The overnight and New York halves of the day, year by year

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 2026-08-10, from International Fund NAV: Fair Value Pricing.

Rows × columns

6 × 3

Computed

2026-08-10

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 2026-08-10, and the query below is what returned them.

WITH daily AS
(
    SELECT
        date,
        toFloat64(open)  AS open_px,
        toFloat64(close) AS close_px,
        lagInFrame(toFloat64(close)) OVER (ORDER BY date
            ROWS BETWEEN 1 PRECEDING AND CURRENT ROW) AS prior_close_px
    FROM global_markets.stocks_daily_aggs
    WHERE ticker = 'SONY'
      AND date >= '2016-01-01'
      AND date <  '2026-08-01'
)
SELECT
    toString(toYear(date)) AS year,
    round(quantileDeterministic(0.5)(abs(open_px / prior_close_px - 1) * 100, toUInt32(date)), 3) AS overnight_gap_pct,
    round(quantileDeterministic(0.5)(abs(close_px / open_px - 1) * 100, toUInt32(date)), 3)       AS open_to_close_pct
FROM daily
WHERE prior_close_px > 0
  AND open_px > 0
GROUP BY year
ORDER BY year