Order Types · Forex Glossary
FOK (Fill or Kill) — Definition & Meaning in Forex Trading
A clear, practical definition of fok (fill or kill) written for EU retail forex traders.
Quick Answer
FOK (Fill or Kill): An order that must be executed immediately and in full, or it is cancelled entirely. No partial fills are allowed. FOK orders are used when a trader needs the full position size at a specific price or not at all.
What does FOK (Fill or Kill) mean?
FOK (Fill or Kill) is a order types concept every forex trader should understand. An order that must be executed immediately and in full, or it is cancelled entirely. No partial fills are allowed. FOK orders are used when a trader needs the full position size at a specific price or not at all. Traders encounter fok (fill or kill) throughout day-to-day decision-making, and a solid grasp of the idea helps avoid costly mistakes — especially for EU retail traders operating under ESMA rules where leverage caps, negative balance protection, and investor compensation schemes all intersect with practical trading concepts like this one.
How is FOK (Fill or Kill) used?
In practice, FOK (Fill or Kill) is an execution feature built into every mainstream retail trading platform, from MetaTrader 4 and MetaTrader 5 through to cTrader and proprietary broker terminals. You select fok (fill or kill) in the order ticket when opening or modifying a position. Active traders rely on fok (fill or kill) to automate both entries and exits without needing to monitor the market continuously.
Example
Related Terms
Other order types concepts worth knowing.
Fill
The execution of an order. A fill occurs when a broker matches your order at a specific price. Partial fills happen when only part of the order is executed.
Limit Order
An order to buy or sell at a specified price or better. A buy limit is placed below the current price; a sell limit is placed above. The order will only fill at the limit price or a more favorable one.
Market Order
An order to buy or sell immediately at the best available price. Market orders guarantee execution but not a specific price, especially in fast-moving or illiquid markets.
Stop Loss
An order placed to close a position at a predetermined price to limit losses. Once the price reaches the stop level, the order becomes a market order. Stop losses are a cornerstone of risk management.
Take Profit
An order placed to automatically close a position when the price reaches a specified profit target. Take profit orders lock in gains and remove the need to manually monitor open positions.
Trailing Stop
A dynamic stop loss that moves with the market price by a set distance. As the price moves in your favor, the stop follows; if the price reverses, the stop stays in place, protecting accumulated profits.
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