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One at-the-money call settled two ways: the ten widest splits since January 2024

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 2026-08-03, from AM vs PM Settled Index Options Explained.

as of table 10×5read in context →
One at-the-money call settled two ways: the ten widest splits since January 2024 — 10 rows by 5 columns, computed from US exchange, SIP and OPRA data.
expiry_labelgap_abs_pctam_settlement_usdpm_settlement_usdsettlement_spread_usd
Dec 20, 20240.7404.874.87
Jan 19, 20240.251.656.424.77
Feb 20, 20260.3204.364.36
Nov 21, 20250.392.056.064.01
Dec 19, 20250.020.594.594
Apr 17, 20260.654.148.043.9
Oct 17, 20250.1703.323.32
May 16, 20250.141.254.293.04
Jan 16, 20260.211.6601.66
Jun 20, 20250.151.3801.38
Rows × columns
10 × 5
Computed
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

Column definitions for One at-the-money call settled two ways: the ten widest splits since January 2024, derived from the stored result.
ColumnTypeRangeNotes
expiry_label text 10 distinct values (Apr 17, 2026, Dec 19, 2025, Dec 20, 2024…)
gap_abs_pct number 0.02 to 0.74 percent
am_settlement_usd number 0 to 4.14 US dollars
pm_settlement_usd number 0 to 8.04 US dollars
settlement_spread_usd number 1.38 to 4.87 US dollars

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.

the exact SQL behind every number
WITH sessions AS (
    SELECT toDate(toTimeZone(window_start, 'America/New_York')) AS session_date,
           toFloat64(argMin(open, window_start)) AS first_print,
           toFloat64(argMax(close, window_start)) AS last_print
    FROM global_markets.delayed_stocks_minute_aggs
    WHERE ticker = 'SPY'
      AND toDate(toTimeZone(window_start, 'America/New_York')) BETWEEN toDate('2023-12-01') AND toDate('2026-07-31')
      AND (toHour(toTimeZone(window_start, 'America/New_York')) * 60
           + toMinute(toTimeZone(window_start, 'America/New_York'))) BETWEEN 570 AND 959
    GROUP BY session_date
),
sequenced AS (
    SELECT session_date,
           first_print,
           last_print,
           any(last_print) OVER (ORDER BY session_date ASC
                                 ROWS BETWEEN 1 PRECEDING AND 1 PRECEDING) AS prior_close
    FROM sessions
),
expirations AS (
    SELECT session_date,
           first_print,
           last_print,
           round(prior_close, 0) AS strike,
           abs(first_print / prior_close - 1) * 100 AS gap_abs_raw
    FROM sequenced
    WHERE prior_close > 0
      AND session_date >= toDate('2024-01-01')
      AND toDayOfWeek(session_date) = 5
      AND toDayOfMonth(session_date) BETWEEN 15 AND 21
)
SELECT formatDateTime(session_date, '%b %e, %Y') AS expiry_label,
       round(gap_abs_raw, 2) AS gap_abs_pct,
       round(greatest(first_print - strike, 0), 2) AS am_settlement_usd,
       round(greatest(last_print - strike, 0), 2) AS pm_settlement_usd,
       round(abs(greatest(last_print - strike, 0) - greatest(first_print - strike, 0)), 2) AS settlement_spread_usd
FROM expirations
ORDER BY settlement_spread_usd DESC
LIMIT 10

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