Put-Call Ratio (Volume) (20-Day)

Put-Call Ratio (Volume): The ratio of puts traded to calls traded, for options with the relevant expiration date.

Krystal Biotech, Inc. (KRYS) had 20-Day Put-Call Ratio (Volume) of 0.0000 for 2026-04-21.

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Figures for 2026-04-21

Volatility Metrics
Historical Volatility (Close-to-Close)	0.2736
Historical Volatility (Parkinson)	0.2800
Implied Volatility (Calls)	0.5746
Implied Volatility (Puts)	0.5758
Implied Volatility (Mean)	0.5752
Put-Call Implied Volatility Ratio	1.0022
Implied Volatility Skew	0.0628
Option Statistics
Put-Call Ratio (Volume)	0.0000
Put-Call Ratio (Open Interest)	0.3874