Purpose This study aims to investigate how mature born global firms create value for customers to achieve continued international growth. Design/methodology/approach The study employs a case study approach to investigate the under-researched area of how mature born globals create value for customers and, by doing so, contribute to their continued international growth. This in-depth examination of how three born globals developed over time uses interviews, observation and secondary data. Findings The findings indicate that the entrepreneurs of born global firms, that continued to grow, created a culture in the early stages that supported value creation for foreign customers. These firms have built a competitive position by developing international niche products. They have also implemented a combination of proactive and reactive market orientation to facilitate the creation and delivery of value to customers. To maintain growth, they further invest the revenues earned on additional international marketing activities and continuously enhance their focal products. Originality/value Research on born globals has focused on the early stages of their internationalization processes, while largely neglecting the later stages (mature born globals) or the factors that lead to continued international growth. To address this gap, this study explores what happens when born globals 'grow up'. This study contributes to the literature by capturing the factors and processes underlying how mature born globals create value for customers, for international growth. In particular, the study shows that the culture and strategies developed in the born globals' early stages also lead to international growth in later stages. The mature born globals have also invested in niche products, brand building, and effective market channels and adopted a combination of proactive and reactive market orientations.