(4)In order to ensure a fair and clear allocation of fees which, at the same time, reflects the actual administrative burden per supervised entity, the supervisory fee should be calculated according to the credit rating agencies’ turnover, generated from rating activities and ancillary services, since the cost of supervision is higher for larger credit rating agencies than for smaller ones. Moreover, the provision of ancillary services requires additional supervisory effort as possible conflicts of interests resulting from the provision of ancillary services need monitoring. Credit rating agencies should not circumvent the fair allocation of fees according to this Regulation by reallocating revenue to other entities within their group in order to reduce their fee contributions. ESMA should monitor and report any critical developments in this respect.