At the end of twentieth century there were acquisition dominated business transaction within national scale and also international scale. In the international term there is known acquisition across border. corporate acquisition is one amongst many business strategies for developing corporation within home country and abroad without necessitated to set up a new legal business entity. Acquisition becomes a faster and easier selection in getting financial return. A rampant acquisition of corporation at this moment need to be supervised closely and carefully by many parties since the trend of dominant acquisition many break Antimonopoly Law and Banking law as happening with Maybank acquisition of BII. There is indication that the acquisition of BII's shares have broken Bank Indonesia regulation concerning single presence policy on Indonesia Banking. Nevertheless until now, the growing activities of shares acquisition across border have not comprehensively been regulated yet into regulation of Limited Corporation Law, Antimonopoly Law and Indonesia Banking Law.