The dynamics and growth of firms are considered to be important for enhancing economic growth. Organizations can benefit from growth in many ways, including greater efficiency through economies of scale, increased power, the ability to withstand environmental change, increased profit and increased prestige for organizational members.It is important to obtain a better grip on the growth development of start-ups. The aim of this study is to map the development of start-ups in terms of employment growth and, in addition, to understand: what are the determinants of growth of start-ups?