An important but unexplored research issue is understanding how digital innovation ecosystem and a quintuple helix model can support the promotion of Circular Economy. Circular Economy, however, is intrinsically linked to the innovation issue. It can occur in a productive and consumption system under the form of a new product, process, organizational or marketing model. In the meantime, the digital innovation ecosystem debate was enriched by the social and environmental sustainability perspectives that are the pillars of the Circular Economy theory. Despite this, the research has failed to achieve full comprehension of digital innovation ecosystems' dynamics and processes for the Circular Economy, by highlighting the need for deeper understanding. Under the above assumptions, this paper presents the evidence of a single and extreme case study related to the Italian Circular Economy Stakeholder Platform (ICESP). This is shown as good practice of a digital platform for stakeholders' engagement, supporting the creation of a digital innovation ecosystem focused on the Circular Economy. We conclude by deriving implications for researchers and policy makers' agendas. © 2020 World Scientific Publishing Company.

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