Put-Call Implied Volatility Ratio (180-Day)
Put-Call Implied Volatility Ratio: The ratio of implied volatilities of the at-the-money puts to the at-the-money calls.
State Street SPDR S&P Biotech ETF (XBI) had 180-Day Put-Call Implied Volatility Ratio of 0.9875 for 2026-10-16.
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