Marc Barennes


+ 33 788 25 46 96



Marc Barennes is a partner with Geradin Partners. 

Marc benefits from a unique 360-degree experience in competition litigation and counseling. Over the past 20plus years, he has been a European Commission official (DG COMP), a référendaire (Senior Court Advisor) with the General Court of the European Union, the executive director of a European competition claim aggregator based in Luxembourg, as well as a competition lawyer based in Paris and Brussels. 

As a case and policy officer with DG Competition (2001 and 2003 to 2006), Marc led dawn raids, largely contributed to the development of leniency applications, carried out investigations (RFI and interviews), drafted a Statement of Objections and a fining decision. He also contributed to the drafting of several Commission policy instruments and internal guidelines. 

As a référendaire with the General Court of the EU (2006-2018), Marc was directly involved in 350 judgments, more than 70 of which were in the antitrust, cartel, abuse of dominance, merger, and State Aid domains. A majority of these cases set new precedents in these fields and involved fines or orders to recover between 200 million euros and several billion euros. 

As an attorney with Latham & Watkins (2002-2003) and with bureau Brandeis Paris that he co-founded (2020 to 2023), as well as the executive director of a claim aggregator (2018-2019), Marc focused on competition litigation and counseling. While Marc was involved in merger control at the start of his career, he has been instrumental over the past 5 years to the quick development of funded class actions in France and elsewhere on behalf of thousands of companies and public entities harmed by anticompetitive or deceptive practices.

Since 2010, Marc is a Lecturer in EU litigation, global competition litigation, cartel law, State aid law, class actions and litigation funding, including with the leading School of Law in France, Sciences Po Paris. He has also been a non-governmental advisor (NGA) for the European Commission, France and Luxembourg in the International Competition Network (ICN) since 2012. He is regularly invited to write, give interviews and speak throughout Europe on EU litigation, competition litigation, class actions and litigation funding matters. 


  • On-going class action in France on behalf of more than 150 companies and public entities against Diesel car manufacturers involved in the Dieselgate
  • On-going class action in France on behalf of more than 7,000 companies against the Meal Voucher issuers condemned for anticompetitive practices
  • Contributed to a class action on behalf of several hundred companies against the truck manufacturers involved in a cartel 
  • Handled over 30 leniency applications, 8 dawn raids, RFIs and interviews in three sectors, 1 SO and one decision in 3 Commission investigations
  • Handled 6 Merger notifications, including one Phase II
  • Drafted or contributed to 30 rulings in the antitrust and cartel field, 30 rulings in the State Aid field, 5 rulings in the abuse of dominance field, 5 rulings in the Merger field
  • Drafted or contributed to rulings in various fields such as liability of the EU, anti-dumping, regulated sectors, anti-dumping and subsidies, trademarks
  • Drafted legal opinions about litigation funding structures and class action regimes
  • Counseling clients in various EU domains


  • LL.M., Northwestern University (2002)
  • Master II in business and competition law, Montpellier University (1998)
  • Master I in business law, Panthéon-Sorbonne University (1997)


Paris, New-York


French, English, Italian and Spanish (passive)

Publications and speaking engagements

Speaking Engagements

  • Université de Dijon, Dijon, 28/03/2024 : Les juges de l’Union européenne et le sport : sens et portée des arrêts du 21 décembre 2023
  • Brown Rudnik Conference, Londres, 15/03/2024 : The state-of play of funding in Europe
  • Sommet du droit, Paris, 30/01/2024: Les entreprises françaises doivent-elles faire appel au financement de litiges ? 
  • Global Competition Litigation Circle, Ascot; 15/01/2024: Competition private enforcement in Europe (roundtables)
  • CCA & Leaders League, Lisbon, 23/03/2023: To fund or not to fund class actions 
  • ERA, Trier, 9 December 2022: ECJ’s 2022 Case-Law in Competition Private Enforcement 
  • Croatian Competition Agency, 25th anniversary international conference, Zagreb, 28/08/2022: Regulation 1/2003 and Private enforcement
  • ERA, Trier, 08/09/2022: Litigating complex cases before the EU General Court
  • Association des Etudiants M2 Marché & Régulation de Paris Assas, 16/12/2020: Quels droits pour les concurrents de bénéficiaires d’aides d’Etat illégales?
  • International Competition Network (ICN) webinar, 9/12/2020: Antitrust litigation costs and funding options 
  • EFB/Cercle Montesquieu, Paris, 5/11/2020: Actions en réparation antitrust 
  • ERA, Trier, 17/09/2020: Litigation before the Court of Justice of the European Union 
  • Informa Conference, London, webinar, 2/07/2020: State aids and private damages
  • IEB, competition seminar, Madrid, 31/01/2020: Damage claims and the concept of undertaking
  • ICN webinar, 11/12/2019: Development of Damage Claims in the EU
  • Cercle de la Compliance/ OECD, Paris, 10/12/2019: Droit de la concurrence en 2019 : principaux développements en Europe
  • Délégation des Barreaux de France (DBF), Bruxelles, 6/12/2019: Développements en matière de droit privé européen de la concurrence
  • ERA, Brussels, 27/09/2019, Training for Belgian judges in EU competition private enforcement law
  • Northwestern University, Paris, Hotel Lutetia 24/06/2019: Private enforcement of antitrust in Europe
  • 5th Lux Competition Day Conference, Luxembourg, 11/06/2019: Compensating Luxembourgish companies for their antitrust damage
  • Paris Court of Appeals/Concurrences, Paris, 28/03/2019: Statute of Limitations in Antitrust actions
  • ICN Webinar, Cartel workshop, 15/11/2018: Leniency 
  • Croatian Bar, Luxembourg – 3/05/2018: Direct Actions before the General Court
  • NYU-HEC Legal Clinic, Paris – 14/02/2018: Amicus Curiae before the EU Courts (Barennes)
  • 5th P. Sarcevic International Conference, Opatjia (Croatia) – 7/10/2017: Antitrust and Access to Documents (Barennes)
  • Concurrences & Mayer Brown, Paris – 28/02/2017: L’administration de la preuve en droit de la concurrence 
  • UNCTAD seminar, Luxembourg – 27/10/2016: Unlimited jurisdiction before the General Court in antitrust cases 
  • European Antitrust Academy, Berlin – 22/10/2015: The Commission’s settlement practice in cartel cases 
  • Amicale des référendaires, Luxembourg – 25/09/2015: Litigation funding: 
  • Paris Bar School (EFB) annual conference, Paris – 8/07/2015: Contentieux devant les juridictions de l’UE
  • 4th Petar Sarcevic International Conference, Croatia – 9/05/2015: The Leniency and the Settlement Programs of the EU Commission
  • Revue Concurrences & Baker Botts, Brussels – 25/09/2014: Developments in EU antitrust litigation: panelist
  • EIPA, Luxembourg – 29/11/2013: Recent trends in EU Competition case law
  • Revue Concurrences & Herbert Smith, Paris – 19/09/ 2013: Recours devant le Tribunal de l’Union contre les décisions de concurrence 
  • ICN Plenary session, Warsaw – 4/05/ 2013: The relationship between antitrust authorities and courts in competition cases: 
  • ICN Working Session, Paris – 26/11/2012: Courts and competition cases
  • ICN webinar, Madrid – 18/02/2014: Courts and competition cases 
  • AMCHAM (American Chamber of Commerce), Brussels – 9/11/2011: The standard of review of the EU Courts in competition law cases
  • ICC (International Chamber of Commerce) and Baker & McKenzie, Paris – 6/05/2006: The European Commission’s fight against cartels
  • Atelier de la DGCCRF, Paris – 6/12/2005 :  Premier Bilan de l’utilisation par les autorités de concurrence de leurs nouveaux instruments

Articles & blogs