Order Types Explained: Market, Limit, Stop
An order type is the instruction that tells a broker how to trade, not whether to. A market order takes whatever price is available and always fills; a limit order names a price and fills only if the market reaches it, which means it can be missed entirely.
How it works
An order type is an instruction about how to trade, never about whether to. The decision is yours. The order type only decides what the broker is permitted to accept on your behalf.
A market order says: fill me now, at whatever the best available price is. It is a certainty about execution and an open question about price, because a market order that reaches a functioning market always fills.
A limit order says: fill me at this price or better, and not otherwise. It is a certainty about price and an open question about execution. If the market never comes to your number, nothing happens and you own nothing.
That trade-off is the whole subject, and it is measurable rather than a matter of taste.
The fill-rate trade-off, worked through
Take a hypothetical share at $50 and a buy limit resting at $49.50, good for five days. It fills only if price trades down to $49.50 at some point in those five days. If it never does, the order expires and you own nothing.
Now ask which trades it missed. A miss means price stayed above $49.50 the whole time, so every missed order is, by construction, one where the market never offered the dip — and a good share of those are days when it rose instead. Move the limit to $49 and the price improves by another 50 cents while fewer days reach it.
That is the part nobody mentions. The trades a patient limit order misses are disproportionately the ones that ran without you.
A stop order is the third type and it is the one most often misunderstood. A stop is a trigger. When price touches it, a market order is sent. The stop price is where the order wakes up, not where it fills.
In practice: stops, gaps and duration
On the gaps above, a stop sitting inside the gap does not fill inside it. The market opens past the trigger, the stop converts to a market order, and it is filled at the open. The distance between those two numbers is the cost of the gap, and no order type removes it.
A stop-limit is the compromise and it cuts both ways. It triggers like a stop and then behaves like a limit, so it refuses a bad fill — and on a genuine gap it refuses every fill, leaving you in a position you had decided to exit.
Underneath all of this is one queue. A limit order rests in the order book and waits its turn. A market order removes resting orders. That is the whole mechanism, and every order type is a different way of interacting with it.
Duration is the setting people forget. A day order expires at the close; a good-till-canceled order does not. An order left resting for weeks will eventually fill on a day when the reason you placed it no longer applies.
Two more duration settings exist and both are narrow tools. Fill-or-kill demands the entire quantity immediately or cancels; immediate-or-cancel takes whatever is available right now and cancels the remainder. Both matter only when your size is large enough that partial fills are a real possibility, which for most retail orders they are not.
A trailing stop is a stop whose trigger moves. You set a distance rather than a price, and the trigger follows the position’s favorable direction while never moving back. It converts a fixed exit into a ratchet, and it is still a market order once it fires — so everything said about gaps applies to it unchanged.
Market-on-close and limit-on-close route into the closing auction rather than the continuous session. That auction is a single price struck once, with far more size behind it than an ordinary moment in the day, which is why large orders often prefer it.
When it fails
A limit order’s fill rate is not a property of the order — it is a property of the market. In the range above, price returns constantly and almost everything fills. In a trend it does not, which is exactly when you most wanted to be on.
And the spread is charged regardless. Choosing a limit order does not avoid it; it just changes which side of it you are standing on. A market order crosses it and pays immediately. A resting limit order is on the receiving side of the next person who crosses.
The third failure is a limit order that fills for the wrong reason. A buy limit resting well below the market fills when something has gone wrong badly enough to reach it. The order did exactly what it was told, and the reason it filled is a reason you might not have chosen to buy.
The original data
Of the 24,971 trading and investing videos measured for this site, 9 have “order types” in the title, from 8 channels, at a median of 39,153 views.
The question: You want in. Market now, or limit and risk the miss?
The honest summary of that example is that there is no free choice in it. Every step toward a better price costs fill rate, and the orders you lose are weighted toward the moves you wanted.
Related
The order book is the queue every one of these joins. The bid-ask spread is what a market order pays to cross. And a stop-loss is an order type with a job attached, which is why its placement is a separate question from its mechanics.
I use limit orders for entries and market orders for exits, and that asymmetry is deliberate. Missing an entry costs you a trade you might not have wanted; missing an exit costs you the one thing you were certain about, which was that you wanted out.
— Michael Whitman
This page is educational, not financial advice. Test every idea on your own charts before risking money.