Work integration social enterprises (WISEs) exist to fight poverty and social exclusion. They offer support and guidance to those at risk of exclusion to help these individuals join the labour market. This study examines the relationship between social enterprises (specifically, work integration social enterprises) and their social impact, considered here in the form of social sustainability. This article presents the results of empirical analysis of 62 Spanish work integration social enterprises using fuzzy-set qualitative comparative analysis. The article focuses on the entrepreneurial characteristics of the companies’ founders and managers as drivers of social value creation. Specifically, the study examines their entrepreneurial traits, capabilities, orientation, and behaviour. The results show the importance of the training that social entrepreneurs receive, as well as the structure and planning of social enterprises