Icebergs are hidden orders that only reveal part of their size. On the DOM or Tape, it looks like the same price level keeps refreshing even as thousands of contracts trade into it. This is passive liquidity — a large player absorbing flow without showing their full hand.
- How they appear: You’ll often see aggressive sellers slamming the bid (negative delta stacking up), yet the price doesn’t move lower. The bid refreshes again and again — that’s an iceberg absorbing. The same logic applies on the ask when buyers are absorbed.
- What it signals: Icebergs usually show up at inflection points — lows, highs, VWAP, or key profile levels. When absorption holds, it often precedes a sharp reversal as aggressors run out of fuel. If absorption breaks, it can unleash a powerful breakout in the aggressor’s direction.
- Reading intent: The key is not just that an iceberg exists, but whether it holds. If the hidden wall keeps absorbing and price stalls, that’s meaningful. If it suddenly lifts, it tells you the liquidity was a bluff or that the big player stepped aside.
- Trade application: I look for icebergs as confirmation of reversals or failed breaks. They give me confidence that real size is defending a level and that fading the aggressors has edge.
In short: an iceberg is the invisible hand — real liquidity that soaks up aggression until the other side gives up.