Judgment of the Court (Fourth Chamber) of 4 March 2020.#Mowi ASA v European Commission.#Appeal — Competition — Control of concentrations between undertakings — Regulation (EC) No 139/2004 — Article 4(1) — Prior notification obligation for concentrations — Article 7(1) — Standstill obligation — Article 7(2) — Exemption — Concept of a ‘single concentration’ — Article 14(2) — Decision imposing fines for the implementation of a concentration before it has been notified and authorised — Principle ne bis in idem — Set‑off principle — Concurrent offences.#Case C-10/18 P.