LAWYER PROFILE

Sylvain Justier

France 2026

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Ranked in 2 practice areas

About

Provided by Magenta Société d'Avocats

France

Practice Areas

Sylvain Justier has wide experience in competition law and handles numerous antitrust cases before the competition authorities and national courts. He provides a presence on the occasion of dawn raids and contests such operations. He represents applicant and defending businesses in cartel and abuse of dominant position cases, indemnities-based litigation associated with anti-competitive practices (having to date been involved in ten sets of private enfoncement cases in which sums of between several million and hundreds of millions of Euros were at stake). He also becomes involved in merger control, restrictive competitive practice and unfair competition cases.

In addition, he is a recognised expert in a number of regulated sectors, in particular the telecoms, energy and rail transport sectors. In addition to antitrust cases handled within these sectors, he becomes involved in all the problem regulatory issues his clients come up against and assists them with these, especially in the context of penalty proceedings or proceedings for handling disputes being heard before sectoral regulatory bodies (having been involved in numerous proceedings before the ARCEP – French Telecom – and ART - French Rail- regulatory bodies in particular).

Chambers Review

Provided by Chambers

Chambers France

TMT: Telecommunications - France

Band 1
Band 1

Individual Editorial

Sylvain Justier of Magenta Société d'Avocats draws on his expertise in competition law to offer telecoms companies advice on litigation related to antitrust investigations. He also assists clients with regulatory mandates.

Editorial individuel

Sylvain Justier de Magenta Société d’Avocats s’appuie sur son expertise en droit de la concurrence pour conseiller les entreprises de télécommunications dans le cadre de contentieux liés aux enquêtes antitrust. Il assiste également les clients dans le cadre de mandats réglementaires.

Competition/European Law - France

Band 4
Band 4

Individual Editorial

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

Editorial individuel

Sylvain Justier est reconnu pour son expertise dans le traitement des enquêtes sur des ententes et autres pratiques anticoncurrentielles, des contentieux de réclamations de dommages et de contrôle des concentrations.

Strengths

Provided by Chambers

  • Sylvain Justier offers clarity and support.

    TMT: TelecommunicationsChambers France
  • Sylvain Justier has extensive experience in competition law and the telecommunications sector. This expertise, responsiveness, and vision make him a leading expert in competition and regulatory law.

    TMT: TelecommunicationsChambers France
  • He is truly an expert in his field, providing a stand out service across the board.

    TMT: TelecommunicationsChambers France
  • C'est un véritable expert dans son domaine, offrant un service exceptionnel à tous les niveaux.

    TMT: TelecommunicationsChambers France
  • Il possède une vaste expérience en droit de la concurrence et dans le secteur des télécommunications. Son expertise, sa réactivité et sa vision font de lui un expert en droit réglementaire.

    TMT: TelecommunicationsChambers France
  • Sylvain Justier offre clarté et soutien.
    TMT: TelecommunicationsChambers France

Ranked Individuals at Magenta Société d'Avocats (4)

France

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