108Where persons with separate legal personalities are organised as a group, it is settled case-law that those persons form a single undertaking when they do not decide independently upon their own conduct on the market in question but, having regard, more specifically, to the economic, organisational and legal links between those persons and a parent company, those companies are subject to the effects, to that end, of the actual exercise of that decisive influence, by being run as one (see, to that effect, judgment of 25 March 2021, Deutsche Telekom v Commission, C‑152/19 P, EU:C:2021:238, paragraphs 74 and 75).
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