Average NBBO spread and the midpoint saving, 10:00 to 11:00 a.m. ET, June 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 2026-08-09, from Midpoint Peg Orders Explained: Half-Cent Fills.

Rows × columns

6 × 3

Computed

2026-08-09

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 2026-08-09, and the query below is what returned them.

SELECT
    ticker                                                            AS symbol,
    round(avg(toFloat64(ask_price) - toFloat64(bid_price)) * 100, 2)  AS spread_cents,
    round(avg(toFloat64(ask_price) - toFloat64(bid_price)) * 50, 2)   AS half_spread_cents
FROM global_markets.cache_stocks_quotes
WHERE ticker IN ('SPY', 'KO', 'AAPL', 'MSFT', 'NVDA', 'BLK')
  AND sip_timestamp >= '2026-06-17 14:00:00'
  AND sip_timestamp <  '2026-06-17 15:00:00'
  AND bid_price > 0
  AND ask_price > bid_price
GROUP BY ticker
ORDER BY spread_cents ASC