What Is Beta in Stocks? How the Beta Coefficient Shows Risk
Some stocks fall harder than the market, others fall less. The beta coefficient captures this in a single number. Here's how to read it and where its limits are.
What it is
Beta shows how strongly a stock has, on average, moved together with the market (usually an index) in the past. The market itself has a beta of 1.
| Beta | What it means | Example |
|---|---|---|
| Around 1 | Moves roughly like the market | Market −10% → stock about −10% |
| Less than 1 | Calmer than the market | Beta 0.5: market −10% → about −5% |
| Greater than 1 | Sharper than the market | Beta 2: market −10% → about −20% |
| Negative | Often moves against the market | Rare |
Where to find it and how to use it
Beta is shown by many screeners and company data websites (see the list in the article where to find company data). It's used to understand the character of a portfolio: if most of your holdings have a beta above 1, the drawdown will be deeper when the market falls.
Limitations
- Beta is based on the past. The company may have changed.
- It depends on the calculation period, so numbers differ from site to site.
- It doesn't show company-specific risk, such as a bad earnings report or debt.
- It's not a "good or bad" rating, only a description of how the stock moves.
Other metrics for evaluating a company are covered in the lesson valuation ratios and screeners.
Aspiro Invest — a medium-term portfolio: what to hold, when to review it, and where the protective levels are.
- Beta shows a stock's link to the market.
- Above 1 is sharper than the market, below 1 is calmer.
- It's based on the past and doesn't replace company analysis.
Frequently Asked Questions
What is considered a good beta?
There's no good or bad beta. A cautious investor may prefer stocks with a beta below 1; someone ready for big swings, above 1.
Why does the same stock have a different beta on different sites?
It's calculated over different periods and against different indexes. Compare beta within a single source.
Are beta and volatility the same thing?
No. Volatility is the size of the stock's own price swings. Beta is how closely those swings are linked to market moves.
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