Average quoted spread by ET half hour: AAPL and KO, Friday July 17, 2026

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 2026-08-02, from Learn Quant Trading From an Open Source Book.

Rows × columns

16 × 3

Period covered

09:00 to 16:30

Computed

2026-08-02

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 2026-08-02, and the query below is what returned them.

WITH quotes AS (
    SELECT ticker,
           toStartOfInterval(toTimeZone(sip_timestamp, 'America/New_York'), INTERVAL 30 MINUTE) AS bucket,
           toFloat64(ask_price - bid_price) / toFloat64((ask_price + bid_price) / 2) * 10000 AS spread_bps
    FROM global_markets.cache_stocks_quotes
    WHERE ticker IN ('AAPL', 'KO')
      AND sip_timestamp >= toDateTime('2026-07-17 13:00:00')
      AND sip_timestamp < toDateTime('2026-07-17 21:00:00')
      AND bid_price > 0
      AND ask_price > bid_price
)
SELECT formatDateTime(bucket, '%H:%i') AS et_time,
       round(avgIf(spread_bps, ticker = 'AAPL'), 2) AS aapl_spread_bps,
       round(avgIf(spread_bps, ticker = 'KO'), 2) AS ko_spread_bps
FROM quotes
WHERE spread_bps > 0 AND spread_bps < 500
GROUP BY et_time
HAVING countIf(ticker = 'AAPL') > 0 AND countIf(ticker = 'KO') > 0
ORDER BY et_time