Our expertise

Competition law is a key challenge for companies as it has a major impact on their operations:

  • Heightened powers of competition authorities (investigative power, injunctions, interim measures, etc.);
  • Increasingly high fines for breach;
  • Implementation of negotiated or alternative solutions to standard sanctions proceedings (leniency, settlement, commitments) requiring sharp strategic analysis of the issues at stake;
  • Simplifying and multiplying private enforcement action in response to the drive by EU law.


Competition rules on cartels or abuse of dominant position and how they connect with other issues (regulatory, intellectual property, etc.) make the task of evaluating the anticompetitive and consequently sanctionable nature of practices considered by companies or behaviour already in place on the given market very sensitive. Similarly, litigation brought before the competition authorities is strategic in view of the financial and reputational stakes at play.


Magenta helps companies with all issues involving competition law and provides bespoke support via the following services:

  • Analysing the legality of some commercial practices implemented or considered in the development of clients’ operations or carried out by some competitors.
  • Assisting with competition investigations and litigation as claimant or defendant brought before the competition authorities and/or European or national courts.
  • Setting up compliance programmes, training legal and commercial teams, conducting audits and simulating dawn raids.

Our work

Assisting a group specialising in nuclear plant decommissioning in cartel proceedings before the French Competition Authority.
Assisting several companies in competition investigations (in particular, in the electrical goods, and construction and civil engineering sectors).
Assisting a leading group in the premium tea sector in cartel proceedings before the French Competition Authority.
Assisting a leading group in the toys sector in commitment proceedings before the French Competition Authority.
Assisting and representing several companies in abuse of dominant position proceedings in the electronic communications sector.
Assisting and representing a maritime company in commitment proceedings before the French Competition Authority.
Obtaining partial cancellation of a sanction taken by the French Competition Authority.

State Aid

State aid issues may arise in various situations: sector-specific emergency plans, implementation of safeguarding measures targeting one or more companies or financing services of general economic interest, financing R&D projects or infrastructure development projects using public funds or via any preferential tax mechanisms granted to them.

Companies must pay very careful attention to the mechanisms available to them to directly or indirectly benefit from public funds to avoid being required to reimburse them if they prove to constitute unlawful state aid.

In contrast, companies that contribute to such measures or are harmed competitively by the mechanism implemented may have an interest in challenging them (including to obtain reimbursement of the contributions charged to them).

Magenta has a comprehensive understanding of these rules and assists clients to make sure that the mechanisms granted to them do not risk being classed as state aid or, on the contrary, if they wish to challenge the legality of a mechanism they consider unlawful.

Our work

Helping a public service company with the development of new commercial operations and compliance with applicable rules on state aid.
Assisting a central government department in assessing compliance of the right to state aid for various development initiatives.
Assisting a consortium in concluding a public private partnership with a French public institution that may include state aid.
Litigation before the administrative courts enabling several companies to obtain reimbursement of tax classed as state aid.
Assisting a leading air transport operator in filing a complaint with the European Commission for breach of the right to state aid under the French airport tax rebate mechanism provided by Article 1609 quatervicies of the French General Tax Code.

Private enforcement

Magenta is particularly active in private enforcement and helps clients as claimant or defendant with this type of litigation, supported by economic consulting firms.

Our work

Assisting and representing several companies as claimant or defendant in private enforcement proceedings in the telecoms, rail transport or pharmaceutical sectors.
Assisting an operator in the telecoms sector in proceedings brought against a competitor for disparagement practices in relation to its offering and network quality.

Our rankings

‘The Magenta team stands out due to knowing the regulated sectors extremely well. The firm has the enormous advantage of having very detailed technical knowledge of competition law and also of being able to give in-depth advice on economic subjects. Magenta also demonstrates great responsiveness to our requests which are sometimes made at the last minute.’

Legal500 2024
EU, competition and distribution

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 merger control, anti-competitive behaviour and cartel matters, and distribution law issues. The law firm is recognised for a particular know-how in the telecommunications sector, with further experience in the consumer goods industry.

Chambers & Partners 2024
Competition/European Law

Excellent en Concurrence et Distribution – Antitrust

Décideurs 2023

Sylvain Justier is recognised for his expertise handling cartel investigations, follow-on damages litigation and merger control cases. He often leverages his skill for the benefit of companies in the telecoms sector.

Chambers & Partners 2023
Competition/European Law

Competition / Antitrust Law

Best Lawyers 2020
Competition/Antitrust Law

The “very bright” Sylvain Justier represents clients before the French Competition Authority and French courts in antitrust investigations and litigations, encompassing horizontal and vertical practices as well as distribution law. He has strong experience in the telecommunications sector.

Chambers & Partners 2020
Competition/European Law

Magenta est une boutique spécialisée en droit de la concurrence, en droit public et dans les secteurs régulés. L’équipe d’une dizaine d’avocats accorde une forte expertise en droit de la concurrence avec une connaissance réglementaire pointue du secteur des télécoms. Le cabinet se voit mandater dans des dossiers de premier plan en lien avec ces aspects. Il a ainsi la charge de plusieurs affaires importantes d’abus de position dominante et de pratiques anticoncurrentielles en Polynésie Française et dans d’autres territoires d’Outre-Mer. Il intervient également dans des dossiers de contrôle des concentrations de premier plan dans le secteur des télécoms. Enfin, le cabinet est également missionné pour traiter de nombreux dossiers en dehors du domaine des télécoms. Il gère notamment plusieurs sujets sensibles en matière de droit de la distribution pour son client Carrefour. La pratique est dirigée par Sylvain Justier, qui est entouré de Vincent Jaunet et de Gaël Hichri qui a été promu associé en 2019.

Legal 500 Paris 2020
Droit Européen, concurrence et distribution

Competition / Antitrust Law

Best Lawyers 2019
Competition / Antitrust Law

Magenta combines its expertise in the field of competition and antitrust with an in-depth knowledge of regulatory issues to advise an impressive list of clients in the heavily regulated industry sectors such as energy, transport and telecoms. Counsel Gaël Hichri supports joint practice heads Sylvain Justier and Vincent Jaunet, who recently acted for CCFA – the professional association covering all French car manufacturers – in a review of its practices to ensure regulatory compliance. Associates Lolita Berthol-Balladur and Morgane Silhol are part of the team currently representing Candy Hoover with regard to the FCA’s investigation into alleged vertical and horizontal malpractices in the white and brown goods sector. Also notable is Justier’s work for Deutsche Bahn pertaining to two proceedings: a public enforcement claim filed by the FCA relating to alleged abuse of dominant position in the freight railway market, and a private enforcement action brought against SNCF after it was found guilty by the FCA of having impeded the growth of the French market. Other key clients include Outremer Telecom, SFR and Adista.

Legal 500 2019
EU, competition and distribution

Excellent en Contentieux et arbitrage – Antitrust & Pratiques Anticoncurrentielles

Décideurs 2018
Antitrust & Pratiques Anticoncurrentielles

Excellent en Contentieux et Arbitrage – Antitrust et Pratiques Anticoncurrentielles

Décideurs 2017
Antitrust et Pratiques Anticoncurrentielles