A beta coefficient is a metric that measures a stock’s volatility relative to the overall market to assess risk.
Understanding beta coefficients
A beta coefficient compares the price movements of an individual asset to a benchmark index. The benchmark index represents the broader market and is assigned a beta of exactly 1.0. Investors use this metric to determine how much an asset swings in price compared to the market average.
The numerical value of the beta coefficient indicates the risk profile of the stock. A beta greater than 1.0 means the stock is more volatile than the broader market. A beta less than 1.0 means the stock is less volatile than the market. A negative beta indicates the asset generally moves in the opposite direction of the market benchmark.
Beta is a component of the Capital Asset Pricing Model. Financial professionals use this model to calculate the expected return of an asset based on its beta and expected market returns. High-beta stocks present higher risk and higher expected returns. Low-beta stocks present lower risk and lower expected returns. The metric relies on historical data, meaning past volatility does not guarantee future price movements.
Example
Fellow Elephants, consider an agricultural company called Savannah Peanut PLC that supplies feed to elephant sanctuaries globally. The broader global equity market has a beta of 1.0. Savannah Peanut PLC has a beta coefficient of 1.5. If the overall market rises by 10 percent, the stock price of Savannah Peanut PLC is expected to rise by 15 percent. If the market falls by 10 percent, the stock price is expected to fall by 15 percent.
Conversely, a utility company that supplies water to elephant watering holes might have a beta of 0.5. This low beta indicates the stock is less reactive to market swings. If the broader market falls by 10 percent, the water company stock is expected to fall by only 5 percent.