While companies based on the capitalist model have difficulty to satisfy current social expectations, those of the Social Sector are naturally inclined to. But, this second model has a cost and social enterprises suffer from a deficit of means to finance what make their specificity. They thus organize themselves in network to bring a collective response to their markets. Considering the importance of this added value, particularly in the context of a sustainable economy, the governance devices of these companies are directly put in contribution to favor the emergence of collective networks within the Social Sector. The objective is to build partnerships which, forward, will generate a social capital for all the organizations. That is what tries to show the author in this qualitative research based on the examples of three social enterprises of the french insurance sector.