Iceberg order
What is an iceberg order, and why can a large trade hide behind small visible pieces?
In plain words
An iceberg order is a large order placed with a trading venue so only a small slice is shown in the public order book at any moment. When that slice is filled, another is revealed, so a very large total amount is traded through repeated small displays rather than one big quote.
Why it matters
It matters for anyone reading a market because visible order-book depth understates real supply or demand. A price may move only slightly on heavy volume if a hidden buyer or seller absorbs orders slice by slice, so apparent scarcity can be misleading.
In a real week: BTC, week of 4 November 2024
In the week of 4 November 2024, BTC traded 2.27 times its prior 12-week volume on $24.43bn of dollar volume, and its largest 1-hour move was 2.74% on Wednesday 6 November at 02:00 UTC. Candles show price and volume, so any large orders filled as small visible slices during that week would be invisible in this data, no matter how large the total.
A common mistake
Treating quiet price action as thin trading. A market can absorb large hidden flow while candles look uneventful; candle data alone cannot confirm or rule out iceberg activity.