cOAlition S is an informal alliance of organisations and institutions that fund and/or perform research activities, and that have publicly expressed their intention to work together towards the implementation of the principles of Plan S.  cOAlition S does not have any autonomous legal capacity. The individual organisations remain fully responsible for implementing their Plan S-aligned Open Access policies.

The cOAlition S Office was set up in January 2020 and is hosted by the European Science Foundation (ESF) in Strasbourg, to support the work of cOAlition S.

Johan Rooryck, Professor of French Linguistics at Leiden University,  formerly the Open Access Champion, is the Executive Director of cOAlition S and is responsible for the representation, development, and implementation. Robert Kiley, Head of Open Research at the Wellcome Trust is coordinating the activities with the participating organisations. To help deliver the successful implementation of Plan S, Robert Kiley, will be seconded to cOAlition S as Head of Strategy, from 1st June 2021. Nora Papp-Le Roy acts as programme manager of the cOAlition S office at the European Science Foundation.