GLW·Corning Incorporated

Realized volatility (21d)

60.8% 93rd pct

Below its peak

-42.7%

vs 200-day average

-4.0%

Up days (1y)

52%

Corning Incorporated is currently running 60.8% annualised volatility over the last 21 sessions. Measured against GLW's own 13 years of daily returns rather than a market-wide average, that is the 93rd percentile — an extreme by its own standards, against a typical reading of 25.5%. 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.

GLW is trading -42.7% below its running peak. Across 12 full years on file, its median worst-drawdown-in-a-year was -24.0%, and the deepest was -41.3% in 2020. The current drawdown is already deeper than this stock's typical annual low point, which puts it in the part of its range where past recoveries began — and where past declines also continued.

Price sits -4.0% from its 200-day moving average. Against every other day in its history, that gap ranks at the 28th percentile — a narrower gap than it typically runs. Over the past year GLW closed higher on 52% of sessions, and it is currently 1 session into a falling streak.

On October specifically: over 14 years of records, GLW finished the month higher 8 of 14 times, with a median return of +5.2% and an average of +2.2%. Its strongest month historically has been June at +5.5% on average, its weakest March at -1.9%. 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: GLW has opened more than 2% away from the prior close in 140 of 3,268 sessions (4.3% of the time), with the largest gaps running +6.0% and -10.2%. 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, GLW moved an average of 1.6% in the session after earnings, closing higher 0 of those 3 times, with a median move of -1.7% and a largest of -2.6%.

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