Alpha
Investment return attributable to skill (stock selection, timing) rather than to broad market movement (beta). The core objective of active management.
Why Alpha matters in interviews
Alpha is the entire justification for active management fees, so hedge fund interviewers use it to test whether you understand that beating the market and taking more risk are different things. Any stock pitch implicitly claims alpha, and you should be able to say where it comes from.
How it works in practice
Alpha is the return generated in excess of what the fund's market exposure alone would predict. Under CAPM, alpha = actual return − [risk-free rate + beta x (market return − risk-free rate)].
A worked case: a fund returns 14% in a year when the market returns 10%, the risk-free rate is 4% and the fund's beta is 1.3. Expected return is 4% + 1.3 x 6% = 11.8%. Alpha is 14% − 11.8% = 2.2%. Most of the outperformance was simply leverage on market exposure, not skill.
This is why long/short funds report gross and net exposure alongside returns: it lets an allocator separate the part of the return that came from being in the market from the part that came from stock selection.
What candidates get wrong
- Confusing raw outperformance with alpha. A high-beta fund in a rising market outperforms without any skill.
- Failing to say where alpha comes from in a pitch. Credible sources are informational edge, analytical edge or behavioural/structural edge — and you should name which one you are claiming.
- Ignoring that alpha is measured against a chosen benchmark, so the choice of benchmark is itself contestable.
Alpha: frequently asked questions
What is the difference between alpha and beta?
Beta is the return you earn from exposure to the market and can be replicated cheaply with an index fund. Alpha is the return above what that exposure alone would produce, attributable to skill in selection or timing. Investors pay basis points for beta and performance fees for alpha, which is why distinguishing them matters commercially.
Where does alpha come from in a stock pitch?
From a specific, articulable edge: informational (you know something the market has not priced), analytical (you interpret the same public information better), or structural/behavioural (you can hold through a dislocation that forces others to sell). A pitch that cannot name which of these it relies on is asserting alpha rather than demonstrating it.
Go deeper
This term comes up constantly in hedge fund interviews and on the desk.
Hedge Fund interview prepRelated Hedge Fund terms
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