Presented paper aims to investigate internationalization of multinational company by exploring the main proactive and reactive factors impacting internationalization process. The authors strive to reveal the patterns of internationalization taking into account the aspects of the main theoretical models. The research is based on the main ideas of stage, learning and contingency approaches. The main proactive and reactive factors impacting internationalization process are based on the previous studies. The authors develop a research methodology and discuss main findings of the case study and survey. Results of the empirical investigation allow concluding that internationalization of a multinational company was initiated by several factors, namely environment, market, home and production.