Put-Call Ratio (Volume) (90-Day)

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

Amphastar Pharmaceuticals, Inc. (AMPH) 90-Day Put-Call Ratio (Volume) data is not available for 2026-10-20.

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Figures for 2026-10-20

Volatility Metrics
Historical Volatility (Close-to-Close)	0.3295
Historical Volatility (Parkinson)	0.3642
Implied Volatility (Calls)	0.7513
Implied Volatility (Puts)	0.6106
Implied Volatility (Mean)	0.6810
Put-Call Implied Volatility Ratio	0.8127
Implied Volatility Skew	0.0432
Option Statistics
Put-Call Ratio (Volume)	--
Put-Call Ratio (Open Interest)	0.5027