Historical Volatility (Close-to-Close) (180-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.
ACI Worldwide, Inc. (ACIW) had 180-Day Historical Volatility (Close-to-Close) of 0.2766 for 2026-01-16.
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