AAPL average quoted spread by half-hour (ET), one extended session
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 2026-09-26, from How Do Market Makers Make Money? The Spread.
| et_time | avg_spread_cents |
|---|---|
| 04:00 | 30.8 |
| 04:30 | 31.3 |
| 05:00 | 23.6 |
| 05:30 | 29.9 |
| 06:00 | 28.8 |
| 06:30 | 22.6 |
| 07:00 | 18.7 |
| 07:30 | 14.1 |
| 08:00 | 20.1 |
| 08:30 | 15.7 |
| 09:00 | 26.9 |
| 09:30 | 8.7 |
| 10:00 | 4.7 |
| 10:30 | 3.7 |
| 11:00 | 3.9 |
| 11:30 | 3.2 |
| 12:00 | 4.3 |
| 12:30 | 4 |
| 13:00 | 4.5 |
| 13:30 | 3.5 |
| 14:00 | 3.3 |
| 14:30 | 3.2 |
| 15:00 | 2.9 |
| 15:30 | 2.3 |
| 16:00 | 20.8 |
| 16:30 | 23.5 |
| 17:00 | 17.1 |
| 17:30 | 11.6 |
| 18:00 | 15.9 |
| 18:30 | 12.4 |
| 19:00 | 8.8 |
| 19:30 | 27.3 |
- Rows × columns
- 32 × 2
- Computed
- Completeness
- No missing values
- Source
- US exchange, SIP and OPRA market data
- Licence
- Strasmore terms · free, no signup
What each column holds
| Column | Type | Range | Notes |
|---|---|---|---|
et_time |
text | 32 distinct values (04:00, 04:30, 05:00…) | |
avg_spread_cents |
number | 2.3 to 31.3 |
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.
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WITH ( SELECT max(toDate(sip_timestamp)) FROM global_markets.cache_stocks_quotes WHERE ticker = 'AAPL' AND sip_timestamp >= now() - INTERVAL 7 DAY ) AS last_session SELECT formatDateTime(toStartOfInterval(toTimeZone(sip_timestamp, 'America/New_York'), INTERVAL 30 MINUTE), '%H:%i') AS et_time, round(avg(ask_price - bid_price) * 100, 1) AS avg_spread_cents FROM global_markets.cache_stocks_quotes WHERE ticker = 'AAPL' AND sip_timestamp >= now() - INTERVAL 7 DAY AND toDate(sip_timestamp) = last_session AND bid_price > 0 AND ask_price > bid_price GROUP BY et_time ORDER BY et_time
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