Guillaume is a Partner at Econic Partners based in Brussels and Paris. Previously, he spent over ten years at Compass Lexecon, where he last served as a Senior Vice President in the EMEA competition practice.
Guillaume extensive experience advising clients on competition policy issues across a wide range of sectors including energy, financial services, technology and digital markets. Guillaume’s advisory work on mergers, antitrust and litigation spans across high-profile global, European and French matters before the European Commission and French competition authority. He has also advised clients and regulators on the impact of regulatory changes in the digital and energy sectors.
Guillaume’s recent work includes advising clients in high-profile mergers such as IBM/HashiCorp, Nvidia/Run:ai, Broadcom/VMware, Arm/Nvidia, Google/Fitbit, Bombardier/Alstom, E.ON/Innogy, Deutsche Börse/LSE and EDF/Areva. He has also advised on notable antitrust cases and litigation in the financial sector (SSA bonds, Libor, Euribor, CDS, multilateral interchange fees) and digital/tech sector (app store, app tracking, new copyrights, cloud gaming, collaboration tools, data protection). In addition, he has advised on the first no-poach investigation and the trucks litigation in France.
Guillaume is recognized by Global Competition Review’s ‘40 under 40’ as one of the leading antitrust practitioners of the next generation, as well as listed in Lexology’s Competition Economics index.
Guillaume graduated the Ecole Normale Supérieure where he specialized in economics, mathematics and finance. Guillaume holds an M.Sc. in Economics from the Paris School of Economics and an M.Sc. in Quantitative Finance from Pierre and Marie Curie University, both with highest honours.