ONTO·Onto Innovation Inc.

Realized volatility (21d)

55.0% 60th pct

Below its peak

-31.6%

vs 200-day average

+1.7%

Up days (1y)

51%

Onto Innovation Inc. is currently running 55.0% annualised volatility over the last 21 sessions. Measured against ONTO's own 7 years of daily returns rather than a market-wide average, that is the 60th percentile — close to its own typical level, against a typical reading of 50.9%. 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.

ONTO is trading -31.6% below its running peak. Across 6 full years on file, its median worst-drawdown-in-a-year was -39.1%, and the deepest was -60.4% in 2025. 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 +1.7% from its 200-day moving average. Against every other day in its history, that gap ranks at the 29th percentile — a narrower gap than it typically runs. Over the past year ONTO closed higher on 51% of sessions, and it is currently 3 sessions into a falling streak.

On October specifically: over 7 years of records, ONTO finished the month higher 2 of 7 times, with a median return of -1.8% and an average of -2.9%. Its strongest month historically has been November at +12.8% on average, its weakest February at -4.1%. 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: ONTO has opened more than 2% away from the prior close in 316 of 1,749 sessions (18.1% of the time), with the largest gaps running +9.4% and -10.6%. For anyone holding through an event, that rate is a better guide to overnight exposure than the intraday range.

All figures computed from 1,750 daily closes between 2019-10-28 and 2026-10-14, split-adjusted, recomputed daily. Percentiles are against ONTO's own 7-year history, not a peer group or index.