STRASMORE/EXPLORE 3,127 QUERIES

SPY volume by half hour, premarket through after-hours (same session, ET clock)

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 2026-10-04, from Stock Market Hours: Open 9:30, Close 4:00 ET.

as of table 32×2read in context →
SPY volume by half hour, premarket through after-hours (same session, ET clock) — 32 rows by 2 columns, computed from US exchange, SIP and OPRA data.
et_half_hourshares_m
04:000.22
04:300.06
05:000.04
05:300.02
06:000.12
06:300.11
07:000.11
07:300.09
08:000.17
08:300.12
09:000.34
09:304.56
10:003.95
10:303.07
11:002.73
11:303.18
12:002.29
12:302.22
13:002.49
13:303.68
14:002.3
14:302
15:001.51
15:306.94
16:004.07
16:300.83
17:000.36
17:300.04
18:000.03
18:300.01
19:000.01
19:300.01
Rows × columns
32 × 2
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 SPY volume by half hour, premarket through after-hours (same session, ET clock), derived from the stored result.
ColumnTypeRangeNotes
et_half_hour text 32 distinct values (04:00, 04:30, 05:00…)
shares_m number 0.01 to 6.94 count

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
(
    SELECT max(d)
    FROM
    (
        SELECT
            toDate(toTimeZone(window_start, 'America/New_York')) AS d,
            countIf((toHour(toTimeZone(window_start, 'America/New_York')) * 60
                     + toMinute(toTimeZone(window_start, 'America/New_York'))) >= 570
                AND (toHour(toTimeZone(window_start, 'America/New_York')) * 60
                     + toMinute(toTimeZone(window_start, 'America/New_York'))) < 960) AS rth_bars
        FROM global_markets.delayed_stocks_minute_aggs
        WHERE ticker = 'SPY'
          AND window_start >= today() - 21
          AND window_start < today() - 2
        GROUP BY d
        HAVING rth_bars = 390
    )
) AS session_day
SELECT
    formatDateTime(toStartOfInterval(if(has(conditions, 8),
                                         toTimeZone(sip_timestamp, 'America/New_York') - INTERVAL 10 MINUTE,
                                         toTimeZone(sip_timestamp, 'America/New_York')),
                                      INTERVAL 30 MINUTE), '%H:%i') AS et_half_hour,
    round(sum(toFloat64(size)) / 1e6, 2) AS shares_m
FROM global_markets.stocks_trades
WHERE ticker = 'SPY'
  AND sip_timestamp >= toDateTime(session_day, 'America/New_York')
  AND sip_timestamp <  toDateTime(session_day + 1, 'America/New_York')
  AND NOT hasAny(conditions, [15, 16, 38])
GROUP BY et_half_hour
ORDER BY et_half_hour
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More from this analysisStock Market Hours: Open 9:30, Close 4:00 ET
SPY volume by half hour on the early-close session, premarket through the shortened after-hours (ET clock) table 26×2 → Upcoming US stock market holidays and early closes, from the exchange calendar series 12×6 → Single-name vs. ETF options at the 4:00 p.m. bell: AAPL and SPY options trades around the close (same session) series 2×6 → Trading sessions over the trailing year, counted from the SPY tape scalar 1×7 → A full trading day on the SPY tape, split by session window (recent full-length session) scalar 1×15 → The most recent early-close session on the SPY tape, split by session window scalar 1×13 → See all 3,127 queries →