Globalization, macroeconomic processes, and a quickly changeable competitive environment require a new level of development of national markets, which become more integrated. This all predetermines a requirement in defense of the interests of economic entities in relation to strengthening their positions on the proper markets through the introduction of different methods and instruments of an economic and legal character, in particular via the application of reorganization procedures. It is justified, that reorganization of economic organizations, as a legally effective form of solving economic and legal tasks for the preservation of the subject of economic activity and strengthening of the position on the proper market, ahead of a number of relevant objective economic (expansion of economic activity by means of application of synergy effect; diversification of production, capital and activity; increase of own capital; acquisition of assets at a price lower than the replacement cost; competitive advantages in creating barriers to eliminating potential competitors entering the market; additional advantages – possession of licenses, patents, know-how of other economic entities, which are at the disposal of another enterprise; loss of production or partial curtailment of activity; change of criteria of the form of doing business) and legal (the relevant requirements in the sphere of antimonopoly and competition legislation, tax legislation, legislation on the procedure and registration of shares issue, legislation on protection of legal rights and interests of creditors, participants (shareholders), employees, etc.) factors (prerequisites). It is proposed to consider the economic and legal prerequisites for reorganization of economic organizations as a complex set of interrelated economic and legal preliminary conditions, the presence of which directs the business entity to choose such an effective legal instrument as a reorganization to strengthen positions on the proper market, to deepen and expand the specialization of production costs, and, as a result, to increase competitiveness of manufactured products, to perform works, to provide services