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Guillaume Blanc has experience in all aspects of European and French competition law. His practice focuses on antitrust, merger control, and state aid counseling and litigation across a wide range of sectors, including technology, media, telecommunications, energy, and transport. He also assists clients on other aspects of EU law such as regulatory and internal market issues.

Guillaume regularly advises clients on European and French restrictive practices and distribution law, particularly when setting up distribution contracts and drafting or reviewing terms and conditions, and on consumer law.

Prior to joining Jones Day, Guillaume worked in the Paris and Brussels offices of two leading law firms and at the French Prime Minister's office (EU affairs division) and at the Court of Justice of the European Union in Luxembourg.


  • EDF obtains first-ever approval under new state aid framework for RDIJones Day advised Electricité de France S.A. ("EDF") in securing the European Commission's approval of €50 million in State aid from the French State to support R&D activities in the field of Small Modular Reactors ("SMRs").
  • T-Mobile closes European Commission investigation into network sharing with commitmentsJones Day represented T-Mobile Czech Republic a.s. in an investigation launched by the European Commission in 2016 in relation to the mobile network sharing agreements concluded between T-Mobile and its competitor CETIN/O2, in the Czech Republic.
  • EDF and Veolia create joint ventureJones Day acted as antitrust counsel to EDF in the formation of Waste2Glass, a 50/50 joint venture with Veolia that develops innovative radioactive waste treatment solutions based on Veolia's Geomelt® vitrification technology.
  • Teréga successfully navigates European Commission's first State aid investigation of regulatory mechanism for storage of natural gasJones Day advised French gas storage operator Teréga SA in successfully navigating the European Commission's in-depth investigation into whether the French regulation mechanism for natural gas storage complied with EU State aid rules.
  • Bombardier sells transportation business to Alstom for €6.2 billionJones Day served as antitrust and French corporate counsel in the €6.2 billion sale of Bombardier Inc.'s transportation business to Alstom S.A.
  • STERIS acquires Key Surgical for approximately $850 millionJones Day advised STERIS plc (NYSE: STE) in the $850 million acquisition of Key Surgical, a leading global provider of sterile processing, operating room, and endoscopy products, and a portfolio company of Water Street Healthcare Partners, LLC.
  • NVIDIA acquires Mellanox Technologies for approximately $7 billionJones Day advised NVIDIA Corporation in its acquisition of Mellanox Technologies, Ltd., an Israel-based leading supplier of end-to-end InfiniBand and Ethernet interconnect solutions and services for servers and storage.
  • Additional Publications

    Publications Prior to Jones Day

    Septembre 2018

    Guillaume Blanc, Adrien Giraud, Les mesures conservatoires à la française : un modèle réellement enviable ?, Septembre 2018, Concurrences Review N° 3-2018, Art. N° 87235