Order Flow and the DOM

Course 36 of 60 in the futures hub. Displayed size can vanish before you trade it, and a $226 exit is awkward when the book shows 8 lots.

Depth That Can Vanish

Prices on the drawing step from 5124.00 down through 5123.75, 5123.50, 5123.25 and 5123.00 to 5122.75. Each step is a quarter point, the same 0.25 index tick used by ES and by MES. ES pays $12.50 for that tick. MES pays $1.25. You are looking at displayed size at one moment, and the drawing already says real books pull. Read the ladder as displayed inventory, not as a forecast.

Nothing forces a resting order to stay. People still chase a spoof print and call the print a setup. A thick offer is a quote someone can cancel, and hidden size can sit behind a small number you never agreed to.

1. What the DOM is

Prints are the tape: trades that already happened. The ladder is the other half, bids under the market and offers above it, each with a size that is willing to be seen. An iceberg shows a little and refills as it is hit. You won't know the hidden part in advance, and neither will I. Treat the number on the screen as the part someone chose to display.

Put your dollar cap, entry and stop into the futures contract size calculator before the ladder gets a vote. It turns the stop into ticks and a contract count, and ES and MES are both on its list. A dollar exit you already accepted doesn't move because the offer looks friendly. A chart of the last hour is silent on whether the book can absorb the order.

2. What it is not

Thin books, a stacked offer that keeps refreshing, and the gap between regular hours and the overnight session are the reads worth having. Throw out the stories: someone saying they have to buy, a spoof you then chase, a 2-lot stack on MES. Two MES contracts move 2 times $1.25, which is $2.50, on a single tick. That is the stack the drawing throws out.

If you need 50 lots of depth to exit $226 and the DOM shows 8, you are the size. Reduce.

Eight lots against the 50 you wanted is the whole comparison. The 50 is the depth you'd need to get out at your stop, with the loss held to $226, without moving the price yourself. The book printed 8. Your order is the size. Cut it until the displayed bids or offers can hold it, or accept that you are about to walk the price yourself. Regular hours usually show more size than the overnight session. Even then the size is a quote.

3. Icebergs and pull

Hidden size and a pull are opposite tricks, and both make the ladder a bad tape measure. An iceberg refills after you hit the displayed slice. A pull does the reverse: the bid or offer you were leaning on disappears as price gets close. Displayed size and the size that will actually trade are different numbers. You find out which one you had after the click, which is late.

When the bid pulls and price runs into your stop, the market did something ordinary. The stop was a price you already chose, in ticks, turned into dollars before the session. Don't add contracts because a stack looked thick a minute ago. Size stayed with the dollar cap. The ladder doesn't get to edit it mid-trade.

4. When it helps

Quiet regular-hours trade is where I still look. A thin offer tells you a modest buy can walk the price. A stack that refreshes says someone is willing to keep selling at that price, for as long as they leave the orders up. That is useful when the plan is to work an order and you need to know whether you are large next to what is displayed.

Staring at every pull will talk you out of a trade that was planned on an hourly chart. The tool has to match the clock you already wrote down. That clock, and the dollar cap, sit on the one-page futures plan. The stop is still a number of ticks.

5. When to ignore it

Fast news and a thin overnight book are when I ignore the ladder. Resting size gets cancelled in both, and what remains won't be there for the exit you practiced in your head. The drawing splits the day the same way: a quiet regular-hours session can help, and a news window or a thin overnight book will lie to you. Pay that lie often enough and the $226 exit doesn't get done at the price on the screen.

What the platform paints can change with the data feed. The tick doesn't. If the ladder and the CME contract spec disagree, believe the spec and your statement.

6. Mistakes, limits, takeaways

Spoof prints treated as a setup are the expensive habit. Close behind that is copying the size off a stream, then discovering their 8 lots were never your exit. A long vocabulary is another trap. Calling it order flow doesn't make the dollar cap optional. Stock books and perpetual books are different machines with different hours. Leave them out of this decision.

Several roots on one statement raise a different problem, once a single ladder is being read honestly. Long ES, long NQ and long crude can still be one bet. The lesson on ES, NQ and crude as one position does that count.

Resting orders can vanish before price gets there

From 5123.00 up to 5124.00 on that drawing is four quarter-point steps, because 5124.00 minus 5123.00 is 1.00 and 1.00 divided by 0.25 is 4. Four ES ticks are 4 times $12.50, so $50. Four MES ticks are 4 times $1.25, so $5. If the offers in between are cancelled, price can travel that gap on air. The size you were counting was never a floor.

Use the book for a short list of jobs: where it is thin, whether your order is large next to what is shown, and whether a big resting order got pulled as price came in. Then look away if the trade was planned on a slower chart.

What the book can and can't tell you

• The drawing's quarter-point steps are $12.50 a tick on ES and $1.25 a tick on MES.
• Needing 50 lots of depth to exit $226, with 8 lots shown, means you are the size.
• Two MES lots are $2.50 a tick. The drawing throws that stack out.
• Ignore the ladder into a news print and in a thin overnight book.
• From 5123.00 to 5124.00 is four ticks: $50 on ES, $5 on MES, if those offers pull.

If the ladder and the dollar cap disagree, trade the cap. Educational only. Not a recommendation to buy, sell, or hold any contract or pair.