Put-Call Ratio (Open Interest) (20-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.

CME Group Inc. (CME) had 20-Day Put-Call Ratio (Open Interest) of 1.2751 for 2025-09-19.

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Figures for 2025-09-19

Volatility Metrics
Historical Volatility (Close-to-Close)	0.1517
Historical Volatility (Parkinson)	0.1562
Implied Volatility (Calls)	0.2165
Implied Volatility (Puts)	0.2139
Implied Volatility (Mean)	0.2152
Put-Call Implied Volatility Ratio	0.9882
Implied Volatility Skew	0.0551
Option Statistics
Put-Call Ratio (Volume)	0.7427
Put-Call Ratio (Open Interest)	1.2751