335 Those two parent companies constituted an undertaking with their subsidiaries during part of the infringement period and were considered to be jointly and severally liable with those subsidiaries for the period when they formed an undertaking together, which was reflected in a differentiated calculation of the 10% maximum amount (see, to that effect, judgment of 4 September 2014 in YKK and Others v Commission, C‐408/12 P, ECR, EU:C:2014:2153, paragraph 55 et seq.).
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