Judgment of the Court (Third Chamber) of 18 December 2025.#« Lukoil Bulgaria » EOOD v Komisia za zashtita na konkurentsiata.#Reference for a preliminary ruling – Competition – Article 102 TFEU – Abuse of a dominant position – Wholesale market for fuel in Bulgaria – Margin squeeze on competitors – Product market definition – Vertically divided market – Taking into account the excise duty regime.#Case C-260/24.