1. UK: One of the four classifications (with beta, gamma, and delta) of the largest and most traded stocks on London Stock Exchange (LSE) under the 'normal market size' classification system.
2. US: Measure of price volatility of a stock (shares). Alpha methodology tries to separate the price movements of a particular stock from those of the stockmarket, and focuses on fundamentals such as the growth rate of stock's earnings per share (EPS). A high alpha score means the stock is expected to remain stable no matter how the stockmarket behaves. See also beta.