CLS implied volatility
From the closing options book · October 20, 2026 · updated after every close
CLS's at-the-money implied volatility was 86.1% at the October 20, 2026 close. Over the past 259 sessions it ranged from 57.0% to 162.2%, putting today's level at an IV rank of 28 and IV percentile of 75.
CLS at-the-money IV, last 60 sessions
Options were pricing more movement than CLS actually delivered over the last 20 sessions (86.1% implied against 55.7% 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 CLS's own closing history.
These are the October 20, 2026 closing numbers. Members see CLS's map move live all session.
Common questions
86.1% at the money at the October 20, 2026 close.
28 over the past 259 sessions (IV percentile 75).
Its IV percentile is 75: 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.