Historical Volatility (Parkinson) (180-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.
State Street SPDR S&P Biotech ETF (XBI) had 180-Day Historical Volatility (Parkinson) of 0.2538 for 2026-07-21.
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