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Why Do Stock Prices Move?

The Stock Market for Beginners • Beginner Investing • 6 min

What this lesson is about

A stock's price changes every day for real reasons, some about the company itself, some about the whole economy, and some about pure human psychology.

2 parts · a quick check after each · then the quiz

Part 1 of 2

At its core, a stock's price shifts due to one main reason: the balance between buy orders and sell orders changes. If more people want to buy than sell at the current price, it drives the price up until a new balance is reached. Conversely, if more people want to sell than buy, the price drops. The real question is what causes that balance to shift in the first place. It’s rarely just one factor.

Company-specific news can move individual stocks. Think about quarterly earnings that beat or miss analyst expectations, a new product launch, a lawsuit, or a CEO change. Then there's macroeconomic news, which affects nearly every stock at once. Events like a Federal Reserve interest rate decision, an inflation report, or a jobs report can have a big impact. Don’t forget market sentiment. The overall mood of investors, often summed up as "fear and greed," can shift prices even without any real change in a company's business.

Quick check

In the shortest term, what directly determines a stock's price?

Part 2 of 2

Insider Angle: Benjamin Graham, often called the father of value investing and a mentor to Warren Buffett, had a famous way of looking at this: in the short run, the market acts like a voting machine that reflects popularity and sentiment. In the long run, it behaves like a weighing machine that reflects a company's true, measurable value. That's why a stock can swing several percent in a single day based on rumor or mood, while a company with steadily growing profits over 10 years usually sees its stock price rise accordingly. Both the short-term noise and long-term signal are real; they just work on different timelines.
Try This: Choose a stock and check its price chart for the last 30 days. Identify the biggest one-day move, whether up or down, and find out what specific news, if any, was released that day that might explain the change.
Reading a stock chartThe average is the trend with the noise taken out, nothing more.

Quick check

Which of these is a "company-specific" reason a stock's price might move, as opposed to a broad market-wide reason?

Quiz

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