Forex glossary

One Cancels Other Order (OCO) in Forex

A clear definition of One Cancels Other Order (OCO), with practical context for reading markets and making better trading decisions.

Level 2 · From Prices to PracticeOrders & execution

Definition

A One Cancels Other Order (OCO) is a pair of linked orders where execution of one order cancels the other. The two instructions are designed so only one remains relevant after the first is triggered.

How It Works

Orders are instructions, and their exact behavior depends on the conditions attached to them: price, quantity, timing, and what should happen if execution is only partly available. Before confirming an order, read the order type and validity fields rather than assuming every instruction behaves like a market order.

Why It Matters

This matters because two orders aimed at the same market can produce very different outcomes. Level 2 treats order mechanics as a safety skill: configure the instruction you actually intend, then review it before submission.

Key Takeaway

A One Cancels Other Order (OCO) is a pair of linked orders where execution of one order cancels the other.

Practical forex example

A demo platform links a sell limit at 1.1100 with a protective sell stop at 1.0900. If the limit executes, the stop is cancelled under the OCO relationship.

Why One Cancels Other Order (OCO) matters

Understanding One Cancels Other Order (OCO) helps traders interpret market information, plan decisions, and manage risk with more context.

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