Article 4 4.

The supervisory authorities of the Member States for the purposes of this Directive and other authorities supervising capital markets, in particular in accordance with Directive 93/22/EEC, Directive 2001/34/EC, Directive 2003/6/EC and Directive 2003/71/EC of the European Parliament and of the Council of 4 November 2003 on the prospectus to be published when securities are offered to the public or admitted to trading shall cooperate and supply each other with information wherever necessary for the application of the rules drawn up in accordance with this Directive and in particular in cases covered by paragraph 2(b), (c) and (e). Information thus exchanged shall be covered by the obligation of professional secrecy to which persons employed or formerly employed by the supervisory authorities receiving the information are subject. Cooperation shall include the ability to serve the legal documents necessary to enforce measures taken by the competent authorities in connection with bids, as well as such other assistance as may reasonably be requested by the supervisory authorities concerned for the purpose of investigating any actual or alleged breaches of the rules made or introduced pursuant to this Directive.