Price moves are easy to fake — volume is not. A guide to reading On-Balance Volume, accumulation days, and the signature of institutional buying.
Price tells you what happened; volume tells you whether to believe it. A breakout on thin volume is suspect. A breakout on heavy volume — especially after a quiet base — is the market voting with real money. Learning to read volume is one of the most underrated skills in trading.
The concept of accumulation
Accumulation is the process of large buyers quietly building a position. It shows up as rising volume on up days and shrinking volume on pullbacks — demand outweighing supply. On-Balance Volume (OBV), which adds volume on up days and subtracts it on down days, is a simple way to visualise whether money is flowing in or out.
Confirming a breakout
When a stock finally clears resistance, you want to see a surge in volume — ideally well above its average. That confirms institutional participation rather than a low-conviction fake-out. A breakout that fails to attract volume often gets sold back into the base.
The bottom line
You can paint a chart with price, but you cannot fake sustained volume. Pair volume analysis with a clean base and a catalyst, and you have a far higher-probability breakout than price alone will ever give you.
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