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 Short 20+ Year Treasury (TBF) had 30-Day Historical Volatility (Close-to-Close) of 0.1136 for 2026-09-01.
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