Existing conceptualizations of the demos fail to treat issues of composition and performativity consistently. Recent literature suggests that both aspects are required in a satisfactory account of the demos. An analysis of this literature suggests several desiderata that such an account must meet. I approach the definition of demos with a conceptual framework derived from Margaret Gilbert’s plural subject theory of social groups. I propose an account of demos as a plural subject, constituted by joint commitment. This account offers an improved and consistent understanding of normativity, composition, agency, and cohesion of demos.