Some stocks barely move when the market swings; others jump or plunge far more than the market does. Beta is the number that captures this. It's shown in the key statistics on every StockEngine stock page.
What beta means
Beta measures how much a stock has historically moved relative to a benchmark, usually the S&P 500, which has a beta of 1.0 by definition.
- Beta of 1.0: tends to move in line with the market.
- Beta above 1: more volatile. A beta of 1.5 suggests the stock has typically moved about 50% more than the market: up 15% when the market rises 10%, and down 15% when it falls 10%.
- Beta between 0 and 1: less volatile than the market.
- Negative beta: tends to move opposite to the market. Rare among stocks.
Beta is usually calculated from several years of monthly or weekly returns, so different data providers can show slightly different numbers.
High-beta vs. low-beta stocks
High-beta stocks are often fast-growing companies, smaller companies and businesses tied closely to the economy, such as technology, travel or materials. They can rise sharply in bull markets and fall hard in bear markets.
Low-beta stocks are often utilities, consumer staples and health care companies whose sales hold up in recessions. They tend to cushion a portfolio during downturns, but may lag in strong rallies.
What beta doesn't tell you
- It looks backward. A company that changes its business or takes on debt can become much riskier than its past beta suggests.
- It ignores company-specific risk. A stock can have a low beta and still collapse on bad news, such as a failed product or an accounting problem.
- It measures volatility, not quality. A low beta doesn't make a stock a good investment, and a high beta doesn't make it a bad one.
Using beta in practice
- Filter by beta in the stock screener to find calmer or more aggressive stocks.
- Balance high- and low-beta holdings to control how much your portfolio swings. See how to diversify.
- Use smaller positions for high-beta stocks. The position size calculator sizes trades by the risk you're willing to take.
This article is educational and not investment advice.
StockEngine articles are for education only and are not investment advice. Some links may be affiliate links.