Order Types Explained
Market, limit, stop, stop-limit. Choosing wrongly is how traders get fills far from where they intended, usually at the worst possible moment.
Every trade needs an order type, and the choice is a trade-off between certainty of execution and certainty of price. You can have one or the other, never both.
Market order
Execute immediately at the best available price. Guarantees execution, guarantees nothing about price.
Fine in liquid instruments during normal conditions. Genuinely dangerous in thin markets or around news, where the best available price can be far from the last quoted one. The gap between what you saw and what you got is slippage.
Limit order
Execute only at your specified price or better. Guarantees price, guarantees nothing about execution.
You may not be filled at all, and the fills you miss are disproportionately the ones where price ran without you. Limits are the right default for entries where you are not in a hurry.
Stop order
Becomes a market order once a trigger price is reached. Used to exit losers and to enter on breakouts.
The critical property: once triggered it is a market order, so it carries all of that order type's slippage risk. In a gap, a stop can fill far beyond its level. A stop is not a guarantee of your exit price.
Stop-limit order
Becomes a limit order once triggered. Protects against terrible fills but introduces a worse failure mode: in a fast move, price can jump past your limit and the order never fills, leaving you in a losing position with no protection.
A stop-limit on a protective exit can leave you holding exactly the position you meant to escape.
For risk exits, most experienced traders accept slippage over the possibility of no fill.
Trailing stop
Follows price at a fixed distance, locking in gains as a position moves favourably and never moving backwards. Useful for letting winners run without watching continuously.
The trade-off is that normal retracements trigger it. Set too tight and you exit healthy trends early; set wide and you give back a large share of gains.
Practical defaults
- Entering without urgency — limit order.
- Entering on a breakout — stop order, accepting slippage.
- Protective exit — stop order. Certainty of exit outweighs certainty of price.
- Taking profit — limit order.
- Around scheduled news — reduce size rather than relying on any order type to save you.
Educational content only. Not financial advice.
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