The merger of the Malaysian domestic banks was enforced by the government in the year 1999 after years of persuasion with little success. This study endeavors to measure the impact of the involuntary merger on the efficiency gains. Merger and acquisition of domestic banks improved the banks’ performance, profitability and value creation as indicated by Bank Negara Malaysia in 1999. The central bank of Malaysia (Bank Negara Malaysia) reassures banks to merge with other banking institution in order to bring about the economies of scale and to provide a higher level of efficiency. Subsequent to the mergers, there were only nine commercial banks left to form a completely new corporation. The secondary data was derived from the nine domestic banks from the year 2005 to 2009 were accumulated and analyzed using the DEA method. Mergers had unique advantages in terms of industry efficiency.