Historical Volatility (Close-to-Close) (150-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.
State Street SPDR Bloomberg 3-12 Month T-Bill ETF (BILS) had 150-Day Historical Volatility (Close-to-Close) of 0.0019 for 2026-04-20.
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