1. The Commission and the national competent authorities of the Member States enforcing the rules referred to in Article 1(6) shall cooperate with each other and inform each other about their respective enforcement actions through the European Competition Network (ECN). They shall have the power to provide one another with any information regarding a matter of fact or of law, including confidential information. Where the competent authority is not a member of the ECN, the Commission shall make the necessary arrangements for cooperation and exchange of information on cases concerning the enforcement of this Regulation and the enforcement of cases referred to in Article 1(6) of such authorities. The Commission may lay down such arrangements in an implementing act as referred to in Article 46(1), point (l).

2. Where a national competent authority of the Member States enforcing the rules referred to in Article 1(6) intends to launch an investigation on gatekeepers based on national laws referred to in Article 1(6), it shall inform the Commission in writing of the first formal investigative measure, before or immediately after the start of such measure. This information may also be made available to the national competent authorities enforcing the rules referred to in Article 1(6) of the other Member States.