What Does Alpha Mean in Investing?

By Lee Samaha – Updated Feb 25, 2025 at 11:35 PM EST

Key Points

Alpha measures if a manager's skill, not luck, adds investment value beyond market returns.
Understanding alpha helps investors avoid paying for market risk (beta) that can be managed independently.
Alpha calculation adjusts a portfolio's return by risk-free rate and market risk, revealing true skills.

Alpha is a concept most commonly used in the mutual and hedge fund industry to measure the skill of an active investment manager in generating returns over and above market benchmarks. By measuring the alpha generated by an investment manager, investors can make informed decisions about whether the manager was just lucky to generate returns or whether they got there by taking on risk. Ultimately, measuring alpha can help you decide whether the manager's active management adds value.

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Measuring alpha. — Image source: Getty Images.

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About the Author

Lee Samaha is a contributing Stock Market Analyst at The Motley Fool covering industrials, electricals, energy, materials, transportation, and infrastructure stocks. Prior to The Motley Fool, Lee was a Civil Engineer and Investment Manager. He holds a Bachelor of Civil and Structural Engineering from Southampton University and a Certificate in Investment Management from Chartered Institute for Securities & Investment. Lee first cut his investing teeth on The Motley Fool bulletin boards (commonly referred to as the “Fool Boards,”) and he’s infinitely grateful to all of the investors he learned from in this powerful investing community.

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Lee Samaha has no position in any of the stocks mentioned. The Motley Fool has positions in and recommends Intel. The Motley Fool recommends the following options: short February 2025 $27 calls on Intel. The Motley Fool has a disclosure policy.