Résumé : There are numerous social innovation networks and initiatives worldwide with the ambition tocontribute to transformative change towards more sustainable, resilient and just societies. Manyof these have a specific vision on the economy and relate to alternative visions of a ‘New Economy’.This paper highlights four prominent strands of new economy thinking in state-of-the-artdiscussions: degrowth, collaborative economy, solidarity economy, and social entrepreneurship.Taking a perspective of transformative social innovation, the paper draws on case studies of 12social innovation initiatives to analyse how these relate to new economies and to transitionstoward new economic arrangements. The 12 cases are analysed in terms of a) how they relate tonarratives of change on new economies, b) how they renew social relations, and c) how their neweconomy arrangements hold potential to challenge established institutional constellations in theexisting economy.