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  #1 (permalink)
New Zealand
Posts: 92 since Jun 2013
Thanks Given: 52
Thanks Received: 30

Hi guys,

I am trying to understand how many limit orders are filled on a one tick range bar on the es.

Also trying to understand how orders are matched.

By looking at the attached image, am I right in saying that 1 market order was matched with 1 limit order at 1629.25?

The data box shows Vol:1 for the far right 1 tick range bar in the image. Am I right in assuming that 1 limit order was traded for 1 market order and that 1629.25 is the last traded price?

Does this also mean 1 contract was traded? Or could it be 1 order for 5 contracts?

The red crosshair is just my cursor placement.


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  #3 (permalink)
Salt Lake City, UT
Experience: Intermediate
Platform: SC, NT, MT
Broker: AMP
Trading: NQ ES YM Bonds
Posts: 265 since Mar 2010
Thanks Given: 50
Thanks Received: 387

This is my perspective, others my have their view.

A tick chart shows trades. A trade can be for 1 or more contracts.

Volume is the number of contracts traded. If you have a 150 volume chart, one bar could be 150 trades, or it could be 1 trade, but the volume for that bar would be 150.

Do this to prove it to your self, create a 1 tick chart and add the Volume indicator. You will see that volume is not always 1

Now create a 150 volume chart and add the volume indicator. You will see the volume is always 150.

Keeping it simple, if a trade comes in to sell 5 contracts at price X, it must get filled with 5 contracts to buy at X. The system for the most part is FIFO, First In First Out processing. Market orders have precedence, when they hit the system they get filled at the market price - even before a limit order, causing/adding to the potential slippage of limit orders.

If a trade comes in for 5 contracts, the fill of this order could come from limit or a market orders, it just depends on the state of the queue at that given point in time.

I sure wish I could determine how it got filled as that may provide an edge. The closest I know how to get to that is looking at the Bid and Ask. With futures the spread is typically small between the bid and ask (typically 0, 1 or 2 ticks). Aggressive Buyers buy at the ask and aggressive Sellers sell at the bid - I am basing my measurement on the aggressor trader, the market order traders.

You can test this too, in simulation, during a slow time period, if you place a buy market order what price do you get filled at, bid or ask? Conversely if you issue a market sell order what do you get filled at?

What's even more weird, typically standing sell orders are above the ask, so the market moves upward looking for sellers - it either finds them or it does not. If it finds sellers the up movement does 1 of 2 things, goes sideways or goes down. But if there are no sellers to be found, price continues up. It's the law of supply and demand. Aggressive buyers is a low supply of sellers and the market moves to find the sellers. The market moves between points of equilibrium, seeking equilibrium.

Hope that helps

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Last Updated on July 9, 2013

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