Fill or Kill (FOK) Order: Execute Instantly or Cancel Completely

A Fill or Kill (FOK) order is an advanced trading order that must be executed in full immediately or canceled entirely. There is no possibility of partial execution—either the entire order is filled at once, or it does not execute at all.

What is a Fill or Kill Order?

A FOK order is a type of order that:

• Must be executed instantly
• Must be filled 100% in full
• Is automatically canceled if full execution is not possible
  

This ensures that traders either get exactly what they want or avoid entering the market altogether.

Simple Explanation

A Fill or Kill order means:

“All or nothing, right now.”

If the market cannot provide enough liquidity to fill the entire order immediately, the order is canceled without any partial fills.

How It Works

When you place a FOK order:

1. The exchange checks available liquidity at your specified price
2. If the full amount is available → the order executes instantly
3. 
   If not → the order is canceled immediately
   

Example

• You want to buy 10 BTC at $30,000
• Only 6 BTC are available at that price
  

Result:

The order is canceled because it cannot be filled بالكامل (note: removed Arabic, so simply: cannot be fully filled)

Why Traders Use FOK Orders

• Avoid partial fills
• Ensure precise position sizing
• Execute large orders efficiently
• Maintain strict control over execution
  

FOK vs Other Order Types

Advantages

• Full control over trade execution
• No partial positions
• Useful for large or strategic trades
  

Disadvantages

• May not execute at all
• Requires sufficient liquidity
• Can lead to missed opportunities
  

When to Use FOK

• When executing large trades
• When precision is critical
• In highly liquid markets
• For advanced trading strategies
  

A Fill or Kill (FOK) order is designed for traders who require immediate and complete execution. It eliminates uncertainty by ensuring that trades are either fully completed or not executed at all.

Key takeaway: If the market cannot fill your entire order instantly, the trade is canceled.