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.

BlackRock (BLK) had 30-Day Put-Call Ratio (Open Interest) of 2.4211 for 2025-12-31.

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Figures for 2025-12-31

Volatility Metrics
Historical Volatility (Close-to-Close)	0.2037
Historical Volatility (Parkinson)	0.1700
Implied Volatility (Calls)	0.2548
Implied Volatility (Puts)	0.2449
Implied Volatility (Mean)	0.2498
Put-Call Implied Volatility Ratio	0.9610
Implied Volatility Skew	0.0680
Option Statistics
Put-Call Ratio (Volume)	1.1111
Put-Call Ratio (Open Interest)	2.4211