Is high IV rank a sell signal?

No. High implied volatility can persist, and it does not predict direction or realised movement.

How is it different from IV percentile?

Rank uses the range endpoints; percentile uses the whole distribution of observations.

Options WhaleEarnings volatility research

Concept guide

IV Rank

IV rank places current implied volatility between the 52-week low and high on a 0–100% scale.

Concept

Formula

IV Rank = (current IV - 52-week low IV) / (52-week high IV - 52-week low IV)

What IV rank measures

IV rank answers how high current implied volatility is relative to its own recent range. A high rank suggests options are expensive versus the past year; a low rank suggests they are cheap.

Limitations

Rank is driven by the extremes, so a single spike can distort the scale. It also says nothing about whether the underlying will move more or less than implied.

FAQ

Is high IV rank a sell signal?: No. High implied volatility can persist, and it does not predict direction or realised movement.
How is it different from IV percentile?: Rank uses the range endpoints; percentile uses the whole distribution of observations.