What Are Order Types?
Every time an investor buys or sells a stock, they must tell their broker how they want the trade executed. These instructions are known as order types, and they determine the conditions under which a trade enters the market. While buying and selling may seem simple, the mechanics behind order execution can dramatically affect the price you receive, the speed of execution, and the overall outcome of a trade. Different order types exist because investors have different goals: some want immediate execution, others want precise price control, and others want to manage risk automatically. Choosing the wrong order type can lead to poor fills, missed opportunities, or unexpected losses; especially during volatile market conditions. Understanding order types is therefore one of the most important foundational skills for any investor or trader.
The most common order types are:
Market orders
Limit orders
Stop orders
Stop‑limit orders
Trailing stop orders
These order types are used by both long‑term investors and active traders, though each group may apply them differently depending on strategy, risk tolerance, and market conditions.
Before diving into each order type, it’s important to understand the difference between going long and selling short, since order types apply to both.
Going Long vs. Selling Short
Going Long
Going long is the traditional and most common way people invest. When an investor goes long, they buy shares with the expectation that the stock price will rise over time. If the stock increases in value, the investor can later sell the shares for a profit. Long positions benefit from upward price movement and are generally considered less risky because the maximum loss is limited; a stock can only fall to zero.
Long positions can be held for minutes, hours, months, or decades depending on the investor’s strategy. Day traders may hold long positions for only a few minutes, while retirement investors may hold for decades. Long investing is also supported by the natural long‑term upward trend of the stock market, which historically grows over time as companies expand, innovate, and generate profits.
Selling Short
Short selling is a more advanced strategy that works in the opposite direction. Instead of buying shares first, the investor borrows shares from their broker and sells them immediately, hoping the price will fall. If the stock declines, the investor buys the shares back at the lower price, returns them to the broker, and keeps the difference as profit.
Short selling introduces unique risks. Because a stock’s price can theoretically rise indefinitely, losses on a short position are unlimited. A stock that unexpectedly rallies — due to news, earnings, or a short squeeze — can force short sellers to buy back shares at much higher prices, resulting in large losses. For this reason, brokers require margin accounts, collateral, and special approval before allowing short selling. Short selling can be a powerful tool, but it requires discipline, risk management, and a deep understanding of market behavior.
Market Orders
A market order is the simplest and most commonly used order type. It instructs a broker to buy or sell shares immediately at the best available price. Market orders prioritize speed over price precision, making them ideal when entering or exiting a position quickly is more important than achieving a specific price.
Market orders interact directly with the bid‑ask spread. A market buy order executes at the current ask price, while a market sell order executes at the current bid price. In highly liquid stocks, this spread is often only a few cents wide, resulting in minimal slippage. But in thinly traded stocks, the spread can be wide, and a market order may fill at significantly worse prices than expected.
Market orders can also “walk the book.” If the order size is large relative to available liquidity, the order may fill across multiple price levels, resulting in a higher average purchase price or lower average sale price. This effect becomes more pronounced during volatile markets, at market open, or in after‑hours trading.
Market orders are best suited for:
Highly liquid stocks
Large‑cap companies
Index funds
Situations where immediate execution is critical
They are less suitable for volatile stocks, penny stocks, or low‑volume securities where slippage can be severe.
Market Order Example
A stock is currently quoted at:
Bid price: $49.95
Ask price: $50.05
An investor places:
Market buy order for 100 shares
Because market orders prioritize speed:
The order executes immediately
Shares are purchased near the current ask price of $50.05
If the market is moving quickly:
The final execution price may be slightly higher or lower
The investor has no guaranteed price protection
Limit Orders
A limit order allows investors to specify the maximum price they are willing to pay when buying or the minimum price they are willing to accept when selling. Limit orders prioritize price control over execution certainty. They execute only at the limit price or better, meaning investors can avoid overpaying or underselling during volatile conditions.
Limit orders are especially useful when:
A stock is moving quickly
Liquidity is low
The bid‑ask spread is wide
The investor wants a specific entry or exit price
Buy limit orders help investors avoid chasing prices higher, while sell limit orders help lock in profits at predetermined levels. Limit orders also help remove emotion from trading by allowing investors to plan entries and exits in advance.
However, limit orders may not execute at all if the stock never reaches the specified price. Even if the price touches the limit level, execution is not guaranteed because other orders may be ahead in the queue or there may not be enough liquidity. Partial fills are also common, especially in fast‑moving markets.
Buy Limit Order Example
A stock trades at $100.
An investor believes the stock is overpriced and wants a better entry price.
The investor places:
Buy limit order at $95
If the stock falls to $95 or lower:
The order becomes eligible for execution
Shares may be purchased at $95 or better
If the stock never reaches $95:
The order remains unfilled
Sell Limit Order Example
A stock currently trades at $80.
An investor wants to take profits only if the stock rises further.
The investor places:
Sell limit order at $90
If the stock rises to $90 or higher:
The order executes
Shares sell at $90 or better
If the stock never reaches $90:
The order expires unfilled
Stop Orders
A stop order becomes active only after a stock reaches a specific price called the stop price. Once triggered, the stop order converts into a market order and executes at the next available price. Stop orders are primarily used for risk management, protecting profits, or entering momentum trades.
Stop‑loss orders help investors automatically exit positions if a stock falls to a predetermined level, preventing small losses from becoming catastrophic. Buy stop orders help traders enter positions only if a stock breaks above a key resistance level, signaling potential upward momentum.
However, stop orders do not guarantee execution at the stop price. Because they become market orders once triggered, they may fill at significantly worse prices during gaps, volatility, or news events. This is known as gap risk, and it is one of the biggest drawbacks of stop orders.
Stop orders are powerful tools, but they must be placed thoughtfully to avoid triggering prematurely during normal market fluctuations.
Sell Stop Order Example (Stop-Loss)
An investor buys shares at $100 but wants to limit losses.
The investor places:
Sell stop order at $90
If the stock falls to $90:
The stop order activates
It becomes a market order
Shares sell at the next available market price
If the stock gaps below $90 overnight:
The actual execution price could be much lower than $90
Buy Stop Order Example
A stock trades at $50.
A trader believes a breakout above resistance could signal upward momentum.
The trader places:
Buy stop order at $55
If the stock rises to $55:
The stop order activates
It becomes a market buy order
Shares are purchased at the next available price
If the stock gaps higher rapidly:
The trader may pay more than $55
Stop-Limit Order Example
A stock trades at $100.
An investor places:
Stop price: $95
Limit price: $94
If the stock falls to $95:
The order activates
Shares will sell only at $94 or higher
If the stock gaps below $94:
The order may not execute
Price Gaps
A price gap occurs when a stock jumps sharply higher or lower between trading sessions without trading at intermediate prices. Gaps often occur due to earnings reports, economic announcements, analyst upgrades or downgrades, mergers, or unexpected news.
Gaps can significantly affect order execution:
Market orders may fill far from the expected price
Stop orders may trigger at unfavorable levels
Limit orders may not execute at all if the price jumps past them
Understanding gaps is essential because they can dramatically change trade outcomes, especially for traders who rely on stop‑based risk management.
Gap Example
Suppose a stock closes at:
$100
Overnight bad news causes the stock to open at:
$85
An investor with:
Stop order at $95
Will likely sell near $85 — not $95.
This demonstrates why stop orders do not guarantee execution price.
Stop‑Limit Orders
A stop‑limit order combines the conditional activation of a stop order with the price control of a limit order. It contains two prices:
A stop price that activates the order
A limit price that controls execution
Once triggered, the order becomes a limit order rather than a market order. This gives investors more control over execution price but introduces the risk of non‑execution. Stop‑limit orders are commonly used by experienced traders who want to avoid selling at extremely unfavorable prices during volatile conditions. However, if the stock moves too quickly, the order may remain unfilled, leaving the investor exposed to further losses.
Stop-Limit Example
A stock trades at $100.
An investor places:
Stop price: $95
Limit price: $94
If the stock falls to $95:
The order activates
Shares will sell only at $94 or higher
If the stock gaps below $94:
The order may not execute
Trailing Stop Orders
A trailing stop order automatically adjusts the stop price as a stock moves in a favorable direction. The stop “trails” the stock by a fixed dollar amount or percentage. Trailing stops are designed to protect profits while allowing gains to continue growing. Trailing stops are especially useful in trending markets, where investors want to stay in a position as long as momentum continues but still protect against sudden reversals. However, trailing stops can trigger prematurely if set too tightly, especially in volatile stocks where normal price fluctuations may activate the stop before the trend resumes. Finding the right trailing distance requires balancing risk tolerance, volatility, and time horizon.
Trailing Stop Example
An investor buys a stock at:
$100
The stock rises to:
$120
The investor places:
5% trailing stop
The stop price becomes:
$114
If the stock rises further to $130:
Stop adjusts upward to $123.50
If the stock later falls:
The stop remains fixed
Once hit, the order triggers
Order Duration Types
Order duration determines how long an order remains active.
Day Orders expire at the end of the trading session if not filled.
Good‑Til‑Canceled (GTC) orders remain active until executed or manually canceled, though brokers often impose time limits.
Immediate‑or‑Cancel (IOC) orders must execute immediately, even if only partially.
Fill‑or‑Kill (FOK) orders must execute in full immediately or not at all.
These duration types give investors flexibility in how they manage entries and exits, especially when dealing with large orders or fast‑moving markets.