XBI implied volatility
From the closing options book · October 20, 2026 · updated after every close
XBI's at-the-money implied volatility was 33.5% at the October 20, 2026 close. Over the past 260 sessions it ranged from 24.5% to 44.1%, putting today's level at an IV rank of 46 and IV percentile of 80.
XBI at-the-money IV, last 60 sessions
Options were pricing less movement than XBI actually delivered over the last 20 sessions (33.5% implied against 34.6% 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 XBI's own closing history.
These are the October 20, 2026 closing numbers. Members see XBI's map move live all session.
Common questions
33.5% at the money at the October 20, 2026 close.
46 over the past 260 sessions (IV percentile 80).
Its IV percentile is 80: 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.