International companies their business growth and development can not be achieved with orientation only to the domestic market thus spreading to other world markets, and through its lifespan break through the simplest form, that is, import, export, or more complex forms of business cooperation. The internationalization business is usually long-term process in which the international company goes through several development stages. The process is not simple and it is often difficult due to the many factors that affect the internationalization of the issue of culture, language, political and economic organization of countries. Given that changes can and should be managed if the organization wants to be competitive, it is necessary to understand the concept and types of organizational changes and their impact on the performance of the entire organization, or the performance of individuals. It is important to understand and the process of organizational changes that lead to changing the organization, growth, development and long-term survival, and their influence in building a sustainable competitive advantage. Through the work will be carried out empirical research in the form of interviews, and will be based on international companies from Croatian, which operates in 30 foreign markets. International companies need to know how to seize opportunities, and thay also need to know how to defend against threats. Strategic and change the organizational structure necessary to adapt to new situations, which is not an easy task. Therefore, only the strongest of them remain in the world markets and conquer the world with their business.