An iceberg order is a large financial transaction divided into smaller, consecutive orders to hide the total quantity from other market participants.
Mechanics of an iceberg order
Institutional investors and large-scale traders use iceberg orders to buy or sell substantial quantities of financial assets. If a massive order appears on the public order book, it alerts the market to an imbalance in supply or demand. This visibility often causes the asset’s price to change before the trader can execute their full order. Competing market participants might adjust their positions to profit from the anticipated price movement.
To prevent this price impact, the trader breaks the total transaction into smaller pieces. The trading platform or exchange algorithm requires two inputs: the total order size and the display size. The display size is the only portion visible to the market. Once the exchange executes the visible order, the system automatically submits a new order for the same display size. This cycle continues until the total order is complete.
Financial exchanges across global equity, commodity, and cryptocurrency markets support this order type. Fellow Elephants observing the order book will only see the small, displayed fraction of the trade. An observant trader might identify an active iceberg order if they notice continuous execution volume at a specific price level while the visible supply of shares or contracts does not deplete.
Example
Suppose an Elephant wants to buy 100,000 shares of an international agricultural firm on the London Stock Exchange. Placing a single bid for 100,000 shares will immediately signal high demand, prompting sellers to raise their asking prices. The Elephant instead submits an iceberg order with a display quantity of 5,000 shares. The order book shows a bid for only 5,000 shares. When sellers fill that 5,000-share order, another 5,000-share bid instantly appears. This process repeats twenty times. The Elephant successfully acquires the full 100,000 shares without causing a sudden spike in the share price.