Put-Call Ratio (Volume) (10-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 10-Day Put-Call Ratio (Volume) of 0.7895 for 2026-10-19.

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Figures for 2026-10-19

Volatility Metrics
Historical Volatility (Close-to-Close)	0.1506
Historical Volatility (Parkinson)	0.2354
Implied Volatility (Calls)	0.7612
Implied Volatility (Puts)	0.6821
Implied Volatility (Mean)	0.7216
Put-Call Implied Volatility Ratio	0.8962
Implied Volatility Skew	-0.0016
Option Statistics
Put-Call Ratio (Volume)	0.7895
Put-Call Ratio (Open Interest)	4.7732