Definition: main establishment: main establishment

: (a) as regards a controller with establishments in more than one Member State, the place of its central administration in the Union, unless the decisions on the purposes and means of the processing of personal data are taken in another establishment of the controller in the Union and the latter establishment has the power to have such decisions implemented, in which case the establishment having taken such decisions is to be considered to be the main establishment; (b) as regards a processor with establishments in more than one Member State, the place of its central administration in the Uni