Share of SPY's regular-session volume by five-minute ET bucket

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 2026-08-22, from MOC and MOO Order Cutoff Times: NYSE & Nasdaq.

Rows × columns

79 × 2

Period covered

09:30 to 16:00

Computed

2026-08-22

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

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 2026-08-22, and the query below is what returned them.

SELECT
    formatDateTime(toDateTime(bucket_minute * 60, 'UTC'), '%H:%i')        AS et_time,
    round(100 * bucket_volume / sum(bucket_volume) OVER (), 3)           AS pct_of_session_volume
FROM
(
    SELECT
        intDiv(et_minute_of_day, 5) * 5 AS bucket_minute,
        sum(volume)                     AS bucket_volume
    FROM
    (
        SELECT
            toHour(toTimeZone(window_start, 'America/New_York')) * 60
                + toMinute(toTimeZone(window_start, 'America/New_York')) AS et_minute_of_day,
            volume
        FROM global_markets.delayed_stocks_minute_aggs
        WHERE ticker = 'SPY'
          AND window_start >= today() - 75
          AND window_start <  today() - 2
    )
    WHERE et_minute_of_day >= 570 AND et_minute_of_day <= 960
    GROUP BY bucket_minute
)
ORDER BY et_time