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Jean-Francois Willems
Of Counsel

Jean-Francois Willems

Languages
  • French
  • English

Jean-Francois Willems is Of Counsel in the Antitrust, Competition and Trade Team at CMS London.

Jean-Francois specialises in EU and UK competition law and has significant experience advising clients on EU, UK and multi-jurisdictional merger and FDI filings, as well as EU and UK cartel investigations. He also advises clients on a regular basis on competition law aspects of their commercial arrangements and compliance programmes. 

He is qualified in the EU and the UK, and worked for several years in Brussels. Prior to joining CMS he worked at a prominent international law firm for more than 15 years. Jean-Francois also gained in-house experience, through secondments with the competition team of Novartis at their Basel head office and with the Paris-based competition team of TotalEnergies. 

Relevant experience

  • Refinitiv and shareholder Blackstone on the acquisition of Refinitiv by the London Stock Exchange Group for USD 27bn.
  • GitHub in relation to the EC review of its USD7.5bn acquisition by Microsoft.
  • Total on its USD 1.5bn acquisition of part of the ENGIE LNG business.
  • Asahi on the EC review and purchaser approval of its acquisition of the SABMiller CEE business from Anheuser Busch for EUR 7.3bn.
  • Cargill in relation to the acquisition of the industrial chocolate business of Archer Daniels Midland.
  • Huntsman on the USD1bn acquisition of the titanium dioxide business of Rockwood Holdings.
  • Novartis in relation to its USD 38.5bn acquisition of eye care products manufacturer Alcon.
  • A large financial institution in relation to a CMA investigation into potential anti-competitive arrangements in the financial services sector.
  • A large financial institution in relation to the EC investigation regarding the secondary trading market of Supra-sovereign, Sovereign and Agency bonds denominated in US Dollars.
  • Novartis’ subsidiary Sandoz in relation to the EC investigation into an alleged agreement to delay market entry of generic pain-killer fentanyl.
  • A major multinational manufacturer of mass-consumer goods in the EC cartel investigation against producers of consumer detergents.

The above matters were handled prior to joining CMS.

Education

  • 2008 - LL.M Columbia University, New York.
  • 2006 - LL.M in European Law, Université Libre de Bruxelles, Belgium.
  • 2005 - Masters in Law, Université Catholique de Louvain, Belgium.

Insights by Jean-Francois

CMS advises Aviva Investors and Truespeed Communications Group Limited on merger of fibre broadband providers

16 Feb 2026 2 min read

CMA issues new guidance setting out how competition law applies in labour markets

24 Oct 2025 6 min read

CMS advises SEFE on all aspects of acquiring WIGA Group

26 Mar 2024 5 min read

CMS advises HICL on £204m portfolio disposal

04 Oct 2023 2 min read
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