Put-Call Ratio (Volume) (120-Day)

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

Amphastar Pharmaceuticals, Inc. (AMPH) 120-Day Put-Call Ratio (Volume) data is not available for 2026-09-04.

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Figures for 2026-09-04

Volatility Metrics
Historical Volatility (Close-to-Close)	0.5960
Historical Volatility (Parkinson)	0.4033
Implied Volatility (Calls)	0.5227
Implied Volatility (Puts)	0.5336
Implied Volatility (Mean)	0.5281
Put-Call Implied Volatility Ratio	1.0208
Implied Volatility Skew	-0.0349
Option Statistics
Put-Call Ratio (Volume)	--
Put-Call Ratio (Open Interest)	0.5615