Judgment of the Court (Sixth Chamber) of 6 March 2025.#European Commission v Grand Duchy of Luxembourg.#Failure of a Member State to fulfil obligations – Article 258 TFEU – Protection of persons who report breaches of Union law – Directive (EU) 2019/1937 – Article 26(1) and (3) – Failure to transpose and communicate transposition measures – Article 260(3) TFEU – Application for the imposition of a lump sum – Criteria for establishing the amount of the penalty – Automatic application of a coefficient for seriousness.#Case C-150/23.