Sobiranistes was initially constituted on 23 October 2018 as a political platform the Catalunya en Comú–Podem group in the Parliament of Catalonia by deputies Elisenda Alamany and Joan Josep Nuet, under the Som comuns, som sobiranistes (We are common, we are sovereigntist) motto. The goal of the platform was to "right" the course of the perceived drift of CatComú towards "the vices of traditional parties", were very critical of the role of Initiative for Catalonia Greens (ICV) within the party, and accused CatComú's leader Ada Colau of having "abandoned sovereigntism" and of "disbanding Xavier Domènech's team", after the latter's resigned as Podemos regional secretary-general and Catalan deputy. CatComú's leadership would criticize Alamany for "poor transparency" as well as the platform's establishment not being done according to internal party procedures.
