Overview

Price Anomalies are observed patterns in the markets that cannot easily be accounted for with the efficient market hypothesis

Common Anomalies

• Calendar Effects - anomalies that occur around certain days on the calendar.
• S&P 500 Index Change Effect - anomalies that are related to the change in the composition of the S&P 500
• Analyst Anomalies - anomalies related to the analyst recommendations
• Earnings Announcements
• Fama French Anomalies - the Fama French Factor Model (which includes value and size factors) is considered by some to be anomalies.