Use a market order when you prioritize getting a stock trade executed over controlling its exact price. Use a limit order when you want to set the most you will pay to buy or the least you will accept to sell—and can accept that the order may not fill. Neither type guarantees both execution and price. Check your broker’s rules, particularly for trading outside regular hours.
Market order vs. limit order at a glance
| Consideration | Market order | Limit order |
|---|---|---|
| Main priority | Seek execution at the best available price, generally promptly. | Set a price boundary: a buy limit is at the limit price or lower; a sell limit is at the limit price or higher. |
| What is not guaranteed | The exact execution price. | Execution; the market must reach the limit and shares must be available for the order to fill. |
| Typical tradeoff | More emphasis on execution, less price certainty. | More control over price, less certainty of execution. |
The SEC explains that a market order’s execution price can differ from the last-traded price or the quote you saw when placing it. Quotes can change while an order is routed, and displayed prices apply only to limited quantities. A large market order may therefore fill in parts at several prices if there are not enough shares available at one price. See the SEC’s Understanding Order Types and Executing an Order.
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When a market order makes sense
A market order may suit you when completing the trade is more important than setting a precise price, and you accept that the final price may differ from the last trade or displayed quote. It seeks the best available price when the order reaches a market; it does not lock in the price shown on your screen.
That distinction matters for larger orders or when available liquidity at a quoted price is limited: different portions can execute at different prices. The SEC also notes that an online order is routed by your broker rather than sent directly from your account to an exchange. The price can move during that process. Brokers have a duty to seek the best execution reasonably available, weighing factors that include the chance of price improvement against the time execution may take. Price improvement is possible, not assured.
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When a limit order makes sense
A limit order may suit you when you have a firm price boundary and would rather wait—or not trade—than cross it. A buy limit caps what you pay; a sell limit sets the minimum you accept. The order can execute only at the limit price or better for you.
That boundary is not a promise that the trade will happen. The market must reach the limit, and a fill must be available. If the price never reaches your limit, or moves away before your order fills, the order can remain unexecuted. The SEC describes these mechanics in its order-types bulletin and Types of Orders guide.
What to check before submitting either order
- Current bid and ask: Review the current quotes, while remembering that they can change before your order is routed or executed.
- Share quantity: Consider how the order size relates to the displayed quantity; a large market order may execute at multiple prices.
- Order duration: Check how long the order remains active. Day and good-til-canceled instructions are common, but available durations and cancellation deadlines vary by broker.
- Broker rules: Firms can offer different order types or use similar labels for instructions with important differences. Confirm the firm’s policies and what happens to an unfilled order.
- Trading session: For extended-hours trading, check which order types your firm accepts and what protections apply. The SEC says many firms currently accept only limit orders during extended hours to help protect customers from unexpectedly bad prices; accepted orders and conditions vary. See its Extended-Hours Trading bulletin.
A simple decision rule
- Choose a market order if getting the trade done is your priority and you accept price uncertainty.
- Choose a limit order if you have a maximum purchase price or minimum sale price and are willing to risk no execution.
This explains order mechanics; it is not a prediction of a stock’s value or an individualized investment recommendation. The SEC notes that its investor bulletin reflects staff views and is not a Commission rule or regulation.
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