The current study provides empirical insight into the nature of creating relational rents when managing business relationships in the context of the emerging Russian economy. Addressing both formal and social business network relationships, the study aims to understand the role of a systematic and purposeful approach to building and managing business relationships in order to generate superior relational advantage. The study explores the effects on both subjectively and objectively measured relational rents. Additionally, the role of institutional context in both shaping relationships and obtaining relational rents is considered through the inclusion of dysfunctional competition and institutional support. The results of a survey on a sample of 148 business-to-business firms demonstrate the leading role of the business relationship portfolio in generating relational rents, as well as the supporting role of relational capabilities in building this relationship portfolio. These effects are significantly affected by institutional moderators, demonstrating multidirectional effects on the mechanisms behind building relationships and obtaining the associated relational advantage.