What You'll Learn
- The exact dollar difference between market and limit orders on a real trade
- How slippage works and when it costs real money
- Which order type to use for liquid stocks vs small caps vs options
- What happens with each order type in volatile markets
- Additional order types: stop, stop-limit, and trailing stop
Buying Apple at $185: Market Order vs. Limit Order
Market order: filled instantly at $185.12. Limit order: filled at exactly $185.00 — or not at all. That $0.12 difference is $12 on 100 shares. Over 100 trades, that's $1,200.
You want to buy 100 shares of Apple (AAPL) at $185. Let us run both order types side by side.
Market order: You place a market buy order. Apple's bid is $184.99, ask is $185.12 (slightly wider than usual — maybe it is 9:35 AM, just after market open). Your order fills at the ask: $185.12 per share. Total cost: $18,512. You paid $12 more than expected. On 100 shares, that is a real number.
Limit order at $185.00: You place a limit buy at $185.00. Your order goes into the order book and waits. If Apple's price dips to $185.00 or below, you get filled at exactly $185.00. Total cost: $18,500. If Apple never drops to $185.00 and instead climbs to $190, your order expires unfilled. You own zero shares.
The difference: $12 on a $18,500 trade — 0.06%. For this particular trade, the market order's slippage is modest. But the math changes dramatically depending on the stock and conditions.
The visual below shows the core tradeoff — speed versus price control — for both order types.
The Core Tradeoff
Market orders guarantee your trade executes but not the price. Limit orders guarantee the price but not that the trade executes. Neither is inherently "safer" — it depends on the situation.
When Each Order Type Matters: Scenario Comparison
The $12 slippage on 100 shares of Apple is manageable. But what happens in other situations? This table shows how the same order types behave across different scenarios — and where the stakes get real.
The Simple Rule
For Apple and Microsoft, market orders are fine. For small stocks and options, always use limit orders. The spread is your guide — if it is a penny, market orders cost nothing. If it is a dollar, limit orders save real money.
| Scenario | Market Order Result | Limit Order Result | Recommended |
|---|---|---|---|
| Liquid stock (Apple, $185, 1-cent spread) | Fills at $185.01. Slippage: $1 on 100 shares. | Fills at $185.00 or waits. Risk: missing the trade. | Market order — slippage is negligible |
| Small-cap stock ($32, $1.00 spread) | Fills at $32.50 (the ask). Overpays $50 on 100 shares. | Fills at $32.00 or waits. Saves $50 if filled. | Limit order — the spread is too wide |
| Volatile market (earnings day, $185 stock swinging $90-$95) | Could fill anywhere from $90-$95. No control. | Fills at your price or not at all. Predictable. | Limit order — volatility creates slippage |
| Options contract ($3.50 bid, $3.80 ask) | Fills at $3.80. Overpays $30 per contract (x100 multiplier). | Fills at $3.65 or waits. Saves $15+ per contract. | Always limit orders for options |
| After-hours trading ($150 stock, $148-$153 spread) | Fills at $153. Overpays $300 on 100 shares. | Fills at $150 or waits. Much safer. | Limit order — after-hours spreads are wide |
| Large order (10,000 shares of mid-cap) | May move the price as it fills across multiple levels. | Fills at target or waits. Prevents market impact. | Limit order — large orders need price control |
Try It Yourself
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How Market Orders Work
A market order tells your brokerage: buy (or sell) this stock right now at whatever the best available price is.
When you place a market buy, the brokerage matches your order with the lowest-priced sell order currently available — the ask price. This happens in milliseconds for actively traded stocks. Your order fills almost instantly, and you own the shares.
The price you pay might differ slightly from the displayed price. This difference is slippage — the gap between the expected price and the actual fill price.
For stocks like Apple (50+ million shares traded daily), slippage on a small order is typically one cent or less. For thinly traded stocks, slippage can be $0.50 or more per share.
Slippage gets worse in specific conditions: market open (9:30-10:00 AM), when spreads are wider; major news events, when prices swing rapidly; low-volume stocks, where few shares are available at each price level; and after-hours trading, where participation is thin.
The advantage of market orders is certainty of execution. During market hours, your order fills. Period. This matters when you have decided to act and speed is more important than saving a few cents per share.
How Limit Orders Work
A limit order tells your brokerage: buy this stock only if the price is at or below my limit price (for buys), or sell only if the price is at or above my limit (for sells).
Buy limit example: Apple is at $185. You place a limit buy at $183. Your order enters the order book and waits. If Apple drops to $183, your order fills — possibly at $182.95 if that is the best available price. "Or better" is the key phrase. You never pay more than $183, but you might pay less.
Sell limit example: You own Apple at a $185 cost basis. You place a limit sell at $195. If Apple reaches $195, your shares sell — possibly at $195.05. You never receive less than $195.
Limit orders have a duration setting. A day order expires at 4:00 PM if unfilled.
A GTC (Good 'Til Canceled) order stays active for 60-90 days (varies by brokerage). A common beginner mistake: setting a GTC limit order and forgetting about it.
Three weeks later, the stock hits your limit and the order fills — by which point you may have changed your mind.
The advantage of limit orders is price certainty. The disadvantage is execution uncertainty. If you set a buy limit at $183 and Apple never drops below $184, you own zero shares while the stock climbs to $200.
Side-by-Side: Every Key Difference
Here is a comprehensive comparison across every dimension that matters when choosing between market and limit orders.
| Feature | Market Order | Limit Order |
|---|---|---|
| Execution speed | Immediate (during market hours) | Only when limit price is reached |
| Price guarantee | No — best available price | Yes — your price or better |
| Fill guarantee | Yes (during market hours) | No — may never fill |
| Slippage risk | Possible, especially in volatile/illiquid markets | None — price is controlled |
| Decision required | Quantity only | Quantity + limit price |
| Order duration | Day order (default) | Day or GTC (your choice) |
| After-hours use | Often restricted | Typically required for extended hours |
| Partial fills | Possible, filled quickly | Possible, may remain partially open |
Beyond Market and Limit: Stop and Stop-Limit Orders
Market and limit orders handle most situations. But three additional order types build on these foundations.
Stop order (stop-loss): Triggers a market order when the stock reaches a specified price. Common use: you bought Apple at $185 and place a stop at $170. If Apple drops to $170, a market sell order fires automatically. Warning: in a fast-dropping market, the fill price may be below $170 due to slippage.
Stop-limit order: Triggers a limit order (not market) when the stop price is reached. Same example: stop at $170, limit at $168. If Apple drops to $170, a limit sell at $168 activates. You will not sell below $168 — but if the price crashes through $168 before your order fills, you are stuck holding.
Trailing stop: A stop price that moves up as the stock rises. Set a trailing stop at $10 below the current price. If Apple goes from $185 to $200, the stop moves from $175 to $190. If Apple then drops from $200 to $190, the stop triggers. It locks in gains as the stock rises.
| Order Type | Trigger | Executes As | Primary Use |
|---|---|---|---|
| Stop order | Stock reaches stop price | Market order | Limiting losses |
| Stop-limit order | Stock reaches stop price | Limit order | Controlled loss limiting |
| Trailing stop | Stock falls by set amount from peak | Market order | Protecting gains |
Key Considerations for Choosing Your Order Type
Here is how experienced investors typically think about the decision.
Check the spread first. Before choosing an order type, look at the bid-ask spread. One cent? Market order is fine. Fifty cents or more? Use a limit order. The spread is the best predictor of how much slippage you will experience.
Time of day matters. Spreads are widest at market open (9:30-10:00 AM) and narrowest in the middle of the day. Many investors avoid market orders in the first 15 minutes of trading.
Volatility changes the calculus. On a normal day, Apple's spread is one cent. During an earnings release, it can widen to $0.10 or more. Check conditions before choosing.
Options always need limit orders. Options have wider spreads than stocks, and the 100-share multiplier means every penny of slippage costs $1 per contract. There is no scenario where a market order on options makes sense.
Pro tip for beginners: If you want the speed of a market order with price protection, place a limit order at the current ask price. It fills immediately (like a market order) but caps your cost (like a limit order). You get the best of both worlds.
Continue Your Learning
You now understand when market orders and limit orders matter — and more importantly, when the difference between them is negligible. Here are resources to keep building.
Related guides:
- How to Buy Stocks — Complete walkthrough of the stock purchasing process
- How to Start Investing — Broader guide covering all aspects of getting started
- What Is a Brokerage Account? — Understanding the account you need to place orders
- What Is Paper Trading? — Practice placing different order types without real money
Foundational concepts:
- What Is a Stock? — Understanding what you are buying or selling
- What Is an ETF? — ETFs use the same order types as stocks
- What Is the S&P 500? — Context for index investing
StockCram courses:
- Order Types — Comprehensive lesson covering all order types in depth
- Your First Stock — Putting order type knowledge into practice
- Risk Management — How order types fit into risk management
Practice recommendation: Before using real money, practice with paper trading. Place market orders and limit orders on different stocks. Notice how execution prices compare to quoted prices, and observe what happens when limit orders sit unfilled.
Related Guides
Continue Your Learning
Related Terms
Key Takeaways
Market orders: speed, no price guarantee
A market order fills in seconds but you accept whatever the current price is. On Apple, that is $0.01-0.02 slippage. On a small cap, it could be $0.50-$1.00.
Limit orders: price control, no fill guarantee
A limit order at $185.00 means you pay $185.00 or less — period. But if the stock moves to $190, your order sits unfilled. You missed the trade.
For Apple and Microsoft, market orders are fine
Stocks that trade 50+ million shares daily have one-cent spreads. Slippage on small orders is pennies. The speed advantage outweighs the cost.
For small stocks and options, always use limit orders
Wide spreads ($0.50-$2.00+) mean market orders can cost significantly more than expected. Limit orders prevent overpaying.
Frequently Asked Questions
It depends on the stock. For heavily traded stocks like Apple and Microsoft (one-cent spreads), market orders are simple and safe — slippage is pennies. For small-cap stocks, options, or volatile markets, limit orders are safer because they prevent overpaying. A good beginner strategy: use a limit order set at the current ask price. You get instant execution with price protection.
Yes. A buy limit at $185.00 could fill at $184.90 if that is the best available price when your order reaches the exchange. The limit price is the ceiling (for buys) or floor (for sells), not the exact execution price. You always get your price or better — never worse.
The order queues and executes when the market opens the next trading day. Because prices can change significantly overnight (earnings, news, global events), the opening price may differ substantially from the previous close. Many investors use limit orders for orders placed outside market hours to avoid surprises.
Slippage is the difference between the expected price and the actual fill price. For liquid stocks (Apple, Microsoft), slippage is typically $0.01-0.02 per share — negligible. For small-cap stocks with wide spreads, slippage can be $0.50-$1.00+ per share. On 100 shares of a small cap with $0.75 slippage, that is $75 — real money.
Always limit orders for options. Options have wider bid-ask spreads than stocks, and the 100-share multiplier means every cent of slippage costs $1 per contract. A market order on an option with a $0.30 spread costs $30 per contract in slippage. There is no scenario where market orders make sense for options.
No. At most major brokerages, stock and ETF trades are commission-free regardless of order type. The real cost difference is implicit: market orders accept the current spread (an indirect cost), while limit orders can potentially achieve better pricing. The order type itself does not affect the commission.
Sources & References
- U.S. Securities and Exchange Commission — Trade Execution
- https://www.investor.gov/introduction-investing/investing-basics/how-stock-markets-work/types-orders
- FINRA — Understanding Order Types
- NYSE — Order Types