Put-Call Ratio (Volume) (20-Day)

Put-Call Ratio (Volume): The ratio of puts traded to calls traded, for options with the relevant expiration date.

PDF Solutions, Inc. (PDFS) had 20-Day Put-Call Ratio (Volume) of 0.0345 for 2026-06-04.

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Figures for 2026-06-04

Volatility Metrics
Historical Volatility (Close-to-Close)	0.5619
Historical Volatility (Parkinson)	0.6348
Implied Volatility (Calls)	0.9206
Implied Volatility (Puts)	0.7531
Implied Volatility (Mean)	0.8369
Put-Call Implied Volatility Ratio	0.8181
Implied Volatility Skew	0.1389
Option Statistics
Put-Call Ratio (Volume)	0.0345
Put-Call Ratio (Open Interest)	0.4192