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Sébastien Champagne heads the Firm's Global Disputes team in Brussels and focuses on domestic and cross-border litigation related to commercial, trade practice, product liability, regulatory, competition, and private disputes. He is the administrative partner for the Brussels Office.

Sébastien regularly represents and advises major national and international corporations in pretrial negotiations and in litigation before judicial and administrative courts. His clients are active in various sectors, including the telecom, engineering and supply of industrial equipment, IT, automotive, and pharmaceutical industries. Notably, he assisted telecoms operator, Base Company, in successfully resolving its abuse of dominance complaint against Belgium's incumbent operator, reaching a landmark settlement in 2015 for a total of €120 million in the wake of a favorable judgment issued by the Brussels Court of Appeal in February 2015.

He is also a member of Jones Day's Investigations & White Collar Defense Practice. He advises clients in internal compliance and Foreign Corrupt Practices Act (FCPA)-related investigations.

Sébastien is also experienced in the drafting and negotiation of commercial and telecom-related agreements.

Sébastien serves as a deputy judge at the Commercial Court of Brussels. He also serves as both arbitrator and counsel for international arbitration bodies. In addition, Sébastien is a lecturer for the Brussels Bar in the field of civil procedure.


  • MasterCard defeats UK litigation claim regarding interchange fees for payment card transactionsJones Day client MasterCard Incorporated has defeated a lawsuit brought by various UK retailers seeking £450m in damages for losses allegedly suffered as the result of MasterCard's arrangements for setting default interchange fees on payment transactions.
  • BLACKB sells Darts-ip to Clarivate AnalyticsJones Day represented the various shareholders of BLACKB in the sale of all their shares to the Belgian subsidiary of the U.S. listed company Clarivate Analytics (US) LLC.
  • MasterCard resolves private enforcement claim surrounding allegations of excessive interchange feesJones Day represented MasterCard International in a private enforcement case initiated by Delhaize in relation to allegedly excessive interchange fees.
  • Sagevas, World Football Association, and Belgische PMU pursue successful abuse of dominance complaint against Belgian National LotteryOn behalf of Sagevas SA, the World Football Association, and Belgische PMU, Jones Day filed a complaint with the Belgian Competition Authority against the Belgian National Lottery for abusing its dominant position in the national sports betting market during the commercial launch of its sports betting product Scooore!
  • BASE Company successfully resolves abuse of dominance complaint brought against ProximusJones Day represented BASE Company in a damage claim for abuse of dominant position against Proximus NV, the Belgian mobile incumbent operator.
  • BASE obtains favorable decision in claim against Belgacom Mobile for abuse of dominant positionOn behalf of Dutch-based telecommunications operator KPN and its subsidiary BASE, Jones Day challenged abuses by Belgacom Group of its dominant position, which had radically distorted the competitive environment in the Belgian telecommunications market.
  • Telecom company defends against breach of contract claimsJones Day represented a telecom company in an ICC arbitration commenced against it by another telecom company for alleged breach of contract related to roaming services.