What is referred to when a portfolio's movement exceeds the expected beta?

When a portfolio's movement exceeds the expected beta, it is referred to as Portfolio Alpha. Alpha is a measure of the performance of an investment or portfolio compared to a benchmark index, after adjusting for risk, commonly represented by beta. Specifically, if a portfolio has a positive alpha, it suggests that the portfolio has outperformed its expected returns based on its level of systemic risk (beta). This means the portfolio manager has generated excess returns, indicating effective management or successful investment choices beyond what would be expected from market movements alone.

Portfolio beta, on the other hand, measures the sensitivity of a portfolio's returns to market returns, providing insight into the expected volatility in relation to the broader market. While risk, variance, or any other mentioned terms may pertain to portfolio analysis, they do not specifically capture the concept of exceeding expected performance as alpha does.