Orders and Execution · Futures Trading Guide
Displayed depth is a snapshot of available interest, not a commitment that will remain while an order travels to the exchange.
Read price and size together
An order book lists available bids and offers by price level. It helps estimate the immediate cost of consuming liquidity, but orders can be cancelled, replenished or matched before yours arrives. Hidden or implied interest may also affect execution. Depth does not reveal the beneficial owner or prove that a visible order expresses a lasting directional view.
Calculate a possible fill
Suppose the available offers are two contracts at 100 and three at 100.25. A five contract purchase consuming exactly that book would average 100.15. With a $20 multiplier, paying 0.15 above 100 across five contracts represents $15 of additional cost. This is a static illustration. Actual fills can differ as the book changes.
Separate trading hours from liquid hours
A contract may trade through much of the day while having uneven depth across sessions. Check maintenance breaks, local holidays and the session used for your chart. Around scheduled announcements, spreads can widen and prices can skip levels. A simulation using only bar closes cannot reconstruct the queue or guarantee that a stop would have traded at its trigger.
Define when execution is unacceptable
Set rules for maximum spread, minimum observable depth, rejected orders and data outages before placing a trade. Those are operational filters to test, not assurance that remaining trades will profit. If the strategy depends on fast reactions, measure data and order delays honestly. Practise cancelling and flattening positions through the broker’s supported backup process without assuming a chart disconnect also cancels exchange orders.
Try it yourself
An order book shows ten contracts at your desired price. Does that guarantee your order for ten will fill there?
Show the worked answer
No. The displayed interest can trade or disappear before your order arrives, and queue priority matters.
Further reading
Educational material. Prices, margins and strategy examples are hypothetical unless explicitly identified as contract specifications. They are not trade recommendations. Futures losses can exceed deposited collateral. Product terms and eligibility vary by venue and jurisdiction.
