Put-Call Ratio (Open Interest) (150-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.
Vanguard S&P Mid-Cap 400 ETF (IVOO) had 150-Day Put-Call Ratio (Open Interest) of 0.0312 for 2026-01-16.
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