHour(toTimeZone(window_start, 'America/New_York')) * 60
          + toMinute(toTimeZone(window_start, 'America/New_York'))     AS et_minute,
        toFloat64(volume)                                              AS share_volume
    FROM global_markets.delayed_stocks_minute_aggs
    WHERE ticker IN ('SPY', 'QQQ', 'AAPL', 'MSFT', 'NVDA', 'KO')
      AND window_start >= '2025-01-02 00:00:00'
      AND window_start <  '2026-07-01 00:00:00'
)
SELECT
    ticker                                                             AS ticker,
    round((sumIf(share_volume, et_minute >= 570 AND et_minute < 600)
           / countIf(et_minute >= 570 AND et_minute < 600))
          / (sum(share_volume) / count()), 2)                          AS open30_index,
    round((sumIf(share_volume, et_minute >= 690 AND et_minute < 840)
           / countIf(et_minute >= 690 AND et_minute < 840))
          / (sum(share_volume) / count()), 2)                          AS midday_index,
    round((sumIf(share_volume, et_minute >= 930 AND et_minute < 960)
           / countIf(et_minute >= 930 AND et_minute < 960))
          / (sum(share_volume) / count()), 2)                          AS close30_index
FROM session_minutes
WHERE et_minute >= 570 AND et_minute < 960
GROUP BY ticker
HAVING countIf(et_minute >= 570 AND et_minute < 600) > 0
   AND countIf(et_minute >= 690 AND et_minute < 840) > 0
   AND countIf(et_minute >= 930 AND et_minute < 960) > 0
ORDER BY close30_index DESC

Run your own version of this

The same 22 years of US equities and 12 years of options data are queryable in SQL or plain English. A free account runs 100 queries a day and takes no card.

More from this analysisWhy Trading Volume Dies at Midday: U-Shape
SPY open, midday and close volume against an average minute, by year ranking 8×4 → Share of regular-session volume by half hour, SPY and AAPL series 13×3 → Average one-minute SPY range in basis points, by half hour series 13×3 → NVDA's off-exchange share of volume by Eastern-time hour, July 2, 2026 ranking 16×4 → SPY's expiring June 18, 2026 series: contracts traded by strike, and each strike's distance from the closing price ranking 12×4 → How far eight stocks move in a five minute window, trailing year ranking 8×4 → See all 2,170 queries →