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.

Spero Therapeutics, Inc. (SPRO) had 90-Day Put-Call Ratio (Volume) of 0.0000 for 2026-03-05.

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Figures for 2026-03-05

Volatility Metrics
Historical Volatility (Close-to-Close)	0.3804
Historical Volatility (Parkinson)	0.4135
Implied Volatility (Calls)	0.6713
Implied Volatility (Puts)	1.0140
Implied Volatility (Mean)	0.8426
Put-Call Implied Volatility Ratio	1.5106
Implied Volatility Skew	0.0194
Option Statistics
Put-Call Ratio (Volume)	0.0000
Put-Call Ratio (Open Interest)	0.2402