GLW implied volatility
From the closing options book · October 20, 2026 · updated after every close
GLW's at-the-money implied volatility was 69.1% at the October 20, 2026 close. Over the past 221 sessions it ranged from 33.5% to 117.9%, putting today's level at an IV rank of 42 and IV percentile of 57.
GLW at-the-money IV, last 60 sessions
Options were pricing more movement than GLW actually delivered over the last 20 sessions (69.1% implied against 59.1% realized).
IV rank places today's IV between the period's low (0) and high (100); IV percentile is the share of sessions with lower IV. Both use GLW's own closing history.
These are the October 20, 2026 closing numbers. Members see GLW's map move live all session.
Common questions
69.1% at the money at the October 20, 2026 close.
42 over the past 221 sessions (IV percentile 57).
Its IV percentile is 57: middling against its own past year.
Compare: implied volatility on other tickers
Measured from the closing options book and rebuilt after every close. Nothing on this page is live. Levels are where dealer hedging is concentrated, not targets or forecasts. Not investment advice.