Unusual Volume in Stocks: What It Means and What to Do
Unusual volume means a stock is trading far more shares than normal for the time of day — often two times or more its average. It's a sign that something has changed: news, earnings, or big institutional buying or selling. Because volume reflects conviction, a price move on unusual volume carries far more weight than the same move on a quiet day.
What does unusual volume mean?
Unusual volume is best measured as relative volume (RVOL): today's trading volume compared with the stock's own average for the same point in the day. An RVOL of 1.0 is a normal day; 2.0 means twice the usual activity; 5.0 is a major event. Raw share counts can mislead — 10 million shares is huge for a small-cap and tiny for a mega-cap — so the ratio to a stock's own average is what matters.
Why does unusual volume happen?
- Earnings — results and guidance are the most common driver.
- News and catalysts — M&A, FDA decisions, product launches, lawsuits, management changes.
- Analyst actions — a major upgrade, downgrade or price-target change. See how to read upgrades and downgrades.
- Index or fund flows — being added to or removed from an index forces large trades.
- Technical breakouts — a move through a well-watched price level attracts momentum traders.
Is high volume bullish or bearish?
Volume itself is neither — it confirms whatever the price is doing. A stock rising on unusual volume shows real demand (bullish); a stock falling on unusual volume shows real selling pressure (bearish, often called distribution). The exception is a 'climax': an enormous volume spike after a long move can mark exhaustion and a turning point rather than a continuation. Context is everything.
How to use unusual volume in your research (step by step)
- Note the price direction on the spike — up on heavy volume is demand; down on heavy volume is supply.
- Find the catalyst — never trade a volume spike you can't explain.
- Use relative volume, not raw share count, so you're comparing the stock to its own normal.
- Pair it with the trend and the fundamentals or grade — volume confirms a story, it isn't the whole story.
- Avoid chasing late — by the time a spike is obvious, much of the move may be done; wait for a clean setup.
What is relative volume (RVOL)?
Relative volume is the ratio of current volume to the average over a lookback period (often 20 or 50 days), adjusted for the time of day. It's the cleanest single number for spotting 'unusual' activity because it normalizes for a stock's size and typical liquidity. Most scanners, including the Stocks Telegraph unusual-volume scanner, rank stocks by exactly this kind of relative measure.
How to find stocks with unusual volume
You can scan the market for today's unusual-volume names for free on the Stocks Telegraph unusual volume page, then open any ticker to check the catalyst, the trend and the ST Score before deciding whether the move is worth following.