Volume

beginner

7 min read

Updated 2026-07-13

Reviewed by SST Editorial

Volume is the quantity of shares, contracts, or lots traded in an asset over a given time period. It is typically shown as vertical bars at the bottom of a chart. Volume measures the intensity of buying or selling interest: high volume indicates high participation and conviction, while low volume suggests lack of interest or consensus.

Key Takeaways

01.Represents the number of shares traded during a set timeframe.
02.Confirms trend strength: healthy trends show rising volume in the direction of the trend.
03.Confirms breakouts: a price breakout on low volume is highly likely to fail.
04.Extreme volume spikes can signal capitulation (bottoms) or buying climaxes (tops).

Why it matters

Volume is the fuel of price movement. It is the only indicator that reveals institutional participation. A breakout on 300% of average volume indicates major institutions are entering the stock, while a breakout on below-average volume is likely a retail-driven fakeout.

When it matters

It is critical in confirming support, resistance, breakouts, and trend structure across all markets.

📊

Visual Reference: diagram

Vertical bars at the bottom of the chart showing high bars on breakout days and low bars on consolidation days.

Interactive Tool: terminal-embed

Hover over the volume bars during a breakout to verify if the volume is above the 20-period average line.

Common Mistakes

Ignoring volume during breakout trades

Buying a stock breaking above resistance without looking at volume is a common pitfall. If volume is dry, the breakout is likely a trap and will quickly reverse.

📖 Real-World Example: Institution-backed breakout

A medical device manufacturer spent six weeks consolidating in a tight range. On a Tuesday, it broke above resistance on a 400% surge in volume. This massive participation confirmed institutional accumulation, leading to a sustained 3-month rally.

Command Palette