Immediate or canceled order
Immediate or canceled order (IOC order)
Market or limited price order that is to be executed in whole or in part as soon as such order is represented in the trading crowd. The portion not executed is to be treated as canceled. A stop is considered an execution in this context. See: AON order, FOK order.
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An order from a broker to buy or sell a security or derivative, usually in large quantities, in which investors have a short period of time to partially or completely fulfill the order before it is cancelled. An IOC may be considered the opposite of a good 'til cancelled (GTC) order; it differs from a fill-or-kill (FOK) order because an IOC may only be partially filled, while an FOK must be entirely filled or the whole offer is void. An IOC is considered a type of day order, but has a much shorter time frame. See also: All-or-none offering.
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