Purpose This research introduces a new business model logic, highlighting value processes in and properties of platform business models to inform business model thinking from a systemic and dynamic perspective. It challenges the idea of firms managing, influencing and controlling entire activity systems. Design/methodology/approach The study traces the evolution of different approaches to business models and assesses theories that explain value cocreation and systemic value capture to develop a new business model logic. Findings Business model thinking has evolved away from Porter`s value chain to a new logic based on open networks and platforms. This study develops a framework for understanding platform business models from a systemic perspective. Derived from S-D logic, this new business model logic responds to phenomena in contemporary business environments characterized by increasing connectivity and sociality among actors. Research limitations The framework, developed from an extensive body of business model literature, has yet to be subjected to empirical investigation. Future research may involve the exploration of business model design processes and business model innovation from a systemic perspective. Practical implications Managers who aim to design their business models based on the logic of platform businesses require an understanding of their organisation's collaboration potential, technological interfaces, and potential to leverage network relationships. This research guides start-ups and incumbents to evaluate their platform potential. Originality This study systematically emancipates the business model logic from a firm-centered, inside-out perspective; focuses on network relationships beyond the customer-firm dyad, explains value processes beyond organizational borders and rethinks value capture from a systemic perspective.