Put-Call Ratio (Volume) (60-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 60-Day Put-Call Ratio (Volume) of 0.0000 for 2026-09-04.

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Figures for 2026-09-04

Volatility Metrics
Historical Volatility (Close-to-Close)	0.3827
Historical Volatility (Parkinson)	0.3814
Implied Volatility (Calls)	0.5817
Implied Volatility (Puts)	0.4863
Implied Volatility (Mean)	0.5340
Put-Call Implied Volatility Ratio	0.8359
Implied Volatility Skew	--
Option Statistics
Put-Call Ratio (Volume)	0.0000
Put-Call Ratio (Open Interest)	2.6924