CTAS implied volatility
From the closing options book · October 20, 2026 · updated after every close
CTAS's at-the-money implied volatility was 23.2% at the October 20, 2026 close. Over the past 196 sessions it ranged from 16.7% to 99.1%, putting today's level at an IV rank of 8 and IV percentile of 18.
CTAS at-the-money IV, last 60 sessions
Options were pricing less movement than CTAS actually delivered over the last 20 sessions (23.2% implied against 24.4% 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 CTAS's own closing history.
These are the October 20, 2026 closing numbers. Members see CTAS's map move live all session.
Common questions
23.2% at the money at the October 20, 2026 close.
8 over the past 196 sessions (IV percentile 18).
Its IV percentile is 18: low 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.