Put-Call Ratio (Open Interest) (120-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.

NL Industries, Inc. (NL) had 120-Day Put-Call Ratio (Open Interest) of 0.0654 for 2026-01-20.

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Figures for 2026-01-20

Volatility Metrics
Historical Volatility (Close-to-Close)	0.4766
Historical Volatility (Parkinson)	0.5017
Implied Volatility (Calls)	0.5435
Implied Volatility (Puts)	1.0524
Implied Volatility (Mean)	0.7979
Put-Call Implied Volatility Ratio	1.9362
Implied Volatility Skew	0.0747
Option Statistics
Put-Call Ratio (Volume)	--
Put-Call Ratio (Open Interest)	0.0654