1. The competent authorities shall cooperate whenever necessary for the purpose of carrying out their duties and shall exchange any information required for that purpose.
2. Where a half-yearly report has to be published in more than one Member State, the competent authorities of these Member States shall, by way of derogation from Article 3, use their best endeavours to accept as a single text the text which meets the requirements of the Member State in which the company's shares were admitted to official listing for the first time or the text which most closely approximates to that text. In cases of simultaneous admission to official listing on two or more stock exchanges situated or operating in different Member States, the competent authorities of the Member States concerned shall use their best endeavours to accept as a single text the text of the report which meets the requirements of the Member State in which the company's head office is situated; if the company's head offi