FOK

Fill or Kill (FOK): An Immediate and Binding Order
A Fill or Kill (FOK) order is an instruction to buy or sell a security immediately in its entirety, or else the order is canceled completely. These orders are typically used to ensure that transactions do not suffer delays or partial completions.
Fill or Kill (FOK) Order: Immediate Execution or Cancellation in Trading
An in-depth look at Fill or Kill (FOK) orders, their usage in equity markets, why they require immediate and complete execution, and typical scenarios where they are applied.

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