What Actually Happens When Your Stop Hits the Market

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Understanding of Exchange Execution Dynamics

In futures trading, let’s understand how stops work before we discuss the details. First, we need to understand the difference between stop orders and limit orders.

Stop orders guarantee execution, not price.
Limit orders guarantee price or better, but not necessarily execution.

Now that you know the basic framework, let’s delve into stops specifically.

Let’s understand how a stop order goes from your computer to the exchange.

For example, you want to place a stop at 10,000 for whatever market you're trading. You're long one contract. Your stop at 10,000 goes to your broker.

If your broker is an FCM, they hold the stops with them. If it isn’t an FCM, they are an introducing broker (IB) who in turn deals with an FCM, which stands for Futures Commission Merchant.

The FCM handles margin, clearing, and risk management. They then route the order to the exchange and the clearing house. Usually this is executed via CME Group, and CME Clearing is the clearing house.

The exchange runs a central limit order book.

What that means is there is an order book with limit orders resting above or below the current price. Those limit orders are orders that can be matched with market orders. This is also known as liquidity.

For the sake of transparency, all trade participants deal with the same liquidity pool in that central limit order book. All the orders you see, everyone else sees.

With that being said, there is no need for brokers internalizing orders. That drifts into bucket shop territory.

The Depth of Market, also known as the DOM, displays all those resting limit orders, which as I stated earlier are passive liquidity waiting to be matched or filled.

Other advanced order types do not appear in the central limit order book.

Stops, Limits and Execution Logic

Now that we have that framework out of the way, let’s discuss stop and limit execution logic.

Your broker holds the stop on their side. So if you see that you placed a stop order in the depth of market and it is not in the order book, what you're seeing is that it has been sent to your broker.

The broker takes note that you're at that price.

When the market hits that price level — 10,000 — it triggers that stop order you placed. It becomes a market order and gets routed to the exchange and clearing house in the order it is received.

Since you're looking to sell, you're going to be matched against the limit orders below price, which are buy limit orders.

If sufficient liquidity exists, meaning there are bids at 10,000, you might get filled at 10,000. It just depends on when your order gets there.

When that 10,000 level is gone, it moves to 9,999, or whatever the next tick is for the contract you're trading.

In essence, the price matching engine goes through the order book between the price levels until the order size is matched.

So if there are 1,000 orders to sell, it goes through the book until it hits 1,000 limit orders.

Now if the liquidity is deep, meaning there are a lot of bids — maybe 10,000 buy limit orders within two or three points — you will hopefully get filled at 10,000, but maybe at worst 9,997, give or take.

Debunking Myths

With that understanding out of the way, you should also know something important.

Your stop is your agreement to trade with whoever takes the other side.

Basically, when your stop becomes a market order, you have agreed to trade with whatever limit order you are matched with in the order book.

So let’s get the myth out of the way about “stop hunting.”

This stop hunting myth is selective rage targeted at being stopped out at extreme levels.

Think about it.

You want to place a stop beyond a certain price, let's say the low of the day.

If you don’t understand market microstructure and how the order book works, then you really have no reason to complain.

If you don’t want your stop hit, look at the order book.

Is it thin?
Do you see the orders below it?
Are there bids ahead of you?

Meaning: are there deep clusters of orders ahead of your stop to defend your price?

It really depends.

Because limit orders do not represent the full intent of the market.

Just because you see a cluster of 5,000 limit orders above you, and you're sitting with your stop below the low of the day, it doesn’t mean you're safe.

Those 5,000 limit orders could be there to sell.

And that doesn’t account for another 10,000 participants that might jump in and sell at market the moment price hits that low — maybe two ticks above your stop.

Are you really safe?

That low of the day is a glaring point intraday. You're not the only one that sees it.

Millions of traders see it.

That's the illusion.

Rookie traders think placing stops beyond retracements or beyond the low of the day is some kind of hidden hiding spot — like a little cave.

In reality it’s more like a massive target.

There are participants who want to push price and accelerate movement. If you’re there, you're what we call collateral damage.

Sometimes price reverses.

Sometimes there is simply an order block that needed to get filled.

Maybe you were near the end of a block of 5,000 contracts getting filled. Maybe you were number 4,910 in that sequence.

Had you been later or further down in the order book, maybe you would have survived.

Who knows.

Disregarding Stop Runs

With that being said, if you want to trade professionally, disregard the idea of stop runs or the idea that the market is out to get you.

You placed the order there.

It was not an optimal position.

You got hit.

Those are the rules you abide by when you trade futures.

If someone cannot abide by those rules, then maybe they should not be a participant.

Intent and Liquidity

A few more notes to bring this home.

When you look at the order book, if you have full market depth, you usually see around 100 ticks above and below price, depending on the instrument.

You can see if the book is deep or thin.

You can see where liquidity is.

But you cannot see intent.

You can only anticipate.

For example, maybe you see normal levels like:

200
500
300
200
100

for about ten points.

Then suddenly you see a large block of 3,000.

What you should think is:

That is a pool of liquidity.

A lot of limit orders will get matched there, whether they are selling or buying.

If you want to exit a trade, that’s often where you want to be because there will be a lot of trading activity.

Those deep pools of liquidity in the central limit order book help minimize slippage.

You have to think in these higher-level ways.

Very strategically.

The Variance of Discretion vs. Systematic Trading

Now the inverse is also true.

If there are gaps in the order book, the book is thin.

You are probably not going to get the fill you want.

If you are not already resting in the queue, or if you placed your order late with your broker, the later you place your order the higher the chance of slippage.

Think about it like standing in line buying lunch.

If you arrive late at a high-demand restaurant that only produces a limited amount every day, there is a high chance you might be out of luck.

You might be SOL.

Another observation from experience:

Discretionary traders often do not model slippage or transaction costs when trading. They act like those things don’t exist.

They just want to trade for the thrill, the excitement, the participation, or whatever their motive is.

It is different for systematic traders.

Most systematic traders model slippage and transaction costs directly into their systems.

In Closing

With that being said, I hope you enjoyed this rundown on how stops really work in futures markets.

The concepts here were based heavily on CME Group, NYMEX, and COMEX, but the principles apply almost everywhere — whether you are trading on ICE or other exchanges worldwide.

Until then,

Trade well.

Lastly

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~Asymmetric_Vol