1. Market participants entering into transactions which are required to be reported to the Agency in accordance with Article 8(1) shall register with the national regulatory authority in the Member State in which they are established or resident or, if they are not established or resident in the Union, in a Member State in which they are active.
A market participant shall register only with one national regulatory authority. Member States shall not require a market participant already registered in another Member State to register again.
The registration of market participants is without prejudice to obligations to comply with applicable trading and balancing rules.
2. Not later than 3 months after the date on which the Commission adopts the implementing acts set out in Article 8(2), national regulatory authorities shall establish national registers of market participants which they shall keep up to date. The register shall give each market participant a unique identifier and shall contain sufficient information to identify the market participant, including relevant details relating to its value added tax number, its place of establishment, the persons responsible for its operational and trading decisions, and the ultimate controller or beneficiary of the market participant's trading activities.
3. National regulatory authorities shall transmit the information in their national registers to the Agency in a format determined by the Agency. The Agency shall, in cooperation with those authorities, determine that format and shall publish it by 29 June 2012. Based on the information provided by national regulatory authorities, the Agency shall establish a European register of market participants. National regulatory authorities and other relevant authorities shall have access to the European register. Subject to Article 17, the Agency may decide to make the European register, or extracts thereof, publicly available provided that commercially sensitive information on individual market participants is not disclosed.
4. Market participants referred to in paragraph 1 of this Article shall submit the registration form to the national regulatory authority prior to entering into a transaction which is required to be reported to the Agency in accordance with Article 8(1).
5. Market participants referred to in paragraph 1 shall communicate promptly to the national regulatory authority any change which has taken place as regards the information provided in the registration form.