Funds Management • Risk-Adjusted Metrics & Alpha • Intermediate Level

Alpha (α)

Definition: The gauge of an investment strategy's excess performance relative to the expected return of a benchmark index.

Comprehensive Institutional Breakdown

Alpha represents the value that a portfolio manager adds or subtracts relative to market risk. A positive alpha of +3.0 indicates the fund outperformed its CAPM risk-adjusted benchmark by 3% annually. Zero alpha indicates the strategy perfectly mirrored benchmark performance.

Algorithmic Formula / Notation
α = R_portfolio - [R_free + β × (R_market - R_free)]
Institutional Scenario Example
If the market returned 10% and a fund with beta 1.0 returned 13%, the manager generated +3.0% pure alpha.
Cross-Market & Execution Note
In active trading, alpha stems from auction market liquidity timing and asymmetric execution.