Implied Volatility (Puts) (120-Day)
Implied Volatility (Puts): The forecasted future volatility of the security over the selected time frame, derived from the pricing of the at-the-money put options with the relevant expiration date.
Biogen Inc. (BIIB) had 120-Day Implied Volatility (Puts) of 0.3753 for 2025-05-09.
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