Fill or Kill (FOK) - Forex Glossary | ForexCracked
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Orders & Execution Advanced

Fill or Kill (FOK)

Also called: FOK

An order that must fill entirely and immediately, or be cancelled — no partial fills allowed.

01

Definition

FOK is an execution instruction used mostly in institutional and ECN trading. The order must fill in full, at the specified price, the instant it hits the venue — otherwise it’s cancelled.

Rarely needed in retail FX (typical retail orders fill in full anyway at the broker’s quoted price), but available on some ECN platforms.

02

Example

You submit a 50-lot FOK buy limit at 1.0800. The order book shows only 30 lots available at 1.0800. The order is killed — you don't get the 30 lots.