Thomas specialises in competition law and compliance.

Thomas is a partner in our Competition & EU practice, based in Paris.

His practice covers both contentious and non-contentious national and European competition law, together with commercial and distribution law. He is also active in the field of compliance.

Thomas has substantial experience in advising on cartel investigations and assisting companies in preparing leniency applications before the European Commission and the French Competition Authority. He helps to develop and implement competition and compliance programs and provides assistance in notifications of transactions to the European Commission under the EC Merger Regulation and as well as to the French Competition Authority.

Thomas’ experience of competition law covers different angles, having previously worked in practice, in house and also having completed an internship at the French Competition Authority. Prior to joining us he worked for 14 years in the Paris office of a major global law firm.

On the commercial side, Thomas has experience in advising clients on the structuring of selective, exclusive or franchise distribution networks across Europe, as well as advising on supplier-distributors relationships and sales regulations. He also regularly assists clients in relation to product liability issues.

In the field of compliance, Thomas assists companies in the implementation of their antibribery prevention plan and whistleblowing system under the Sapin II law.
Thomas regularly participates in seminars and conferences and is the author of several articles on competition law. He is a member of the association of competition law practitioners (APDC) and as well as the French association for the study of competition Law (AFEC).

Admitted to the Paris Bar in 2000, Thomas holds a Post Graduate Diploma in Competition Law from the Faculty of Economics in Rennes, an LL.M in International Business from the University of Manchester and an LL.B in European Business law from the Faculty of law in Strasbourg. He speaks French and English.

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Lawyer Testimonials
  1. “Thomas Oster is well reputed for his excellent skills, along with his ability to handle sensitive matters. He focuses on French and European competition law. He also advises on distribution law and consumer protection cases.”

    Chambers Europe 2017
  2. "His modesty, his pragmatism, his ability to listen, and also his technical competences. I would also say that he is reliable with deadlines, his command – he is fully bilingual."

    Acritas Star 2017
  3. “Thomas Oster is very reactive and has perfect technical skills”

    Legal 500 2015