By Marco BösingWhat Is an Iceberg Order?
An iceberg order (also called a hidden order or reserve order) is a large limit order that the exchange splits into multiple small, visible portions. Only the display quantity appears in the order book, while the majority of the order remains hidden — like an iceberg where only the tip is visible above the surface.
When the displayed portion is executed, the exchange automatically replenishes the next portion. This allows an institutional trader to build a position of, say, 500 contracts without ever showing more than 10 contracts in the order book.
Why Are Iceberg Orders Used?
Institutional market participants use iceberg orders for one central reason: minimizing market impact. A visible 500-contract order in the order book would alert other market participants and move price against the originator before the order is fully executed.
By splitting into small visible tranches, the true intention remains hidden until the order is completely filled.
How to Detect Iceberg Orders
Although iceberg orders are hidden, they leave traces:
In the Order Book (DOM)
- A consistent bid or ask size at a level that does not decrease despite repeated executions suggests an iceberg order
- The level is repeatedly "replenished" as soon as the visible quantity is executed
In the Tape (Time & Sales)
- Many small, equally-sized executions at the same price level in rapid succession is a classic iceberg pattern
- Executions appear with constant size even though the visible order book shows only a small quantity
In the Footprint Chart
- High cumulative volume at a single price level that contradicts the visible order book depth
- The level shows absorption: significant volume is traded but price does not move
Iceberg Orders in the Trading Context
Iceberg as Support or Resistance
A price level where an iceberg order sits can act as strong support (bid iceberg) or resistance (ask iceberg). Price repeatedly bounces off this level because the hidden liquidity absorbs the aggressive orders.
Iceberg vs. Spoofing
Unlike spoofing, where large visible orders are placed and canceled before execution, an iceberg order is a real order intended to be executed. Icebergs are a legitimate order management tool; spoofing is illegal.
Significance for Retail Traders
For retail traders, iceberg orders are valuable because they reveal the position of a large market participant. When you identify an iceberg order, you know that an institutional player is actively building or defending a position at that price level.
Frequently Asked Questions
Do iceberg orders exist at all exchanges?
Most major futures exchanges (CME, Eurex, ICE) support iceberg orders as a native order type. Functionality and minimum display quantity requirements vary by exchange and instrument.
Can I see iceberg orders in any trading software?
No. Detecting iceberg orders requires software that offers order book reconstruction or specialized iceberg detectors. Platforms like Sierra Chart, Bookmap, or Jigsaw Trading provide such features.
How large are typical iceberg orders?
Size varies by instrument and market conditions. In ES futures, iceberg orders can encompass several hundred to a thousand contracts, while in NQ futures, icebergs starting at 50-100 contracts can be significant.