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.

Vanguard Mid-Cap ETF (VO) had 30-Day Put-Call Ratio (Open Interest) of 1.3083 for 2025-10-13.

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Figures for 2025-10-13

Volatility Metrics
Historical Volatility (Close-to-Close)	0.1172
Historical Volatility (Parkinson)	0.0999
Implied Volatility (Calls)	0.1682
Implied Volatility (Puts)	0.1751
Implied Volatility (Mean)	0.1716
Put-Call Implied Volatility Ratio	1.0410
Implied Volatility Skew	0.0493
Option Statistics
Put-Call Ratio (Volume)	0.8286
Put-Call Ratio (Open Interest)	1.3083