CBOE implied volatility
From the closing options book · October 20, 2026 · updated after every close
CBOE's at-the-money implied volatility was 40.8% at the October 20, 2026 close. Over the past 253 sessions it ranged from 15.6% to 69.3%, putting today's level at an IV rank of 47 and IV percentile of 81.
CBOE at-the-money IV, last 60 sessions
Options were pricing less movement than CBOE actually delivered over the last 20 sessions (40.8% implied against 41.7% 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 CBOE's own closing history.
These are the October 20, 2026 closing numbers. Members see CBOE's map move live all session.
Common questions
40.8% at the money at the October 20, 2026 close.
47 over the past 253 sessions (IV percentile 81).
Its IV percentile is 81: high 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.