Beta — What Is the Beta Coefficient?
Definition of beta coefficient in investing. How it measures market risk, how to interpret values, and what it means for your portfolio.
Definition
Beta coefficient (β) measures the sensitivity of a stock or portfolio price to market changes (benchmark, usually an index like S&P 500). In other words, beta tells you by what percentage an asset's price will change when the market changes by 1%.
Beta value interpretation
- β = 1.0 — asset moves identically with market
- β > 1.0 — asset is more volatile than market (e.g., β = 1.5 → market +10%, asset +15%)
- β < 1.0 — asset is less volatile than market (e.g., β = 0.5 → market +10%, asset +5%)
- β = 0 — no correlation with market
- β < 0 — asset moves opposite to market (rare)
Examples
| Company type | Typical beta |
|---|---|
| Technology companies | 1.2–1.8 |
| Utilities | 0.3–0.6 |
| Banks | 0.8–1.3 |
| Gold | ~0 (low correlation) |
| Government bonds | Negative or close to 0 |
Beta and portfolio risk
Beta measures systematic risk (market risk) — risk that cannot be eliminated through diversification. If your portfolio has beta 1.3, you can expect it to fall 13% when market falls 10%.
Defensive investors seek low-beta stocks. Aggressive investors seek high-beta stocks.
Beta limitations
- Beta is based on historical data — doesn't guarantee future behavior
- Changes over time (company's beta in bear market may differ from bull market)
- Doesn't account for company-specific risk (e.g., scandal, bankruptcy)
How Freenance can help?
Freenance can calculate your portfolio's beta relative to chosen benchmarks. Check if your portfolio is more or less risky than the market and adjust allocation to your goals.
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