Stop Order

What is a stop order?

A stop order is an instruction that stays inactive until the market reaches a chosen trigger price, at which point it converts into a market order and executes at the next available price. It is a type of pending order, but unlike a limit order, it is designed to trigger with the direction of the move rather than against it.

How it works

A buy stop is placed above the current price and is used to enter a long trade if price breaks upward through a level — for example, above resistance during a breakout. A sell stop is placed below the current price, used to enter a short trade if price breaks downward, or to exit an existing long position as a stop-loss once losses reach a set point.

Worked example

Suppose USD/JPY is consolidating just under 150.00, and a trader expects a strong move if it breaks above that level. Placing a buy-stop order at 150.05 means the order sits dormant while price stays below it; if price rises and touches 150.05, the order triggers and fills as a market order near that level, entering the trader into the breakout.

Stop order vs. stop-limit order

A plain stop order guarantees the trade will happen once triggered, but — like any market order — not at a guaranteed price, so it can suffer slippage in fast markets. A trader who wants a price cap on the fill can instead use a stop-limit order, which adds a maximum acceptable price to the trigger.

Why it matters

Stop orders are the mechanism behind two very different use cases: entering breakouts (buy-stop above resistance, sell-stop below support) and protecting open positions from further loss (a stop-loss is simply a stop order attached to a live trade). Understanding how and when a stop order converts to a market order — and the slippage risk that comes with it — is a core building block of disciplined risk management.

Trading carries a high level of risk and may not be suitable for all investors.