ATI·ATI Inc.

Realized volatility (21d)

39.2% 40th pct

Below its peak

-20.6%

vs 200-day average

+14.2%

Up days (1y)

54%

ATI Inc. is currently running 39.2% annualised volatility over the last 21 sessions. Measured against ATI's own 13 years of daily returns rather than a market-wide average, that is the 40th percentile — close to its own typical level, against a typical reading of 43.0%. 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.

ATI is trading -20.6% below its running peak. Across 12 full years on file, its median worst-drawdown-in-a-year was -35.4%, and the deepest was -74.5% 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 +14.2% from its 200-day moving average. Against every other day in its history, that gap ranks at the 61st percentile — a somewhat wider gap than its own norm. Over the past year ATI closed higher on 54% of sessions, and it is currently 6 sessions into a falling streak.

On September specifically: over 14 years of records, ATI finished the month higher 7 of 14 times, with a median return of +1.2% and an average of -1.1%. Its strongest month historically has been February at +13.4% on average, its weakest March at -5.1%. 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: ATI has opened more than 2% away from the prior close in 376 of 3,268 sessions (11.5% of the time), with the largest gaps running +10.7% and -16.1%. For anyone holding through an event, that rate is a better guide to overnight exposure than the intraday range.

All figures computed from 3,269 daily closes between 2013-09-16 and 2026-09-15, split-adjusted, recomputed daily. Percentiles are against ATI's own 13-year history, not a peer group or index.