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What Is Stock Market Volatility?

Steven Levine, Founder of TickerPosts and OpenClassActions.com1 min readLast reviewed

Volatility describes how much a stock, fund, or market moves over time. A highly volatile stock can swing sharply in both directions. That movement can attract attention, but movement by itself is not the same thing as useful information.

Why volatility happens

Volatility can rise when investors disagree about value or when new information changes expectations. Earnings reports, regulatory decisions, interest-rate changes, product news, financing concerns, and social-media attention can all increase price movement.

Thinly traded stocks can also look more volatile because fewer shares trade. A relatively small order may move the displayed price more than it would in a highly liquid stock.

Volatility is not a recommendation

A stock that is moving a lot is not automatically better, worse, cheap, expensive, or ready for a reversal. It is simply moving. The useful question is why.

Ask:

  • Did new company information come out?
  • Is volume unusually high or low?
  • Are spreads wide?
  • Is the move tied to earnings, filings, or promotion?
  • Does the move change the long-term business case?

How to manage volatility

Volatility makes position size important. A position that feels small in a calm stock may feel too large in a stock that moves 10 percent in a day.

Before entering a volatile name, decide what would make you wrong, how much you can lose, and whether you are reacting to research or to a fast-moving chart.

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