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How Does a “Fill or Kill” Order Differ from an “Immediate or Cancel” Order?

FOK requires immediate and full execution or cancellation; IOC allows immediate partial execution, canceling the rest.
Greeks.Live22.11.25

How Does a “Fill or Kill” Order Differ from an “Immediate or Cancel” Order?

A "Fill or Kill" (FOK) order must be executed immediately and in its entirety; otherwise, the entire order is canceled. An "Immediate or Cancel" (IOC) order must be executed immediately, but partial fills are allowed.

Any unexecuted portion of an IOC order is canceled. FOK is stricter, requiring full execution.

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