EN
Major results of economic globalisation are concentration processes, which take place in the world economy. In the paper there were shown such main forms of concentration as fusions and takeovers. Their types and consequences (often negative ones) for joining transnational corporations were also presented. The second part of the article shows development of these forms of concentration in the world and in Poland, their quantity and value as well as the largest transactions of fusions and takeovers, which happened last years. Analysis confirms the fact that though the most of transactions finish as failures, there still has been large interest of corporations to be joined. Moreover, after down tendency last years, new rising tendency of these forms of concentrations is beginning.