How do iceberg orders help reduce market impact and promote liquidity?

The correct answer is A . An iceberg order is a large order in which only a limited portion of the total quantity is displayed to the market at any given time, while the remaining quantity is held in reserve. CIRO materials describe iceberg orders as large orders “where only a small portion of the order shows on the quote screen.”

This structure can reduce market impact because other market participants do not immediately see the full size of the buyer's or seller's interest. Revealing a very large order could influence prices adversely—for example, a large visible buy order may encourage sellers to increase asking prices. By displaying a smaller quantity, the trader can expose liquidity progressively while still contributing visible volume to the order book.

A is therefore the best answer. B is incorrect because an iceberg order is partially displayed , not completely hidden. CIRO specifically distinguishes an iceberg order from a fully dark order; the displayed portion contributes to price discovery and market liquidity. C is the opposite of an iceberg structure because the entire quantity is not displayed. D is also incorrect because iceberg orders can operate on transparent marketplaces and are not defined by execution in a dark pool.

The CIRE syllabus expressly includes iceberg orders among the order types candidates must understand.

Study Guide Reference: CIRE Element 6.6 — Features of different order types; UMIR order-entry and exposure framework.

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