New evidence on shareholder wealth effects in bank mergers during 1980-2000

This paper employs two unique bank event study methodologies to calculate abnormal returns for bidder, target and combined firms. The first methodology is a modified market model that controls for shocks common to the banking industry. The second is an EGARCH (1, 1) model that adjusts for the violated regression assumptions of the traditional market model event study. The results of both methodologies reveal that target shareholders enjoy significantly positive abnormal returns, whereas the bidder shareholders experience significantly negative abnormal returns. Overall, announcements of bank mergers generate positive wealth effects for the combined shareholders. However, the evidence presented in this paper underscores the importance of the choice of models describing stock returns in examining the impact of bank mergers.