Historical Volatility (Parkinson) (120-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.
Natural Grocers by Vitamin Cottage, Inc. (NGVC) had 120-Day Historical Volatility (Parkinson) of 0.5386 for 2025-08-01.
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