Article 4
1. Member States shall, in accordance with the risk-based approach, ensure that the scope of this Directive is extended in whole or in part to professions and to categories of undertakings, other than the obliged entities referred to in Article 2(1), which engage in activities which are particularly likely to be used for the purposes of money laundering or terrorist financing. 2. Where a Member State extends the scope of this Directive to professions or to categories of undertaking other than those referred to in Article 2(1), it shall inform the Commission thereof.