- Glossary
- Alpha
Alpha

Key Highlights
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Alpha measures the difference between the expected return on a portfolio, based on its level of risk as measured by beta, and the actual return the investor has achieved.
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A positive alpha value indicates that a portfolio has outperformed its benchmark index; conversely, a negative alpha reflects underperformance relative to the benchmark.
What is Alpha?
Alpha in stocks is a measure used by investors to assess the performance of their portfolios relative to the market. Alpha measures the difference between the expected return on a portfolio, based on its level of risk as measured by beta, and the actual return the investor has achieved.
What does Positive and Negative Alpha Mean?
A positive alpha value indicates that a portfolio has outperformed its benchmark index; conversely, a negative alpha reflects underperformance relative to the benchmark.
Importance of Alpha
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Alpha is one of the most important tools used by investors when constructing and managing portfolios.
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High levels of alpha can be indicative of active managing skills, while low alpha values suggest that passive management techniques are being employed.
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Alpha also helps investors judge how much risk they will have to take in order to achieve certain returns.
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As such, it is an extremely useful tool for determining which investments to make and when.