Historical Volatility (Close-to-Close) (30-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 Ultra QQQ Top 30 (QQXL) had 30-Day Historical Volatility (Close-to-Close) of 0.1715 for 2025-10-06.
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