MCK implied volatility
From the closing options book · October 20, 2026 · updated after every close
MCK's at-the-money implied volatility was 35.9% at the October 20, 2026 close. Over the past 231 sessions it ranged from 17.8% to 62.0%, putting today's level at an IV rank of 41 and IV percentile of 86.
MCK at-the-money IV, last 60 sessions
Options were pricing more movement than MCK actually delivered over the last 20 sessions (35.9% implied against 27.2% 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 MCK's own closing history.
These are the October 20, 2026 closing numbers. Members see MCK's map move live all session.
Common questions
35.9% at the money at the October 20, 2026 close.
41 over the past 231 sessions (IV percentile 86).
Its IV percentile is 86: 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.