Stock Volume

A chart tells you where a stock traded. Volume tells you how many shares traded during that period.

Suppose a stock moves from $10.00 to $10.20. That move could happen while 2,000 shares trade or while 200,000 shares trade. The price change is the same, but the amount of trading behind it is different.

That is why volume belongs beside the candles and levels you learned in Chart Reading. It adds a measure of activity to the price movement. To understand it, start with what a volume bar actually counts.

What A Volume Bar Counts

On a five-minute chart, each completed volume bar shows the shares traded during the matching five-minute candle. A daily volume bar shows the day's trading volume. Check the chart settings to see whether it includes premarket and after-hours trades as well as the regular session.

Imagine three trades during one interval: 100 shares, 250 shares and 150 shares. Together they contribute 500 shares of volume. Each transaction has a buyer and a seller; those shares are not counted twice simply because both sides participated.

Volume also does not tell you how many different people traded. The same shares can change hands repeatedly. A busy interval could involve many participants, repeated trading by fewer participants, or both.

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Read The Bar Beside Its Candle

A tall volume bar means more shares traded than in a shorter bar on the same scale. Look directly above it to see what price did during that activity.

Did price move through a marked level? Did it trade in a small range? Did it move higher and then finish back below resistance?

The same amount of volume can accompany a large price move or very little movement. Read the candle and its location on the chart to see what happened during that trading. Volume alone does not explain why price moved or stalled.

Many charts color volume bars according to whether the candle closed above or below its open, or whether price rose or fell from the previous close. Check how your chart assigns colors. A green bar does not count buyers, and a red bar does not count sellers. Every completed trade has both sides.

Compare Like With Like

Volume needs a reference point. A five-minute bar should first be compared with other five-minute bars, with attention to the session and time of day. Comparing it directly with a full day's volume mixes different periods.

The stock matters too. Fifty thousand shares in five minutes may be unusual for one stock and ordinary for another. A large opening bar may also reflect a different trading environment from a midday bar.

Start by asking whether activity increased or decreased within the chart you are reading. The next lesson, Relative Volume, explains how to make a more useful comparison with a stock's usual activity.

The Same Level, Different Outcomes

In this example, a five-minute chart has resistance near $10.20. The previous three completed volume bars each showed about 20,000 shares.

During the later test, 80,000 shares trade—four times the volume of a recent 20,000-share bar. Trading activity increases as price moves above resistance. Price then closes above the level in both that candle and the next one. High volume can also occur during breakouts that fail.

For comparison, imagine the same 80,000 shares trade as price moves above $10.20, but that candle closes at $10.17. The next closes at $10.12. Trading activity still increases, but price falls back below resistance.

Both examples have high volume during the resistance test. Their price outcomes differ. The candles show whether price holds above the level or falls back below it.

Quiet Trading And Fading Activity

When volume decreases while price trades in a narrowing range, fewer shares are changing hands as the price range tightens. Activity may pick up later, but the quiet period does not tell you when price will break out of the range or which way it will move.

After a large burst, smaller bars show that fewer shares are trading in those later intervals. Price may continue, pause or reverse. Look at the price response rather than assuming that declining volume forces a reversal.

For a swing trader, the same habit applies to daily bars: compare volume as price approaches or crosses a daily support or resistance area. Today's volume does not show how many shares will be available to buy or sell when the market opens tomorrow.

What Volume Leaves Unanswered

Volume measures completed trading. It does not show how many shares are currently available at a price for your next order, what spread you will face, or whether the quote will change before you fill. Those questions belong to liquidity and execution.

Try this question: a five-minute candle trades 100,000 shares but finishes back below resistance. What can you conclude?

The candle shows that 100,000 shares traded and price closed below resistance. To decide whether that volume was unusually high, compare it with other relevant five-minute periods. The bar does not identify the traders, explain their reasons, or predict the next candle.

When recording an example for later study, keep the timeframe, session and marked level with the screenshot. That preserves the context behind the volume reading.