This master’s research investigates how Nordic cleantech firms exploit opportunities in emerging markets. Emerging markets showcase significant opportunities for provision of sustainable cleantech solutions, which can be exploited by cleantech firms to enhance their commercial viability. Opportunity exploitation studies in emerging market contexts have been largely understudied in international entrepreneurship. This qualitative research utilized semi-structured interviews, a multi case study design involving three Nordic cleantech firms, and thematic data analysis to collect detailed information on Nordic cleantech opportunity exploitation activities and stages. Analyzing the findings using a conceptual framework based on the opportunity exploitation theory, we discover that Nordic cleantech firms exploit opportunities in emerging markets in three phases namely, exploitation pre-operationalization phase, exploitation operationalization phase and exploitation post-operationalization phase. Exploitation pre-operationalization stages involve making evaluation of the opportunity, assessing stakeholders, and developing a project management plan for the exploitation operationalization; the exploitation operationalization phase covers the market entry modes, and describes activities and strategies deployed by cleantech firms to commence commercial activities within the market; and the exploitation post-operationalization phase describe steps taken to increase the firms’ knowledge and leverage such experiential knowledge for further opportunity exploitation. The research findings showed a variance from the theoretical opportunity exploitation propositions for new technology intensive firms including cleantech firms. The insights generated from this research have implications for the decision making of managers of Nordic cleantech firms looking to exploit international opportunities within emerging markets and theoretical implications for making further opportunity exploration studies considering the emerging market context.