Judgment of the Court (Grand Chamber) of 3 September 2024.#Illumina Inc. and Grail LLC v European Commission.#Appeal – Competition – Concentrations – Pharmaceutical industry market – Genetic sequencing systems – Acquisition by Illumina Inc. of sole control over Grail LLC – Regulation (EC) No 139/2004 – Article 22 – Referral request from a national competition authority not having competence under national law to examine the concentration – Decision of the European Commission to examine that concentration – Commission decisions accepting requests from other national competition authorities to join the referral request – Competence of the Commission – Legal certainty.#Joined Cases C-611/22 P and C-625/22 P.