STM·STMicroelectronics N.V.

Realized volatility (21d)

51.0% 79th pct

Below its peak

-34.6%

vs 200-day average

+7.0%

Up days (1y)

54%

STMicroelectronics N.V. is currently running 51.0% annualised volatility over the last 21 sessions. Measured against STM's own 13 years of daily returns rather than a market-wide average, that is the 79th percentile — elevated for this stock, against a typical reading of 37.7%. 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.

STM is trading -34.6% below its running peak. Across 12 full years on file, its median worst-drawdown-in-a-year was -36.3%, and the deepest was -50.8% in 2018. 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 +7.0% from its 200-day moving average. Against every other day in its history, that gap ranks at the 54th percentile — close to the gap it normally carries. Over the past year STM closed higher on 54% of sessions, and it is currently 3 sessions into a falling streak.

On October specifically: over 13 years of records, STM finished the month higher 5 of 13 times, with a median return of -6.0% and an average of -1.7%. Its strongest month historically has been November at +6.6% on average, its weakest March at -2.5%. 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: STM has opened more than 2% away from the prior close in 501 of 3,266 sessions (15.3% of the time), with the largest gaps running +14.1% and -11.8%. For anyone holding through an event, that rate is a better guide to overnight exposure than the intraday range.

All figures computed from 3,267 daily closes between 2013-10-14 and 2026-10-09, split-adjusted, recomputed daily. Percentiles are against STM's own 13-year history, not a peer group or index.