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Measures how the stock is doing compared to overall stock market. A beta of 1.0 tells you that a stock has been going up and down with the overall stock market and is considered as volatile as the market. A stock with a beta between 0.0 and 1.0 has smaller ups and downs and may be less risky. A beta greater than 1.0 has wider price swings and may be riskier. Stocks with a negative beta are moving opposite to the stock market.