Judgment of the Court (Grand Chamber) of 19 December 2018.#Silvio Berlusconi and Finanziaria d'investimento Fininvest SpA (Fininvest) v Banca d'Italia and Istituto per la Vigilanza Sulle Assicurazioni (IVASS).#Request for a preliminary ruling from the Consiglio di Stato.#Reference for a preliminary ruling — Approximation of laws — Prudential supervision of credit institutions — Acquisition of a qualifying holding in a credit institution — Procedure governed by Directive 2013/36/EU and by Regulations (EU) No 1024/2013 and No 468/2014 — Composite administrative procedure — Exclusive decision-making power of the European Central Bank (ECB) — Action brought against preparatory acts adopted by the national competent authority — Claim that the force of res judicata attaching to a national decision has been disregarded.#Case C-219/17.