What changed between consecutive top-of-book messages (AAPL, 10:00 to 10:30 a.m. ET, June 16, 2026)

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
    ordered AS
    (
        SELECT
            row_number() OVER (ORDER BY sip_timestamp, sequence_number) AS msg_index,
            bid_price,
            bid_size,
            lagInFrame(bid_price) OVER (ORDER BY sip_timestamp, sequence_number) AS prev_bid_price,
            lagInFrame(bid_size)  OVER (ORDER BY sip_timestamp, sequence_number) AS prev_bid_size
        FROM global_markets.cache_stocks_quotes
        WHERE ticker = 'AAPL'
          AND sip_timestamp >= '2026-06-16 14:00:00'
          AND sip_timestamp <  '2026-06-16 14:30:00'
          AND bid_price > 0
    ),
    classified AS
    (
        SELECT multiIf(
            bid_price != prev_bid_price, 'best bid price changed',
            bid_size  >  prev_bid_size,  'size joined at the best bid',
            bid_size  <  prev_bid_size,  'size left the best bid',
            'bid untouched, ask side updated') AS message_type
        FROM ordered
        WHERE msg_index > 1
    )
SELECT
    message_type,
    count()                                        AS message_count,
    round(100 * count() / sum(count()) OVER (), 1) AS share_pct
FROM classified
GROUP BY message_type
ORDER BY indexOf(['best bid price changed', 'size joined at the best bid', 'size left the best bid', 'bid untouched, ask side updated'], message_type)