Best and worst 21-session moves since 2021
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 2026-10-06, from Is a Covered Put Actually Covered?.
| ticker | best_21d_gain_pct | worst_21d_drop_pct |
|---|---|---|
| F | 42.5 | 30.2 |
| XOM | 32.1 | 18.1 |
| MSFT | 31.4 | 18.5 |
| AAPL | 22.4 | 24.2 |
| KO | 17 | 12.8 |
| SPY | 15.4 | 13.2 |
- Rows × columns
- 6 × 3
- Computed
- Completeness
- No missing values
- Source
- US exchange, SIP and OPRA market data
- Licence
- Strasmore terms · free, no signup
What each column holds
| Column | Type | Range | Notes |
|---|---|---|---|
ticker |
text | 6 distinct values (AAPL, F, KO…) | |
best_21d_gain_pct |
number | 15.4 to 42.5 | percent |
worst_21d_drop_pct |
number | 12.8 to 30.2 | percent |
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.
Run it yourself
This is the exact query behind the result above. Change a ticker, a date or a column and run it against the warehouse — no account, no key. The no-signup tier is smaller than the one this page was computed on; a query that reaches past it comes back saying which plan runs it.
WITH ranked AS
(
SELECT
ticker,
date,
toFloat64(close) AS c,
row_number() OVER (PARTITION BY ticker ORDER BY date) AS n
FROM global_markets.stocks_daily_aggs
WHERE ticker IN ('AAPL', 'MSFT', 'KO', 'SPY', 'XOM', 'F')
AND date >= '2021-01-01'
AND date < '2026-10-01'
)
SELECT
a.ticker AS ticker,
round((max(b.c / a.c) - 1) * 100, 1) AS best_21d_gain_pct,
round(abs(min(b.c / a.c) - 1) * 100, 1) AS worst_21d_drop_pct
FROM ranked AS a
INNER JOIN ranked AS b ON b.ticker = a.ticker AND b.n = a.n + 21
GROUP BY a.ticker
ORDER BY best_21d_gain_pct DESC
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