Costanza Mussi

Counsel, Paris, Milan



Costanza Mussi is counsel in the Competition, EU Law and Economic Regulation practice of White & Case in Paris. Costanza represents and assists clients in relation to anti-competitive practices, merger control, commercial and administrative litigation, as well as distribution and consumer law.

Before joining White & Case in 2016, Costanza was an associate in the Paris office of a major French law firm.

Bars and Courts
Master 2 (MA equivalent), International Trade Law
Université Paris X-Nanterre
Master's Degree
International and EU Law
Université Paris X-Nanterre
General Law Degree
Pisa University


Representing a major manufacturer in proceedings before the French Competition Authority relating to alleged anticompetitive practices in the agri-food sector.*

Representing Casino Guichard-Perrachon, a very significant French food retail group, on the acquisition of the entire share capital and voting rights of Monoprix SA one of the largest supermarket chains in France, and the subsequent filing of the transaction before the French Competition Authority which opened a Phase 2 examination.*

Representing Michelin on the competitive aspects of the creation of a joint venture with Fives, aimed at developing and marketing industrial machines and production shops using the metal 3D printing technology. This transaction was simultaneously filed in other countries: China, Brazil, Korea, Türkiye and Serbia.*

Representing an IT services company in litigations against the French General Directorate for Competition Policy, Consumer Affairs and Fraud Control (DGCCRF) related to alleged infringements to the French Commercial Code.*

Representing a major IT operator in a litigation concerning alleged misleading practices.*

*Experience prior to joining White & Case in 2016.


La Commission peut rejeter une plainte au motif qu'une autorité nationale de concurrence traite déjà l'affaire, AJ Contrats d'affaires - Concurrence - Distribution (Dalloz), n°3, March 2015, p. 134-135