The Differential Information Content of Earnings Announcements: The Case of Merger

Abstract

The differential information content hypothesis implies that the magnitude of the abnormal return is a function of firm characteristics such as size or quality of reported earnings. Previous studies, however, provide little linkage to the relationship between firm characteristic changes and stock return behavior around the earnings announcement date. This study examines this relationship with 102 sample firms that experienced mergers from 1977 to 1984. For a sample of firms whose future uncertainty (measured by firm variance) was reduced by merger, a significant reduction in the marginal information content of the earnings announcement after merger was observed. This reduction did not occur, however, for variance-increasing merger firms or for pair-matched control firms. Similar results were obtained when the firms future uncertainty was measured by merger type classified by how closely industries of merging firms were related.