This article analyses the impact of the Great Recession and radical labour market deregulation on employer associations’ (EAs) membership levels and composition in Southern Europe. It also reviews the literature and advances it in four relevant aspects. First, it verifies a general decrease in membership of EAs in Southern Europe, almost to the point of collapse in Greece. Secondly, it identifies the greater importance of large companies (more than Fordist economic sectors) in the composition of this membership. Thirdly, it confirms that sectoral bargaining (as a major determinant) and union representation (an element weakened by reforms) are strong company-level incentives for membership in EAs. Finally, it re-examines the reasons put forward in the scholarly literature to explain why EAs in Southern Europe have not been in favour of these significant institutional changes.