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.

Amtech Systems, Inc. (ASYS) had 20-Day Put-Call Ratio (Volume) of 0.0056 for 2026-09-21.

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Figures for 2026-09-21

Volatility Metrics
Historical Volatility (Close-to-Close)	0.5716
Historical Volatility (Parkinson)	0.4304
Implied Volatility (Calls)	0.7768
Implied Volatility (Puts)	0.7280
Implied Volatility (Mean)	0.7524
Put-Call Implied Volatility Ratio	0.9371
Implied Volatility Skew	-0.1102
Option Statistics
Put-Call Ratio (Volume)	0.0056
Put-Call Ratio (Open Interest)	2.8500