An undertaking providing core platform services should be able, in exceptional circumstances, to rebut the presumption that the undertaking has a significant impact on the internal market by demonstrating that, although it meets the quantitative thresholds set out in this Regulation, it does not fulfil the requirements for designation as a gatekeeper. The burden of adducing evidence that the presumption deriving from the fulfilment of the quantitative thresholds should not apply should be borne by that undertaking. In its assessment of the evidence and arguments produced, the Commission should take into account only those elements which directly relate to the quantitative criteria, namely the impact of the undertaking providing core platform services on the internal market beyond revenue or market cap, such as its size in absolute terms, and the number of Member States in which it is present; by how much the actual business user and end user numbers exceed the thresholds and the importance of the undertaking’s core platform service considering the overall scale of activities of the respective core platform service; and the number of years for which the thresholds have been met.