Investment service providers other than portfolio management companies which provide the investment service referred to in Article L. 321-1 .4 shall not accept, unless they return them in full to the client, any remuneration, commission or other monetary or non-monetary benefit relating to the provision of the service to the client, paid or provided by a third party or by a person acting on behalf of a third party. Minor non-monetary benefits that are likely to improve the quality of the service provided to a customer and whose size and nature are such that they cannot be considered to interfere with the service provider’s duty to act in the customer’s best interests shall be clearly disclosed and shall not be subject to the requirements of this Article and Article L. 533-12-4.