Put-Call Ratio (Open Interest) (30-Day)

Put-Call Ratio (Open Interest): The ratio of outstanding put contracts to outstanding call contracts at the close of the trading day, for options with the relevant expiration date.

Northwest Natural Gas Company (NWN) had 30-Day Put-Call Ratio (Open Interest) of 0.1929 for 2025-05-30.

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Figures for 2025-05-30

Volatility Metrics
Historical Volatility (Close-to-Close)	0.2319
Historical Volatility (Parkinson)	0.1976
Implied Volatility (Calls)	0.2158
Implied Volatility (Puts)	0.2701
Implied Volatility (Mean)	0.2429
Put-Call Implied Volatility Ratio	1.2511
Implied Volatility Skew	--
Option Statistics
Put-Call Ratio (Volume)	--
Put-Call Ratio (Open Interest)	0.1929