The impact of mergers on acquiring firm shareholder wealth: The 1905–1930 experience

From the standpoint of investors successful acquisitions increase profitability and stock Contemporary studies find acquiring firm shareholders earning small gains before and large losses after consolidation. Using modern financial market procedures, we examine a portfolio of 191 acquiring firms from 1905 to 1930 to determine the impact on firm owners of early industrial acquisitions in the United States and the effect of institutional changes on takeover gains. Acquisitions from 1905 to 1930 raised shareholder wealth by more than 3 percent, an increase exceeding gains from more recent mergers. Stock price continued to rise after completion for acquisitions before World War I, but fell dramatically for acquisitions during the oligopoly merger wave of the late 1920s.We would like to thank Patrick Byrne and Tara Nussman for help in collecting the financial data, Ralph Nelson for permitting us to use his and Carl Eis's worksheets on merger activity from 1905 to 1930, and George Bittlingmayer, Malcolm Burns, David Gulley, Stephen Grubaugh, Lori Leeth, John Matsusaka, Dennis Mueller, Rexford Santerre, Scott Sumner, Tugrul Temel, and Nikhil Varaiya for their helpful comments.