Lesson 22 of 31 · Zero to reading a chart

Premarket Volume: One Number Worth Reading

Premarket dollar volume - each premarket minute's shares times its price, added up from 4:00 to 9:30 - tells you how many people have already shown up before the bell, and nothing about where the stock will go.

At nine twenty-nine in the morning, almost nothing about today is known yet. So what can you actually read before the bell?

One number. And it is not the price.

Two quick reminders. There is trading before nine thirty. It starts at four in the morning, with far fewer people in it.

And dollar volume is shares traded, times the price. The honest measure of how much money moved.

Put those two together, and you get premarket dollar volume. The money that changed hands before the market officially opened.

Here is why anyone bothers. Overnight, something happens to a company. By morning, a few people have read it and acted.

If almost no money traded on that news, almost nobody has reacted yet. If a lot of money traded, a lot of people already have.

That is all the number tells you. How many people already showed up.

Let us build it. This is one real morning, from four to nine thirty, and nothing after.

Each bar is one minute of premarket trading. Watch. Each bar's shares, times its price, go onto a running total.

Four o'clock. It starts fast. Fourteen million dollars in the first hour.

Five, six, seven. It slows right down. Eight o'clock, it moves again.

And at nine twenty-nine, we freeze it. Seventy-four million dollars. That is the number.

Now the same picture for a different morning. Same clock, same method.

Look at the two totals side by side. Seventy-four million, and just over one million.

Premarket dollar volume: the money traded from four to nine thirty, added up. You can read it before the day begins.

Here is the mistake, and it is worth saying clearly. A big premarket number does not mean the stock will go up.

It says nothing about the rest of the day. It tells you how many people have already arrived. Nothing about where they will go, or who else is coming.

One practical thing to know. Before nine thirty, an ordinary order does not trade. It sits and waits for the open.

Trading premarket needs a specific order type. That is about how orders work, not about whether your account is allowed.

Tomorrow, before nine thirty, look at any active stock. Ask: has anyone actually shown up yet?

Check yourself

Which hours does premarket dollar volume cover?

Four in the morning to nine thirty.

What two things are multiplied to build it?

Shares traded, and the price they traded at.

Does a large premarket number tell you what the stock will do?

No. Only how many people have already arrived.

Next lesson: why your order didn't fill.

For learning only. Not financial advice, not signals, not stock picks.