Put-Call Ratio (Volume) (180-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 180-Day Put-Call Ratio (Volume) of 1.3333 for 2026-04-20.

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Figures for 2026-04-20

Volatility Metrics
Historical Volatility (Close-to-Close)	0.4937
Historical Volatility (Parkinson)	0.4640
Implied Volatility (Calls)	0.5422
Implied Volatility (Puts)	0.4840
Implied Volatility (Mean)	0.5131
Put-Call Implied Volatility Ratio	0.8927
Implied Volatility Skew	0.0391
Option Statistics
Put-Call Ratio (Volume)	1.3333
Put-Call Ratio (Open Interest)	0.4295