TER·Teradyne, Inc.

Realized volatility (21d)

55.0% 82nd pct

Below its peak

-22.2%

vs 200-day average

+10.0%

Up days (1y)

54%

Teradyne, Inc. is currently running 55.0% annualised volatility over the last 21 sessions. Measured against TER's own 13 years of daily returns rather than a market-wide average, that is the 82nd percentile — elevated for this stock, against a typical reading of 35.1%. 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.

TER is trading -22.2% below its running peak. Across 12 full years on file, its median worst-drawdown-in-a-year was -28.3%, and the deepest was -57.2% in 2022. 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 +10.0% from its 200-day moving average. Against every other day in its history, that gap ranks at the 56th percentile — a somewhat wider gap than its own norm. Over the past year TER closed higher on 54% of sessions, and it is currently 3 sessions into a falling streak.

On October specifically: over 14 years of records, TER finished the month higher 9 of 14 times, with a median return of +5.4% and an average of +4.0%. Its strongest month historically has been May at +5.9% on average, its weakest March at -1.8%. 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: TER has opened more than 2% away from the prior close in 260 of 3,268 sessions (8.0% of the time), with the largest gaps running +10.3% and -8.1%. For anyone holding through an event, that rate is a better guide to overnight exposure than the intraday range.

Across the last 3 dated reports on file, TER moved an average of 8.4% in the session after earnings, closing higher 0 of those 3 times, with a median move of -10.1% and a largest of -10.2%.

All figures computed from 3,269 daily closes between 2013-10-15 and 2026-10-14, split-adjusted, recomputed daily. Percentiles are against TER's own 13-year history, not a peer group or index.