This document, prepared for the European Commission, assesses the size and presence of the collaborative economy in Europe, focusing on five key sectors which generated nearly €4bn in revenues and facilitated €28bn in transactions in 2015. The report highlights significant growth and regulatory challenges faced by this economy, emphasizing its role as a socio-economic trend reshaping interactions and economic models in Europe. The findings aim to inform the development of a balanced policy and regulatory framework to support this evolving sector.