Investing term
What is Stop-limit order?
A protective order that triggers a limit order when the price reaches a threshold.
A stop-limit order is a protective two-part order. When the price reaches your 'stop' trigger, it activates a limit order to buy or sell at your specified limit price or better. It combines a trigger — which watches the price for you — with the price protection of a limit order, so you don't sell into a runaway crash at any price.
That protection is also its weakness. In a fast-moving market the price can blow straight past your limit, activating the order but leaving it unfilled because no trade is available at your limit or better. A stop-limit protects you from a terrible fill, but at the cost of possibly no fill at all — which, when you're trying to cut a loss, can mean staying stuck in a falling position exactly when you wanted out.
A stop-limit triggers at your stop then only fills at your limit or better. If the price gaps straight past the limit, it activates but never fills — leaving you holding, exactly when you wanted out.
For example
You set a sell stop-limit triggered at $45 with a $44 limit; if the stock gaps straight to $40, the order activates but won't sell below $44 — leaving you still holding.
Learn it by doing
That's Stop-limit order in theory — it clicks when you use it. Practise it hands-on in a free, interactive lesson (Stage 7, Brokers, Accounts & Getting Started).
Try the free lesson →Why it matters to you
Stop-limit orders matter because they show the fundamental trade-off between price and certainty at its sharpest. A plain stop order guarantees you get out but not at what price; a stop-limit guarantees the price but not that you get out. Neither is universally right — which you'd want depends on whether your bigger fear is a terrible fill or being left holding. Understanding the gap-through risk is what stops investors from assuming a stop-limit is pure protection.
⚠ Assuming a stop-limit always protects you
A stop-limit can fail to execute exactly when you need it most. If the price gaps past your limit — common in a fast crash or on bad news — the order activates but doesn't fill, leaving you holding a falling position. Investors who set one expecting guaranteed protection can be caught out. If getting out matters more than the price, a plain stop may fit better.