Historical Volatility (Parkinson) (30-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.
Vanguard Mid-Cap Index Fund ETF Shares (VO) had 30-Day Historical Volatility (Parkinson) of 0.1333 for 2026-04-17.
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