Contrôle des concentrations

Merger control

Our expertise

To gain market share, improve visibility or develop new operations, companies may turn to external growth transactions (mergers, acquisitions, etc.) or create joint ventures.

If these projects exceed set turnover or market share thresholds, they may be subject to merger control procedures to prevent distorting competition on relevant markets (creating a monopoly, duopoly, dominant position, abusing a dominant position, etc.):

Magenta is well-versed in European and national rules on merger control and assists clients at all stages of M&A transactions and creation of joint ventures, in particular by:

  1. Examining whether the transaction may be subject to merger control and, if so, before which jurisdictions. In addition to examinations conducted by the French Competition Authority or the European Commission, Magenta can call on its local correspondent network to determine whether the transaction needs to be notified to a foreign competition authority;
  2. Advising clients in negotiating corporate documents:

  • Drafting conditions precedent to completion of the transaction on obtaining authorisation from the competition authorities;
  • Verifying clauses governing the interim period under merger law;
  • Controlling strategic information-sharing before obtaining the authorisation decision (anonymising information, setting up a data room, non-disclosure agreements, clean team agreements, etc.).

If necessary, preparing the notification, filing and monitoring before the decision is taken by the competition authority(ies):

  • Collecting information (by avoiding any sensitive information-sharing between the parties);
  • Analysing the impact of the transaction on markets and competition;
  • Dealings with the competition authorities (prior notification, filing notification, responding to questions and information requests);
  • If any serious competition concerns are raised, identifying commitments that may be proposed;

If necessary, Magenta can call on an economic consulting firm to provide support with the proposed market definitions.

Our work

Assisting CARAC in the acquisition of Ageas France.
Assisting Caisse des Dépôts et Consignation, Région Grand Est and BPCE Group in creating a joint venture for the acquisition and management of property assets in the tourism sector.
Assisting Stellantis Group in the acquisition of various concessions.
Assisting Pléiade Investissement in the acquisition of joint control of Generix Group in conjunction with Montefiore.
Assisting Compagnie du Lit Group in the tie-up with France Literie Group;
Assisting Spie ICS in the takeover of Infidis Group (digital services company).
Assisting the Siparex investment fund in the takeover of Destia (reference player in in-home services).
Assisting Generali Group in creating a joint venture in the life and disability insurance sector with Klesia, a mutual operator.

Our rankings

Magenta Société d’Avocats is a boutique firm with a focus on contentious competition mandates, advising clients on both public and private enforcement cases. The firm frequently represents clients before the FCA and the commercial courts. The lawyers have experience handling anti-competitive behaviour and cartel matters, as well as distribution law issues. In addition, it assists with merger control filings and competition law compliance issues. The law firm is recognised for a particular know-how in the transportation sector, with further experience in the consumer goods industry.

Ranking: Band 4

Chambers & Partners 2026
Competition / European law

Sylvain Justier is recognised for his expertise in handling investigations into alleged cartels and other anti-competitive practices, as well as merger control cases.

Ranking: Band 4

Chambers & Partners 2026
Competition / European law

Magenta, qui intervient sur l’ensemble du spectre du droit économique, de l’antitrust au droit de la distribution, en passant par le contrôle des concentrations et les aides d’État, accompagne ses clients devant les autorités administratives et judiciaires, y compris étrangères, dans le cadre de dossiers transfrontaliers.

Le cabinet peut se prévaloir d’être très actif dans les secteurs régulés, en particulier les télécoms, les transports, l’énergie et le pharmaceutique où il assiste une clientèle de renom à la fois en concurrence, en distribution et sur les questions réglementaires. Les membres de l’équipe sont également reconnus pour leur approche pragmatique des affaires qu’ils suivent.

2026 Rankings: 

Décideurs 2026
Economic law & European affairs

Sylvain Justier, Vincent Jaunet and Gaël Hichri lead the team at specialist competition, regulatory and public law boutique Magenta, which has an excellent reputation for representing clients in highly regulated sectors including telecoms, transportation, energy and pharmaceuticals. The firm houses a broad practice, with experience across the full range of merger control filings, cartel and abuse of dominance cases, follow-on damages claims, and state aid issues. Distribution law, including disputes between distributors and suppliers, is another area of expertise.

Legal500 2025
EU, competition and distribution

Frequently represents clients before the French Competition Authority and the commercial courts. Has experience of handling cartel investigations and abuse of dominance matters and also assists with distribution law. Recognised for particular know-how in the telecommunications sector with further experience in the pharmaceuticals industry. Also active in French Polynesia.

Chambers & Partners 2020
Competition/European Law

Magenta is a French boutique dedicated to competition, regulatory and public law issues. The group notably manages key abuse of dominant position and anticompetitive antitrust cases in Polynesia and other French overseas territories in addition to handling high-profile merger control issues, often for telecoms clients, but also for clients from other sectors. Leading mass retailer Carrefour has entrusted highly sensitive matters in the distribution sector to the team.

Legal 500 2020
Competition/European Law