Put-Call Ratio (Volume) (180-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 180-Day Put-Call Ratio (Volume) of 0.2500 for 2026-06-05.

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Figures for 2026-06-05

Volatility Metrics
Historical Volatility (Close-to-Close)	0.7857
Historical Volatility (Parkinson)	0.4136
Implied Volatility (Calls)	0.8181
Implied Volatility (Puts)	0.5000
Implied Volatility (Mean)	0.6591
Put-Call Implied Volatility Ratio	0.6112
Implied Volatility Skew	0.0926
Option Statistics
Put-Call Ratio (Volume)	0.2500
Put-Call Ratio (Open Interest)	0.0651