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.

Zai Lab Limited Unsponsored ADR (ZLAB) had 20-Day Put-Call Ratio (Volume) of 361.0000 for 2026-10-19.

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Figures for 2026-10-19

Volatility Metrics
Historical Volatility (Close-to-Close)	0.5333
Historical Volatility (Parkinson)	0.4411
Implied Volatility (Calls)	0.5868
Implied Volatility (Puts)	0.9046
Implied Volatility (Mean)	0.7457
Put-Call Implied Volatility Ratio	1.5415
Implied Volatility Skew	0.2431
Option Statistics
Put-Call Ratio (Volume)	361.0000
Put-Call Ratio (Open Interest)	42.7083