FOK Order (Fill or Kill)
A FOK order must fill completely and immediately, or it cancels entirely. No partial fills allowed—it's all or nothing.
Understanding the Concept
FOK orders are used when you need the exact size or nothing at all. Partial fills can mess up position sizing, hedging strategies, or arbitrage trades where precise amounts matter. If the order book can't satisfy your full order instantly, you don't want pieces of it. It's stricter than IOC (which allows partials). FOK orders are less common for retail traders but essential for certain algorithmic strategies and professional trading desks. Most exchanges support them, but check your platform.
Real-World Example
You want exactly 50 ETH for a hedging strategy. You place a FOK order at $2,000. The order book has only 45 ETH at that price—order is killed. You wait for liquidity to build and try again.
How Strykr Helps
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