David Sevy

"David is one of the best economists on the market. Very knowledgeable and hands on." - Lexology Index 2025

David Sevy is an Executive Vice President with Compass Lexecon and heads the Paris office.

David has over 20 years of experience advising clients in high-profile competition and litigation matters and has worked as expert in more than two hundred cases in a broad variety of sectors (including consumer goods, digital, retailing, media, transportation, automotive, aeronautics, healthcare, telecommunications, energy, and financial services).

David has advised clients in many complex matters, including a large number of Phase II merger proceedings, before the European Commission and national competition authorities (France, Belgium, UK, Switzerland, Malta, Romania). Recent merger experience involves EC Phase II cases Orange/MasMovil, Orange/Voo/Brutélé, Fiat Chrysler/Peugeot, Siemens/Alstom, Thales/Gemalto, Wabtec/Faiveley, Liberty Global/Base, as well as Phase I cases Hitachi Rail/Thales, Orange/TKR and Safran/Zodiac; it also involves Phase II cases TF1/M6, Ardian/SPMR, Cofigeo/William Saurin and FNAC/Darty before the French NCA.

David has advised clients in numerous antitrust cases before the European Commission (Art. 101 cases re: Natural gas, Power Cables, Euribor, CDS, SSA Bonds, retailing as well as in Art. 102 in industrial products, telecommunications, financial services) and before national authorities. David has also acted as economic and testifying expert in many large commercial litigations (before French and German commercial courts in particular) and international arbitration cases (under ICC, ICSID and LCIA), as well as in WTO cases.

David is listed as a Global Elite Thought Leader in the Lexology Index of Competition Economists and is also featured in the Lexology Index of Arbitration Expert Witnesses.

He is Non-Governmental Advisor for the French competition authority in the International Competition Network.

David graduated from Ecole Polytechnique (1986) and received his Ph.D. in Economics from Ecole Polytechnique (1993). After a post-doc at AT&T Bell Laboratories (1994), David worked for France Télécom (1994–1999) as senior regulatory economist. He then joined McKinsey & Company in Paris, from 1999–2002.

David´s academic research focused mainly on theoretical and applied industrial economics. He is adjunct professor of economics at Ecole Polytechnique, teaching antitrust economics. David is co-author of the textbook Economie de l’entreprise, aux Editions de l’Ecole Polytechnique and is a frequent speaker in competition policy conferences.

"He has a very robust and long experience. He is an excellent economist and he also has a strong team with him." - Lexology Index 2025

"Top skills, always available and high level work delivered. Very imaginative, always a pragmatic approach and a real sense of what could be developed to win the case." - Lexology Index 2025

"He is not only a brilliant mind, he is also one of the not many economists able to explain complex economic concepts in a simple and intelligible way. He is very persuasive, always calm and clear, a true pleasure to work with." - Lexology Index 2025

"He is extremely bright, clear in his demonstrations, convincing in his advocacy. Intelligence, rapidity, clarity, strong reputation." - Lexology Index 2025

"Immense experience. Deep expertise in all competition fields. One of the best competition economists in Europe." - Lexology Index 2024

"Precision, sense of strategy. Excellent knowledge of competition economics and business savvy." - Lexology Index 2024

"Always clear and accurate. Great knowledge of his topic and always the good response to address the issue." - Lexology Index 2024

"Very good on the substance, pleasant to work with." - Lexology Index 2024

"Heads a great team, everyone pulling in the same direction. When you hear him he sounds objective which is a strength." - Lexology Index 2024

"He is very good." - Lexology Index 2025

"Has the ability to analyse a very complex dossier and produce quality results under pressure and to tight deadlines." - Lexology Index 2024

"Knows what he's talking about, accurate, understands the business and legal side of things and what's possible and what's helpful in that context." - Lexology Index 2024

"Efficiency, thoughtfulness, ability to make and explain judgment calls." - Lexology Index 2024

"Highly experienced with the capacity to understand complex market." - Lexology Index 2024