Corporate venture (CV) units constitute vehicles through which firms may act ambidextrously, thereby increasing their longevity, but they suffer from a high failure rate. The authors examine why and how some CV units last significantly longer than others. They argue that CV units endure by developing an ambidextrous orientation themselves�they build new capabilities for the parent firm while simultaneously leveraging its existing strengths. They argue that CV units become ambidextrous by nurturing a supportive relational context, defined by the strength of their relationships with three different sets of actors�parent firm executives, business unit managers, and members of the venture capital community. Using primary data collected from 95 CV units over a three-year period, the authors test and find support for these arguments.