Historical Volatility (Parkinson) (10-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.

ProShares UltraShort Health Care (RXD) had 10-Day Historical Volatility (Parkinson) of 0.2406 for 2026-03-09.

For much more extensive volatility insights, check out our new product VolVue:

Over 300 data fields encompassing historical volatility, implied volatility, and put-call ratios for multiple time frames
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Figures for 2026-03-09

Volatility Metrics
Historical Volatility (Close-to-Close)	0.3477
Historical Volatility (Parkinson)	0.2406
Implied Volatility (Calls)	1.1371
Implied Volatility (Puts)	1.0512
Implied Volatility (Mean)	1.0942
Put-Call Implied Volatility Ratio	0.9245
Implied Volatility Skew	--
Option Statistics
Put-Call Ratio (Volume)	--
Put-Call Ratio (Open Interest)	--