Put-Call Ratio (Volume) (90-Day)

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

Prothena Corporation plc (PRTA) had 90-Day Put-Call Ratio (Volume) of 0.0000 for 2026-01-16.

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Figures for 2026-01-16

Volatility Metrics
Historical Volatility (Close-to-Close)	0.4513
Historical Volatility (Parkinson)	0.5203
Implied Volatility (Calls)	0.4240
Implied Volatility (Puts)	0.5872
Implied Volatility (Mean)	0.5056
Put-Call Implied Volatility Ratio	1.3848
Implied Volatility Skew	0.0550
Option Statistics
Put-Call Ratio (Volume)	0.0000
Put-Call Ratio (Open Interest)	1.0773