Judgment of the Court (Eighth Chamber) of 28 January 2021.#Qualcomm, Inc. and Qualcomm Europe, Inc. v European Commission.#Appeal – Competition – Abuse of dominant position – Market for UMTS-compliant baseband chipsets – Regulation (EC) No 1/2003 – Article 18(3) – Decision to request information – Necessity of the information requested – Proportionality – Burden of proof – Self-incrimination.#Case C-466/19 P.