Trading volume is the total number of shares of a stock that are bought and sold over a given period, such as a day, and it is a key indicator of a stock's liquidity and the level of investor interest in it.
Trading volume counts activity. If 200,000 shares of a company change hands during a trading day, its daily volume is 200,000 shares. Average daily volume, measured over weeks or months, smooths out day-to-day swings and gives a clearer picture of how actively a stock trades.
Volume matters for two main reasons. First, it is the clearest indicator of liquidity. A stock with high, consistent volume can be bought and sold easily without moving the price much, while a low-volume stock is harder to trade and more prone to sharp price moves on modest orders. Second, volume reflects interest. Rising volume, especially alongside news or results, signals that more investors are paying attention and acting, whereas persistently low volume often indicates a stock that is under-followed.
For small and micro-cap companies, volume is frequently a limiting factor. Thin trading can deter institutional investors, who need to enter and exit positions without disrupting the market, and it can make a stock feel neglected even when the underlying business is sound. Low volume and low visibility tend to reinforce each other.
A company cannot dictate its trading volume, but healthy volume tends to follow from a broad, engaged shareholder base. As more investors understand a company and choose to trade it, volume and liquidity improve together, which in turn makes the stock accessible to a wider set of investors.