Options NBBO tape: total updates vs the stock tape, plus the SPY root slice, July 27

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 2026-08-01, from Market Recap: July 27, 2026, The Day in Numbers.

Rows × columns

1 × 3

Computed

2026-08-01

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 2026-08-01, and the query below is what returned them.

WITH
    (SELECT count() FROM global_markets.cache_options_quotes WHERE sip_timestamp >= '2026-07-27 00:00:00' AND sip_timestamp < '2026-07-28 00:00:00') AS jul27_options_rows,
    (SELECT count() FROM global_markets.cache_stocks_quotes WHERE sip_timestamp >= '2026-07-27 00:00:00' AND sip_timestamp < '2026-07-28 00:00:00') AS jul27_stock_quote_rows
SELECT
    round(jul27_options_rows / 1e9, 2) AS jul27_options_bn,
    round(jul27_options_rows / jul27_stock_quote_rows, 1) AS options_to_stock_ratio,
    round((SELECT count() FROM global_markets.cache_options_quotes WHERE ticker >= 'O:SPY26' AND ticker < 'O:SPY27' AND sip_timestamp >= '2026-07-27 13:30:00' AND sip_timestamp < '2026-07-27 20:00:00') / 1e6, 0) AS jul27_spy_options_m