Placing a trade involves more than deciding what to buy or sell. You also need to determine how you want the order executed.

Two of the most common choices are market and limit orders. A market order prioritizes getting the trade completed, while a limit order prioritizes the price. Understanding that distinction can help you avoid unexpected execution prices, partially completed trades, or orders that never fill.

Market Orders Prioritize Execution

A market order instructs your brokerage to buy or sell an investment at the best available price when the order reaches the market.

The main advantage is speed. During normal market conditions for a liquid investment, the order is generally designed to execute promptly.

What you don't control is the exact price.

The quote you see when you submit the order isn't necessarily the price you'll receive. Prices can move between order submission and execution, particularly when markets are volatile or the investment trades infrequently.

This difference is commonly known as slippage.

Limit Orders Give You More Control Over Price

A limit order allows you to establish a maximum purchase price or minimum selling price.

Suppose a stock is trading at $12, but you don't want to pay more than $10. You could enter a buy limit order at $10.

If the market never reaches an eligible price, the order won't execute.

If the price falls to $10 or lower, the order becomes eligible to fill. However, reaching your limit doesn't necessarily guarantee that every share will be purchased.

Partial Fills Can Leave an Order Incomplete

Imagine you place a limit order to sell 20 shares at $35.

If enough buyers are available at an eligible price, all 20 shares could sell. But if only eight shares can be matched under your order's conditions, you could receive a partial fill.

The remaining 12 shares would stay unsold unless another eligible transaction becomes available before the order expires or is canceled.

This illustrates the fundamental compromise with limit orders: you gain greater control over the price but give up certainty about execution.

Limit Orders Can Expire

A limit order doesn't necessarily remain active indefinitely.

Common duration settings include:

  • Day order: Generally remains active for the trading day and expires if it isn't filled.
  • Good-'til-canceled order: Remains active for a longer period, subject to the brokerage's expiration policies.

Rules can vary between platforms. Extended-hours trading may also have separate requirements, so check when your order is eligible for execution.

Seeing Your Limit Price Doesn't Guarantee a Fill

A stock chart showing that an investment reached your limit price doesn't necessarily mean your order should have executed.

There must be enough buying or selling interest on the other side of the transaction. Other orders may also have priority based on price, time, or applicable market rules.

Consequently, a limit order might remain unfilled or partially filled even if the displayed market price briefly reaches your limit.

Not Every Investment Uses Limit Orders

Limit orders are commonly associated with securities that trade continuously during market sessions, including stocks and ETFs.

Mutual funds operate differently.

Traditional mutual fund transactions generally execute using the fund's net asset value calculated after the market closes rather than continuously changing intraday prices. As a result, you generally don't place conventional intraday limit orders for mutual funds.

Available order types can also vary by asset and brokerage.

Stop-Limit Orders Add Another Condition

A stop-limit order combines a trigger price with a limit price.

For example, you might establish a stop price that activates the order once an investment reaches a particular level. Once triggered, the order becomes a limit order and will execute only at the specified limit price or better.

This can provide additional price control, but execution still isn't guaranteed.

During a rapidly moving market, the price could move through the allowable range before the order can be filled, leaving you with some or all of the position.

Consider Liquidity and Volatility

The difference between market and limit orders becomes particularly important when an investment has low trading volume or its price is moving rapidly.

A market order placed in a highly liquid investment may encounter many available buyers or sellers near the quoted price.

A thinly traded security can be different. There may be a wider gap between the highest available buying price and lowest available selling price, increasing the possibility of an unexpected execution price.

A limit order can establish a boundary in these circumstances, although doing so introduces the possibility that the trade won't happen.

Match the Order to Your Priority

Neither order type is automatically appropriate for every transaction.

A market order may make sense when completing the transaction is more important than controlling small price differences. A limit order may be useful when you have a specific maximum buying price or minimum selling price and are comfortable with the possibility that the order won't execute.

Before submitting any trade, check three details: the order's duration, whether the investment supports the selected order type, and what could happen if only part of your requested quantity can be filled.

The central trade-off is straightforward. Market orders prioritize execution but don't guarantee the final price. Limit orders control the acceptable price but don't guarantee execution. Knowing which outcome matters more to you can make choosing between them much easier.