CAH implied volatility
From the closing options book · October 20, 2026 · updated after every close
CAH's at-the-money implied volatility was 33.1% at the October 20, 2026 close. Over the past 222 sessions it ranged from 18.5% to 78.2%, putting today's level at an IV rank of 24 and IV percentile of 79.
CAH at-the-money IV, last 60 sessions
Options were pricing more movement than CAH actually delivered over the last 20 sessions (33.1% implied against 25.3% 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 CAH's own closing history.
These are the October 20, 2026 closing numbers. Members see CAH's map move live all session.
Common questions
33.1% at the money at the October 20, 2026 close.
24 over the past 222 sessions (IV percentile 79).
Its IV percentile is 79: 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.