The Estonian business ecosystem has fostered the creation of 10 technology unicorns and numerous startups. By integrating the concept of hidden champions with empirical evidence on innovative Estonian companies, this chapter examines the cases of Milrem, Starship Technologies, and Ready Player Me. Each of these companies has established global market niches that did not exist a decade ago. These hidden technology champions have pushed industry boundaries by combining high-end manufacturing with services, as seen in the cases of Milrem and Starship Technologies. Additionally, they have integrated the business-to-business and business-to-consumer segments, exemplified by Starship Technologies and Ready Player Me. The broader business ecosystem has been a key enabler of these innovative business models. To provide a deeper understanding of the evolution of Estonia’s business environment, this chapter highlights major economic reforms of recent decades and essential components of the current ecosystem. The final section presents key lessons drawn from the Estonian experience.