Stock Order Types Explained: Market, Limit, Stop and Stop-Limit Orders
Clicking buy is only half a trade; the order type decides the price you actually get. This guide explains market, limit, stop, stop-limit and trailing stop orders, how time-in-force settings work, what happens in fast markets and after hours, and the trade-offs each order type makes between speed and price.
When you buy or sell a stock, the broker asks two questions most beginners skip past: what kind of order is this, and how long should it stay open? The answers determine whether you get filled immediately at whatever the market offers, wait for a price you choose, or only act if the stock moves a certain way. None of the order types is "best." Each trades speed against price control, and knowing that trade-off is the difference between a deliberate trade and an unpleasant surprise.
If you have not set up an account yet, start with our guide to opening a brokerage account in the US. This article picks up at the order ticket.
First, the bid, the ask and the spread
Every listed stock has two prices at any moment:
- The bid: the highest price a buyer is currently willing to pay.
- The ask (or offer): the lowest price a seller is currently willing to accept.
The gap between them is the spread. For heavily traded large companies it is usually tiny; for small, thinly traded stocks it can be wide. The spread matters because a buyer using a market order typically pays around the ask, and a seller typically receives around the bid. Order types are, in large part, tools for managing where in and around that spread you trade.
Market orders: speed first
A market order tells the broker to buy or sell immediately at the best available price.
- Strength: during regular hours in a liquid stock, it almost always fills, and quickly.
- Weakness: you do not control the price. The quote you saw a moment ago is not guaranteed. In a fast-moving or thinly traded stock, or for a large order that eats through several price levels, the fill can be noticeably worse than expected.
Market orders suit situations where getting the trade done matters more than a few cents, in large, actively traded stocks or funds, during regular trading hours. They are a poor fit at the open and close, when prices can jump, and in anything with a wide spread.
Limit orders: price first
A limit order sets the maximum you will pay to buy, or the minimum you will accept to sell. It executes only at that price or better.
- A buy limit at $50 fills at $50 or lower.
- A sell limit at $60 fills at $60 or higher.
Strength: you never pay more, or receive less, than your limit. Weakness: the order may never fill. If the stock never reaches your price, or reaches it only briefly with other orders ahead of yours, you can miss the trade entirely. A limit order can also fill only partly, leaving the rest open.
Many investors use limit orders by default, setting the limit close to the current ask when buying, so they get the speed of a near-market order with a cap on the price.
Stop orders: action on a trigger
A stop order (often called a stop-loss when used to sell) waits until the stock trades at or through a trigger price, called the stop price, then becomes a market order.
- A sell stop at $45 on a stock now at $50 does nothing until the price falls to $45, then sells at the next available price.
- A buy stop above the current price can be used to enter a position only if the stock rises through a level.
The key point: a stop order guarantees action, not a price. If a stock closes at $48 and opens the next morning at $40 after bad news, a $45 sell stop triggers at the open and fills near $40, not $45. That overnight jump is called a gap, and it is the main limitation of stop orders.
Stop-limit orders: trigger plus a floor
A stop-limit order combines the two ideas. It has a stop price that activates the order and a limit price that sets the worst acceptable fill.
For example, a sell stop at $45 with a limit at $44 activates when the stock trades at $45, then sells only at $44 or better.
- Strength: no fills far below your intended price.
- Weakness: if the stock gaps or falls straight past $44, the order stays unfilled and you still own the shares as the price keeps dropping.
Trailing stops: a stop that moves
A trailing stop sets the stop price as a fixed dollar amount or percentage below the market price, and moves it up as the stock rises. If the stock falls back by the set amount from its high, the stop triggers. It never moves down.
Trailing stops are popular for protecting gains on a rising position without constant monitoring. They carry the same gap risk as ordinary stops, and in a volatile stock a tight trail can trigger on normal day-to-day swings.
The order types side by side
| Order type | Controls price? | Guarantees execution? | Main risk |
|---|---|---|---|
| Market | No | Nearly, in liquid stocks during regular hours | Worse fill than the quote |
| Limit | Yes | No | Missing the trade |
| Stop | No | Once triggered, nearly | Gaps and fast markets |
| Stop-limit | Yes | No | No fill as price falls through |
| Trailing stop | No | Once triggered, nearly | Triggering on normal volatility |
Time in force: how long the order lives
Every order also has a duration, set on the order ticket:
- Day: the order expires at the end of the trading session if not filled. This is the usual default.
- Good 'til canceled (GTC): the order stays open across days until it fills or you cancel it. Many brokers cancel GTC orders automatically after a set period, so check the rules.
- Immediate or cancel (IOC) and fill or kill (FOK): specialist instructions that require an immediate fill, in part or in full respectively, or cancel the order. Most long-term investors never need them.
An old GTC order is easy to forget. Review open orders periodically, especially after a stock split or a big price move, so nothing executes you no longer intend.
Extended hours, fractional shares and other wrinkles
- Pre-market and after-hours sessions have fewer participants and wider spreads. Most brokers that offer them accept only limit orders, and the order may need a specific extended-hours designation.
- Fractional share orders are often limited to market orders during regular hours, depending on the broker.
- Trading halts stop all trading in a stock temporarily; orders wait and may fill at very different prices when trading resumes.
- The open and close are often the most volatile minutes of the day, which matters most for market and stop orders.
Our explainer on how the US stock market works covers how exchanges match orders and how your broker routes them.
Matching the order to the situation
A simple way to think it through, without any order being right for everyone:
- Long-term purchase of a large, liquid fund or stock: a limit order near the current ask gives near-market speed with a price cap.
- Thinly traded or volatile stock: a limit order protects against a wide spread.
- Wanting a predefined exit if a position falls: a stop or stop-limit, chosen with the gap risk of each in mind.
- Placing an order outside regular hours: a limit order, often the only option.
Before your next trade, open the order ticket, read every field and its default, and decide deliberately what you are asking the market to do.
Frequently asked questions
What is the difference between a limit order and a stop order?
A limit order sets the worst price you will accept and only executes at that price or better. A stop order sits dormant until the stock trades at a trigger price, then becomes a market order and fills at whatever price is available. Limit orders control price; stop orders control when an order activates.
Does a stop-loss order guarantee I will sell at my stop price?
No. Once triggered, a standard stop order becomes a market order, so in a fast decline or an overnight gap the fill can be well below the stop price. A stop-limit order avoids that by refusing to sell below a set limit, but it may then not sell at all if the price falls straight through.
Can I use market orders outside regular trading hours?
Generally not. Most US brokers that offer pre-market and after-hours trading accept only limit orders in those sessions, because trading is thinner and prices can move sharply. Check your broker's extended-hours rules, which also explain which sessions your order is eligible for.
