GM implied volatility
From the closing options book · October 20, 2026 · updated after every close
GM's at-the-money implied volatility was 34.6% at the October 20, 2026 close. Over the past 223 sessions it ranged from 23.2% to 54.9%, putting today's level at an IV rank of 36 and IV percentile of 45.
GM at-the-money IV, last 60 sessions
Options were pricing less movement than GM actually delivered over the last 20 sessions (34.6% implied against 40.6% 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 GM's own closing history.
These are the October 20, 2026 closing numbers. Members see GM's map move live all session.
Common questions
34.6% at the money at the October 20, 2026 close.
36 over the past 223 sessions (IV percentile 45).
Its IV percentile is 45: middling 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.