Worst one-session and five-session declines since January 2015

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 Reg T Margin vs Portfolio Margin Explained.

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.

WITH moves AS
(
    SELECT
        ticker,
        toFloat64(close) AS c,
        lagInFrame(toFloat64(close), 1) OVER (PARTITION BY ticker ORDER BY date ROWS BETWEEN 1 PRECEDING AND CURRENT ROW) AS prev_close,
        lagInFrame(toFloat64(close), 5) OVER (PARTITION BY ticker ORDER BY date ROWS BETWEEN 5 PRECEDING AND CURRENT ROW) AS close_5d_ago
    FROM global_markets.stocks_daily_aggs
    WHERE ticker IN ('SPY', 'MSFT', 'AMD', 'BAC', 'KO', 'XOM')
      AND date >= '2015-01-01'
      AND date <  '2026-07-01'
)
SELECT
    ticker,
    round(min((c / prev_close   - 1) * 100), 1) AS worst_1d_pct,
    round(min((c / close_5d_ago - 1) * 100), 1) AS worst_5d_pct
FROM moves
WHERE prev_close > 0
  AND close_5d_ago > 0
GROUP BY ticker
ORDER BY worst_5d_pct