CSCO implied volatility
From the closing options book · October 20, 2026 · updated after every close
CSCO's at-the-money implied volatility was 38.3% at the October 20, 2026 close. Over the past 239 sessions it ranged from 16.0% to 79.8%, putting today's level at an IV rank of 35 and IV percentile of 75.
CSCO at-the-money IV, last 60 sessions
Options were pricing more movement than CSCO actually delivered over the last 20 sessions (38.3% implied against 30.0% 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 CSCO's own closing history.
These are the October 20, 2026 closing numbers. Members see CSCO's map move live all session.
Common questions
38.3% at the money at the October 20, 2026 close.
35 over the past 239 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.