Investing Answers Building and Protecting Your Wealth through Education Publisher of The Next Banks That Could Fail
Investing Answers Building and Protecting Your Wealth through Education Publisher of The Next Banks That Could Fail

Fill or Kill (FOK)

What it is:

Fill or kill (FOK) is a client's instruction to his or her broker to either fill the entire order immediately or to cancel the order.

How it works (Example):

Let's assume you want to purchase 1 million shares of Company XYZ at $20 per share. You might instruct your broker to "fill it or kill it," meaning that your broker should buy the entire one million shares at $20 a share within a few seconds or do nothing at all. 

Why it Matters:

When traders are aware of a big order, they will drive the price up, thinking that the big buyer will be willing to pay more. Fill or kill orders are useful in these circumstances because the investor can attempt to lock in a certain price.