Guillaume Duquesne

Senior Vice President

Paris | Brussels

Guillaume Duquesne is a Senior Vice President at Compass Lexecon, based in Paris and Brussels. Since joining in 2013, Guillaume has advised clients on a wide variety of competition policy issues, covering sectors as diverse as energy, financial, high technologies and digital sectors. Guillaume has advised clients in global merger or antitrust cases at the European Commission level and at the level of the French competition authorities.

Some of his recent work includes advising on the competitive effects of high-profile mergers, including several recent Phase II merger cases before the European Commission: Broadcom/VMware, Arm/Nvidia, Google/Fitbit, Siemens/Alstom, E.ON/Innogy, Deutsche Börse/LSE and EDF/Areva. It also includes advising on investigations of the European commission in the financial industry (SSA Bonds, Libor, Euribor and CDS) and advising some of the largest big tech companies in antitrust cases and litigations.

Guillaume authors various papers and book chapters on revision of vertical guidelines, tech mergers, big tech banking and digital markets.

Prior to joining Compass Lexecon, Guillaume worked as a quantitative analyst for Crédit Agricole – Corporate Investment Bank.

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. Guillaume has held various research/teaching assistant positions.

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    • MSc in Analysis and Policy in Economics, Paris School of Economics
    • MSc in Probability and Finance, Université Pierre et Marie Curie
    • MSc in Applied Mathematics, Ecole Normale Supérieure

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