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 representation, development, and implementation. Robert Kiley, Head of Open Research at the Wellcome Trust is coordinating the activities with the participating organisations. Nora PappLe Roy acts as programme manager of the cOAlition S office at the European Science Foundation