Case C-605/18: Judgment of the Court (Fourth Chamber) of 9 September 2021 (request for a preliminary ruling from the Bundesverwaltungsgericht — Austria) — Adler Real Estate AG, Petrus Advisers LLP, GM v Finanzmarktaufsichtsbehörde (FMA) (Reference for a preliminary ruling — Securities admitted to trading on a regulated market situated or operating within a Member State — Transparency requirement — Notification of ‘major holdings’ acquired in companies by ‘persons acting in concert’ — Directive 2004/109/EC — Article 3(1a), fourth subparagraph — Concept of ‘more stringent requirements’ — Directive 2004/25/EC — ‘Supervision’ by an authority appointed pursuant to Article 4 of that directive)