WLK·Westlake Corporation

Realized volatility (21d)

28.6% 38th pct

Below its peak

-61.8%

vs 200-day average

-29.7%

Up days (1y)

44%

Westlake Corporation is currently running 28.6% annualised volatility over the last 21 sessions. Measured against WLK's own 13 years of daily returns rather than a market-wide average, that is the 38th percentile — on the quiet side for this stock, against a typical reading of 31.8%. The distinction matters because a number that looks calm for one stock is turbulent for another, and the absolute figure on its own tells you neither.

WLK is trading -61.8% below its running peak. Across 12 full years on file, its median worst-drawdown-in-a-year was -33.6%, and the deepest was -58.1% in 2020. The current drawdown is already deeper than this stock's typical annual low point, which puts it in the part of its range where past recoveries began — and where past declines also continued.

Price sits -29.7% from its 200-day moving average. Against every other day in its history, that gap ranks at the 4th percentile — a narrower gap than it typically runs. Over the past year WLK closed higher on 44% of sessions, and it is currently 1 session into a rising streak.

On October specifically: over 13 years of records, WLK finished the month higher 6 of 13 times, with a median return of -1.0% and an average of -2.2%. Its strongest month historically has been February at +3.4% on average, its weakest May at -3.0%. Seasonality is a weak signal on its own — a decade is a small sample and regimes change — but it is a real distribution rather than a rule of thumb.

Overnight risk is measurable too: WLK has opened more than 2% away from the prior close in 218 of 3,267 sessions (6.7% of the time), with the largest gaps running +10.1% and -14.9%. For anyone holding through an event, that rate is a better guide to overnight exposure than the intraday range.

All figures computed from 3,268 daily closes between 2013-10-15 and 2026-10-13, split-adjusted, recomputed daily. Percentiles are against WLK's own 13-year history, not a peer group or index.