In two- or multi-sided platform ecosystems, the platform owner governs value generation between and for multiple groups of participants, such as users and complementors, and influences whether and how these ecosystems grow. Most prior research examined the impact of formal mechanisms (like application programming interfaces or software development kits) of these platform strategies, paying little attention to relational and informal factors like collaborative governance with the involvement of complementors, differences between platform ownership structures, and the context of industry or country-level differences. Our symposium is devoted to shed light on this new frontier in platform research. By drawing upon multiple methodologies and studying platform markets across countries, we aim to advance our understanding of the relational and informal side of platform strategy. Governing the Dynamics of Platforms and Complementors – a Value-Based Approach Author: Tobias Kretschmer; LMU Munich Power in Digital Platforms: Examining How Dependencies Impact Partner Organizing in Cloud Ecosystems Author: Greetje Frankje Corporaal; Rotterdam School of Management Author: Devika Narayan; U. of Bristol Internationalization of Digital Platforms: A Configurational Approach Author: Madeleine Bausch; U. of Chile Author: Anastasiya Shylina; U. of Passau Author: Andreas Sebastian Konig; U. of Passau The Role of Platform Ownership for Governance Mechanisms in Emerging Digital Industrial Platforms Author: Robin Nowak; U. of Passau Author: Patrick Figge; U. of Passau Author: Carolin Haeussler; U. of Passau Collaborative Marketplace Governance: How and When Transaction Platforms Give Users a Say Author: Christian Bruck; WU Vienna U. of Economics and Business Author: Georg Reischauer; WU Vienna & JKU Linz Author: Werner Helmut Hoffmann; WU Vienna U. of Economics and Business