A fill or kill (FOK) order is "an order to buy or sell a stock that must be executed immediately"—a few seconds, customarily—in its entirety; otherwise, the entire order is cancelled; no partial fulfillments are allowed. Characterized as "extreme orders", FOK orders are "most commonly used when your order is for a large quantity of stock and is usually a market or limit order that requires immediate execution".
A fill or kill (FOK) order is "an order to buy or sell a stock that must be executed immediately"—a few seconds, customarily—in its entirety; otherwise, the entire order is cancelled; no partial fulfillments are allowed. Characterized as "extreme orders", FOK orders are "most commonly used when your order is for a large quantity of stock and is usually a market or limit order that requires immediate execution".
Source: Wikipedia "Fill or kill" · CC BY-SA 4.0
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