Definitions for "FILL OR KILL ORDER"
Keywords:  fok, aon, cancel, entirety, crowd
This means do it now if the option (or stock) is available in the crowd or from the specialist, otherwise kill the order altogether. Similar to an all-or-none (AON) order, except it is "killed" immediately if it cannot be completely executed as soon as it is announced. Unlike an AON order, the FOK order cannot be used as part of a GTC order.
A trading order that is canceled unless executed within a designated time period. A market or limited price order that is to be executed in its entirety as soon as it is represented in the trading crowd, and, if not so executed, is to be treated as canceled. For purposes of this definition, a stop is considered an execution. Equivalent to AON and IOC simultaneously.
A trading order that is canceled unless executed within a designated time period. Related: open order.
Keywords:  better, instruction, buy, sell, stock
an instruction to buy or sell UK stock at, or better than, a specified price when the market next opens