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SIE: Trading & Settlement
SIE practice questionhardAll-or-None Orders

A customer places an all-or-none (AON) order to buy 5,000 shares of a thinly traded stock at $12 limit. Only 3,000 shares are available at $12. What happens?

  1. AThe order is not executed because all 5,000 shares are not available at the limit price✓ Correct answer
  2. BThe remaining 2,000 shares are filled at the next available price
  3. CThe order is automatically canceled at the end of the day
  4. DThe order is filled for 3,000 shares at $12
Explanation

Why AThe order is not executed because all 5,000 shares are not available at the limit price

An all-or-none (AON) order requires the entire quantity to be filled or none at all. Since only 3,000 of the 5,000 requested shares are available at $12, the order is not executed. Unlike a fill-or-kill (FOK) order which must be filled immediately or canceled, an AON order can remain open. Partial fills (A, C) are not permitted with AON orders.

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