Extensive research has emphasized the relevance and importance of separating explorative from exploitative activities within firms. Recently, several scholars have argued that, in order to be successful, the outcomes of such structurally separated explorative activities need to be integrated in the operational business units of the firm. Nevertheless, detailed research on how such integration can be realized is lacking. Based on in-depth case studies of seven large multinational, technology intensive companies, we find five transition modes on how interfaces between radical innovation units and operational business are managed effectively as a means to implement radical innovation on a company level: (1) external validating; (2) liaison channeling; (3) showcasing innovation; (4) network building; and (5) integrative innovation planning.