Put-Call Ratio (Volume) (120-Day)

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

Energy Recovery, Inc. (ERII) had 120-Day Put-Call Ratio (Volume) of 0.0000 for 2026-10-16.

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Figures for 2026-10-16

Volatility Metrics
Historical Volatility (Close-to-Close)	0.3671
Historical Volatility (Parkinson)	0.3540
Implied Volatility (Calls)	0.7524
Implied Volatility (Puts)	0.5160
Implied Volatility (Mean)	0.6342
Put-Call Implied Volatility Ratio	0.6858
Implied Volatility Skew	0.1652
Option Statistics
Put-Call Ratio (Volume)	0.0000
Put-Call Ratio (Open Interest)	16.1568