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) had 120-Day Put-Call Ratio (Volume) of 0.0000 for 2026-04-21.

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Figures for 2026-04-21

Volatility Metrics
Historical Volatility (Close-to-Close)	0.6339
Historical Volatility (Parkinson)	0.4222
Implied Volatility (Calls)	0.5660
Implied Volatility (Puts)	0.5353
Implied Volatility (Mean)	0.5507
Put-Call Implied Volatility Ratio	0.9458
Implied Volatility Skew	0.1092
Option Statistics
Put-Call Ratio (Volume)	0.0000
Put-Call Ratio (Open Interest)	0.0853