What is the Open Interest & Volume Adjustments index chart? The Open Interest and Volume Adjustments, which can be filtered by puts and calls, shows you how much the open interest changed overnight and how much volume traded across all expirations yesterday for a given index. This can give you a sense of where investors are positioned and what trading is taking paces across the major indices. SpotGamma Subscribers can access this chart for the SPX, SPY, NDX, QQQ, RUT and IWM. Related articles What is the Price Vs 2M/6M Realized Volatility index chart? What is the SpotGamma SIV Index? What is the Realized Volatility index chart? What is the Absolute Gamma index chart? What is the 5 Day & 30 Day Return Histogram?