This symposium brings together four studies of ecosystem actor (re-)configuration. In ecosystems, value creation and value capture strongly depend on the configuration of actors and the innovations they develop. This symposium focuses on the question of how such configurations emerge and change. The presenters approach this question from diverse viewpoints (from bottlenecks imposing strategic directions to endogenous shaping processes) and through a broad range of contexts and methods. Together, they help form a more complete understanding of the drivers and consequences of ecosystem structure. Ecosystem Bottlenecks and Industry Evolution Presenter: Rahul Kapoor; The Wharton School, U. of Pennsylvania Presenter: Kathleen Eisenhardt; Stanford U. Power Distribution and Leverage in the Music Streaming Ecosystem: Evidence from Spotify Playlists Presenter: Luis Aguiar; U. of Zurich Presenter: Joel Waldfogel; Carlson School of Management Presenter: Axel Zeijen; ETH Zürich Battle for the Core? How Industry Leaders Leverage Digital Technologies to Shape their Ecosystems Presenter: Xavier Mundet; ETH Zürich Presenter: Mary Tripsas; U. of California, Santa Barbara Forced Ecosystems and Digital Stepchildren Presenter: Pinar Ozcan; Oxford U., Saïd Business School Presenter: Douglas Hannah; Boston U.