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.

PDF Solutions, Inc. (PDFS) had 120-Day Put-Call Ratio (Open Interest) of 0.4077 for 2026-10-16.

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Figures for 2026-10-16

Volatility Metrics
Historical Volatility (Close-to-Close)	0.8121
Historical Volatility (Parkinson)	0.6075
Implied Volatility (Calls)	0.7570
Implied Volatility (Puts)	0.7062
Implied Volatility (Mean)	0.7316
Put-Call Implied Volatility Ratio	0.9328
Implied Volatility Skew	0.0033
Option Statistics
Put-Call Ratio (Volume)	0.0000
Put-Call Ratio (Open Interest)	0.4077