A BISI stands for Buy Side Imbalance, Sell Side Inefficiency
. It acts as the exact opposite of a SIBI and represents a bullish liquidity void
. A BISI forms when the market breaks aggressively out of a period of equilibrium or consolidation, delivering price in long, one-sided upward ranges or consecutive up-close candles
. During this aggressive displacement, price delivery is completely one-sided. This means only buy-side liquidity is delivered, leaving behind a complete void of sell-side liquidity
. Because this heavy buying is driven by “smart money” pushing the price higher without corresponding sellers, it creates an imbalance on the buy side and an inefficiency on the sell side