Gildas de Muizon

Deloitte (Paris)
Partner, Head of Economic Advisory

Dr. Gildas de Muizon is a partner at Deloitte. He leads the Analytics, Value & Asset Advisory platform, which includes Forensic & Dispute Services, Economic Advisory, Valuation & Modeling and Real Estate Advisory. Prior to joining Deloitte in 2016, he was the managing partner of Microeconomix.

Gildas de Muizon is an expert in antitrust economics. He provides economic evidence and testimony in all competition matters (mergers, abuse of dominance, horizontal and vertical agreements, state aid, etc.).

He is more particularly specialized in the antitrust aspects of M&A clearance. He is regularly involved in some of the largest transactions on the market and has represented numerous clients before the European Commission and national competition authorities. In 2021, among others, he assisted Beaumanoir in the acquisition of Caroll, Veolia in the acquisition of Suez, Derichebourg in the acquisition of Ecore as well as Newrest in the acquisition of Sodexo Maroc. He has extensive experience of complex cases and “Phase II” merger investigations requiring the development of innovative approaches.

Gildas de Muizon has also wide experience estimating damages in both a competition and a commercial litigation context. He has worked on significant follow-on actions in cartel as well as abuse of dominant position cases. He regularly testifies before French courts. Since 2015, he has been listed as a court-appointed expert (“expert judiciaire”) by the Paris Court of Appeal.

Gildas de Muizon holds a Master’s degree in science & executive engineering from Mines ParisTech and a PhD in economics from the University of Paris X.

Linked authors

Deloitte (Bucharest)
Deloitte (Paris)
Deloitte (Paris)
Deloitte (Paris)
University of Wollongong


Speakers' Video interview: Dominique Gilles (Paris Court of Appeal), by Gildas de Muizon (Deloitte)
Gildas de Muizon 19 June 2020 Webinar
Gildas de Muizon - Transposition de la directive Dommages - 10 mars 2017
Gildas de Muizon 10 March 2017 Paris


47 Bulletin

Gildas de Muizon, Ariane Charpin The French Competition Authority clears merger of 2 fast food restaurant chains, subject to divestitures in a local market (Quick / Burger King France)


The operation notified to the French Competition Authority (FCA) consists in the acquisition of the firm Quick by the firm Burger King France. Burger King and Quick are two fast-food restaurant chains selling hamburgers. The purpose of the operation is to turn 300 Quick restaurants located in (...)

12090 Review

Bruno Lasserre, François Lévêque, Françoise Benhamou, Frédéric Jenny, Gildas de Muizon, Harry First, Mario Siragusa, Olivier Fréget, Thibaud Simphal Disruptive innovation, law and competition (Paris, 29 January 2016)


Innovation today is shifting the established positions of a growing number of companies and industries. There is no shortage of qualifiers to underline the power of this phenomenon: drastic innovation, destabilising innovation, disruptive innovation, radical innovation, disruptive innovation. (...)

Gildas de Muizon Economic proof in anticompetitive practices’ detection


Different tests have been proposed by the economic literature and used by competition authorities in order to detect anticompetitive conducts. No single test is suitable for every type of practice and the economic theory can help in choosing the most relevant one. I. A middle way between the (...)

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