Put-Call Ratio (Open Interest) (180-Day)
Put-Call Ratio (Open Interest): The ratio of outstanding put contracts to outstanding call contracts at the close of the trading day, for options with the relevant expiration date.
State Street SPDR S&P Biotech ETF (XBI) had 180-Day Put-Call Ratio (Open Interest) of 0.6747 for 2026-01-20.
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