WMS·Advanced Drainage Systems Inc.

Realized volatility (21d)

23.4% 13th pct

Below its peak

-29.3%

vs 200-day average

-12.6%

Up days (1y)

46%

Advanced Drainage Systems Inc. is currently running 23.4% annualised volatility over the last 21 sessions. Measured against WMS's own 12 years of daily returns rather than a market-wide average, that is the 13th percentile — unusually subdued by its own history, against a typical reading of 34.1%. 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.

WMS is trading -29.3% below its running peak. Across 11 full years on file, its median worst-drawdown-in-a-year was -29.8%, and the deepest was -53.7% in 2020. The current pullback is therefore shallower than what this stock gives back in a typical year, which is context worth having before treating it as a dislocation.

Price sits -12.6% from its 200-day moving average. Against every other day in its history, that gap ranks at the 16th percentile — a narrower gap than it typically runs. Over the past year WMS closed higher on 46% of sessions, and it is currently 2 sessions into a rising streak.

On October specifically: over 12 years of records, WMS finished the month higher 4 of 12 times, with a median return of -2.8% and an average of -2.0%. Its strongest month historically has been April at +5.1% on average, its weakest March at -3.6%. 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: WMS has opened more than 2% away from the prior close in 216 of 3,072 sessions (7.0% of the time), with the largest gaps running +7.9% and -19.6%. For anyone holding through an event, that rate is a better guide to overnight exposure than the intraday range.

All figures computed from 3,073 daily closes between 2014-07-25 and 2026-10-13, split-adjusted, recomputed daily. Percentiles are against WMS's own 12-year history, not a peer group or index.