Managerial practices underpin most global policy agendas. Existing research shows how these practices have reshaped the public sector, facilitated the marketization of problems, and altered organizational structures. This article highlights that managerial practices are also a central driver of political marginalization. When incorporated into multistakeholder processes, managerial practices engender two exclusionary processes: the accommodation of dissent and the uniformization of political subjects. They do so by making consensus an organizational goal and by treating politics as a marketplace. Through an examination of the United Nations Food Systems Summit, the article shows how, within multistakeholder models, managerialism sidelines critical voices by invoking ideals of openness, spontaneity, and the absence of rule, rather than traditional principles of ‘command and control’. Additionally, it unpacks the novel roles assumed by private consultancy firms, which are nowadays not only tasked with implementing weighty bureaucratic reforms but are also increasingly involved in ‘optimizing’ political struggles and shaping debates on how societies ought to be governed.