HCA implied volatility
From the closing options book · October 20, 2026 · updated after every close
HCA's at-the-money implied volatility was 38.8% at the October 20, 2026 close. Over the past 230 sessions it ranged from 21.0% to 74.4%, putting today's level at an IV rank of 33 and IV percentile of 88.
HCA at-the-money IV, last 60 sessions
Options were pricing more movement than HCA actually delivered over the last 20 sessions (38.8% implied against 24.8% 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 HCA's own closing history.
These are the October 20, 2026 closing numbers. Members see HCA's map move live all session.
Common questions
38.8% at the money at the October 20, 2026 close.
33 over the past 230 sessions (IV percentile 88).
Its IV percentile is 88: 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.