PSX implied volatility
From the closing options book · October 20, 2026 · updated after every close
PSX's at-the-money implied volatility was 47.6% at the October 20, 2026 close. Over the past 220 sessions it ranged from 23.0% to 55.2%, putting today's level at an IV rank of 76 and IV percentile of 98.
PSX at-the-money IV, last 60 sessions
Options were pricing more movement than PSX actually delivered over the last 20 sessions (47.6% implied against 28.1% 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 PSX's own closing history.
These are the October 20, 2026 closing numbers. Members see PSX's map move live all session.
Common questions
47.6% at the money at the October 20, 2026 close.
76 over the past 220 sessions (IV percentile 98).
Its IV percentile is 98: 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.