Historical Volatility (Close-to-Close) (120-Day)
Historical Volatility (Close-to-Close): The past volatility of the security over the selected time frame, calculated using the closing price on each trading day.
ProShares Online Retail ETF (ONLN) had 120-Day Historical Volatility (Close-to-Close) of 0.2719 for 2026-04-21.
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