What Is Iceberg Order?
An iceberg order is a large order where only a small portion shows on the order book at any time. As each visible chunk fills, the next one appears. Total size is hidden — the market only sees the 'tip of the iceberg.'
Institutions use iceberg orders to execute large positions without spooking the market. If a 100,000-share buy order appeared at once, it would signal massive demand and push the price up against the buyer. Splitting it into 5,000-share clips spread over an hour keeps the impact smaller.
Iceberg orders are mostly relevant on professional platforms and direct-market-access brokers. Retail traders rarely use them because retail orders are too small to need hiding. But understanding them helps interpret unusual volume patterns — sustained execution at one price often indicates iceberg activity.
Related terms
- Limit Order — An order to buy or sell at a specified price or better — guarantees price, not execution.
- Market Order — An order to buy or sell immediately at the best available price — guarantees execution, not price.
- Liquidity — The ease with which an asset can be bought or sold without significantly affecting its price.
- Slippage — The difference between the expected fill price of an order and the actual execution price.