Stop Order vs. Stop-Limit vs. Limit Order: How Each Works and the Risks
Market, limit, stop, and stop-limit orders each give you a different tradeoff between certainty of execution and certainty of price. Here's how they work, with examples of what can go wrong.
Every stock order has to answer two questions: at what price and how certain are you to get filled? Different order types make different tradeoffs between those two. You generally can't have certainty on both.
Market Order
A market order says: buy or sell right now at the best available price.
- Certainty of execution: very high for liquid stocks.
- Certainty of price: none. You get whatever the market offers. In a fast-moving or thinly traded stock, the fill can be well away from the last price you saw.
Limit Order
A limit order says: buy or sell only at this price or better.
- A buy limit at $50 fills at $50 or lower.
- A sell limit at $50 fills at $50 or higher.
- Certainty of price: high; you won't pay more or receive less than your limit.
- Certainty of execution: none. If the market never reaches your price, the order doesn't fill.
Stop Order (Stop-Loss)
A stop order sits dormant until the stock trades at a stop price, and then becomes a market order.
Example. You own shares at $50 and place a sell stop at $45. If the stock trades at $45 or lower, the order turns into a market order and sells at the next available price.
- Certainty of execution: high once triggered.
- Certainty of price: none. The fill can be below the stop price. This difference is called slippage.
Stop orders are commonly used to limit a loss or to enter a trade when price breaks above a level (a buy stop).
Stop-Limit Order
A stop-limit order has two prices: a stop price (the trigger) and a limit price (the worst price you'll accept). When the stop price is hit, the order becomes a limit order, not a market order.
Example. You own shares at $50 and place a sell stop-limit with a stop at $45 and a limit at $44. If the stock falls to $45, a limit order to sell at $44 or better is activated.
- Certainty of price: you won't sell below $44.
- Certainty of execution: none. If the stock gaps from $46 to $42, price is already below your limit and the order may never fill, leaving you holding a falling stock.
Side by Side
| Order | Triggers at stop? | Becomes | Price certainty | Fill certainty |
|---|---|---|---|---|
| Market | n/a | Market | Low | High |
| Limit | n/a | Limit | High | Low |
| Stop | Yes | Market | Low | High (after trigger) |
| Stop-limit | Yes | Limit | High (after trigger) | Low |
What Can Go Wrong
- Gaps. Stocks can open far above or below the prior close after news. A stop at $45 on a stock that gaps to $38 will typically fill near $38, not $45. A stop-limit may not fill at all.
- Fast markets. In volatile moments, prices move quickly and fills can diverge from stop levels.
- Triggers differ. Brokers define the trigger differently (last trade price, bid, or ask). Check your broker's rules.
- Extended hours. Many stop orders only trigger during regular trading hours unless specified otherwise.
- Brief dips can trigger stops. A momentary drop can sell you out of a position that quickly recovers. See false breakouts for a similar dynamic on the upside.
- A stop is not a guarantee. It's an instruction, and the outcome depends on market conditions.
Related Order Types
- Trailing stop: the stop price follows the stock's price upward by a set amount or percentage, but doesn't move down.
- Day vs. good-til-canceled (GTC): how long the order stays active.
- Bracket and OCO orders: combinations that place a profit target and a stop together, where one cancels the other.
Choosing
There's no universally correct choice. The choice depends on whether it matters more to get filled or to control the price, and how liquid the stock is. Wide bid-ask spreads make limit orders especially useful.
This article is for educational purposes only and is not investment advice. Order handling varies by broker.
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