The valuation effects of bank mergers

Abstract

This paper examines the valuation effects of a sample of 558 bank mergers from 1980–1997. The overall results indicate that bank mergers create wealth. On average over a 36-day (−30, +5) event window, targets gain over 22%, bidders break even, and combined firms gain 3%. The results further indicate that mergers in the 1990s, which have not been extensively studied in prior work, have positive effects. In the 1990s over the 36-day window: target gain significantly, bidder returns are positive and statistically larger than the mid-1980s, and combined firm returns are significantly positive. These results are consistent with the notion that bank mergers occur for synergistic reasons and are not the result of empire building. However, bidder returns are sensitive to the event window implemented. Examining returns over an 11-day (−5, +5) window, target returns remain significantly positive, while bidder returns are statistically negative, and combined firm returns are statistically positive. Results over both windows indicate that overall wealth effects from bank mergers are positive over time, particularly in the 1990s.