New legal frameworks, such as Benefit Corporations in the United States and sociétés à mission in France, provide companies with a structure to ensure the long-term pursuit of multiple purposes. This paper explores the governance mechanisms of sociétés à mission and their ability to ensure adherence to these purposes. By focusing on the role of the mission committee, we identify a novel governance mechanism that emphasizes not extra-financial reporting or stakeholder participation, but rather the oversight of managerial decisions with the social or environmental purposes.