Beta is a statistical indicator that measures how sensitive a stock's price is to overall market moves, using the S&P 500 as the reference (beta = 1.0).
How to read the number
- Beta below 1: the stock has historically moved less than the market. If the S&P 500 rises or falls 10%, this stock tends to move less than that in the same direction.
- Beta close to 1: it moves similarly to the overall market.
- Beta above 1: it moves more than the market, in both directions. A beta of 1.8 suggests that, historically, when the market rises or falls sharply, this stock tends to amplify that move.
More risk isn't the same as "worse"
A high beta isn't automatically bad: it means greater upside potential in bull markets, along with greater downside potential in bear markets. It's a risk/return characteristic, not a quality rating for the business. Companies in cyclical sectors (high-growth tech, commodities) tend to have higher betas; companies in defensive sectors (utilities, staples) tend to have lower ones.
Why it's useful to know before investing
Beta helps calibrate expectations for how much a position might move on a day of high overall market volatility, and helps you build a mix of stocks with different sensitivity levels depending on how much volatility you're willing to tolerate.
This article is educational content, not personalized investment advice. Before making decisions, read our disclaimer.