Market, limit and stop orders

An order is an instruction to a broker, and there are only three basic kinds. A market order says do it now. A limit order says do it at this price or better. A stop order says wait until the market reaches this level, then do it now.

Everything else on a trading platform - stop losses, take profits, pending entries, stop-limits - is one of those three pointed in a particular direction.

The trade-off, stated once

This is the whole subject. Every order type inherits one side of it, and no order type escapes it.

Where limit and stop orders sit

This is the part that confuses almost everyone at first, and it is entirely mechanical. A limit order is placed where the price is better than the current market. A stop order is placed where it is worse.

So a buy limit sits below the current price - you are waiting for it to come down to you. A buy stop sits above it - you are waiting for it to break upwards before joining in. Selling is the mirror image.

The four pending orders

With the market at $100. The direction you want and where you place the order together decide which of the four you are using.

The same two orders also appear as trade management: a sell stop below an open long is a stop loss, and a sell limit above it is a take profit.

The same order does two different jobs

A pending order placed when you are flat opens a position. The identical order attached to an open position closes it. Platforms present these differently and mechanically they are the same instruction.

That is why a stop-loss order behaves like a market order once triggered, with all the execution uncertainty that implies, while a take-profit order behaves like a limit order and can fill slightly better than asked. The difference in how those two orders treat you in a fast market is not an accident of design - it follows from what each one is.

Two strategies, two orders

A pullback trader thinks the market will come back to a level before continuing. They place a buy limit there and wait. If the pullback never arrives, nothing happens and nothing is lost.

A breakout trader thinks the market only becomes interesting once it clears a level. They place a buy stop just above it. They are deliberately paying a worse price than the current one in exchange for confirmation.

Both are reasonable and they are opposite bets about how price behaves. What matters is that the order type matches the idea: a breakout trader using a limit order will buy the failures and miss the breakouts.

Stop-limit: both halves, and both risks

A stop-limit adds a price boundary to a stop. Stop at $95, limit at $94, and once triggered the order will not fill below $94.

It sounds like the best of both and it is really the risks of both. You have protected yourself from a terrible fill by accepting the possibility of no fill at all - and if the market has gapped past your limit, the position you were trying to exit is still open and still falling.

Eighteen of the hundred brokers we rate list stop-limit among their order types. It is a specialist tool rather than a default, and it is a poor choice for the one job people are most tempted to use it for: getting out of a collapsing position.

Big orders are several fills

A large market order does not transact at one price. It consumes the available size at the best price, then the next, and your position opens at the weighted average of all of them.

This is the mechanism behind slippage, and it is why order size and market depth matter more as the position grows. A trade small enough to be filled at the top of the book behaves quite differently from one that eats through several levels of it.

When it matters most

In quiet conditions the choice between a market and a limit order is close to academic - the fill lands where you expected either way.

Around a scheduled announcement it is the most consequential decision on the ticket. Spreads widen, depth thins, and prices move between the click and the fill. A market order into that will execute; where, is genuinely unpredictable. A limit order will either get your price or nothing at all.

Neither is wrong. Choosing without knowing which one you picked is.

Questions people ask about order types