Historical Volatility (Parkinson) (20-Day)

Historical Volatility (Parkinson): The past volatility of the security over the selected time frame, calculated using the high and low prices on each trading day.

Alcon (ALC) had 20-Day Historical Volatility (Parkinson) of 0.1956 for 2026-03-02.

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Over 300 data fields encompassing historical volatility, implied volatility, and put-call ratios for multiple time frames
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Figures for 2026-03-02

Volatility Metrics
Historical Volatility (Close-to-Close)	0.2447
Historical Volatility (Parkinson)	0.1956
Implied Volatility (Calls)	0.2812
Implied Volatility (Puts)	0.2834
Implied Volatility (Mean)	0.2823
Put-Call Implied Volatility Ratio	1.0078
Implied Volatility Skew	--
Option Statistics
Put-Call Ratio (Volume)	0.8829
Put-Call Ratio (Open Interest)	2.4831