PFF Open Interest Trends

Long Liquidation happens when there is a decrease in open interest along with a decrease in implied volatility, indicating that traders are trying to sell out of their long positions in the option.

Long Buildup is an increase in open interest along with an increase in implied volatility, indicating that traders are adding to long positions in the option.

Short Buildup is an increase in open interest but a decrease in implied volatility, suggesting that traders are selling more contracts on short positions in the option.

Short Covering is a decrease in open interest but an increase in implied volatility, suggesting that traders are buying back to cover short positions in the option.