The entrepreneurial-ecosystem concept has recently gained renewed attention among entrepreneurship scholars, yet research in the fields of regional studies and international entrepreneurship has stayed notably silent on the role that incubating environments can have in driving entrepreneurial activities in developing rapidly internationalising born-global (BG) firms.In this exploratory study, we seek to further the discussion on the role that the entrepreneurial ecosystem can have in the research on international entrepreneurship affecting firm development. We assess entrepreneurial ecosystems in Finland and Estonia from the point of view of BG entrepreneurs and do so in a transnational-ecosystem context. Using a survey method and data analysis employing an analysis of variance (ANOVA), this study contributes to the literature on regional studies and international entrepreneurship by examining which of the transnational entrepreneurial ecosystem's structural elements are critical for start-ups during their developmental stages and how these elements are perceived differently depending on the characteristics of BG firms. The study thus enhances understanding of the interactions of the transnational entrepreneurial ecosystem and its role in supporting new ventures.