Аннотация:Some especial characteristics of small and medium-sized enterprises are investigated in the context of the decision- making process on how to finance companies at different stages of their growth. In the study such enterprises are considered as micro-economic system in the unity of their relationships and interactions in dynamic environment. As it's been revealed the structure of the corporate capital significantly depends on the complex of internal and external factors: the stage in the life cycle of the organization, the type and concentration of ownership and some other static and dynamic characteristics of companies had been examined in the framework of regression analysis.