Today, many international economies are confronted with a new phenomenon of high-growth firms: unicorns. Those unicorn companies were able to perform outstanding growth rates and company valuations during the last years. For many of them, growth is the only way to success and therefore of huge strategic importance in order to survive. However, although a huge amount of literature exists about the growth of ‘traditional firms, previous research has not drawn attention to unicorn companies as an example for high-growth companies. As those unicorns can have enormous economic and social impacts, it is necessary that their route to success is valued and studied in more detail. As it is already argued by previous research, specific entrepreneurial characteristics like the educational level or prior experience can have an impact on the success of a growing company. Therefore, the aim of this paper is to add a new way of studying high-growth firms, by conducting a case survey including 52 international unicorns and investigating the relationships between entrepreneurial characteristics and the valuation of those unicorns.