abnormal stock return refers to the difference between the actual returns of a stock and the expected returns based on its risk profile or market performance. It is a key concept in finance used to assess how a specific event, news, or market change affects a stock’s performance beyond what is typically anticipated.
This measure is relevant for investors and analysts who aim to understand how certain events, such as earnings announcements, mergers, or economic indicators, can lead to unscheduled gains or losses. By isolating abnormal returns, stakeholders can evaluate the effectiveness of management decisions, market efficiency, and investor sentiment.
Calculating abnormal returns often involves using models like the Capital Asset Pricing Model (CAPM) or event studies that benchmark returns against relevant market indices. This analysis helps investors make informed decisions on buying or selling stocks based on their performance relative to expected outcomes.
