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How Important Are Earnings Announcements As An Information Source?, Sudipta Basu, Truong Xuan Duong, Stanimir Markov, Eng Joo Tan

Research Collection Lee Kong Chian School Of Business

In a competitive information market, a single information source can only dominate other sources individually, not collectively. We explore whether earnings announcements constitute such a dominant source using Ball and Shivakumar's (2008) [How much new information is there in earnings?, Journal of Accounting Research, 2008, 46(5), pp. 975–1016] R ² metric: the proportion of the variation in annual returns explained by the four quarterly earnings announcement returns. We find that the earnings announcement days' R ² is 11% – higher than the corresponding R ² of days with dividend announcements, management forecasts, preannouncements, and 10-K and 10-Q filings and …