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About Amaryllis Müller

Amaryllis is a principal associate in our antitrust group based in the Brussels office.

Her practice covers all aspects of European and Belgian competition law, with a focus on cross-border merger control, abuse of dominance proceedings and cartel litigation including follow-on damages claims.

Amaryllis also advises on State aid and  EU and Belgian regulatory law. She has represented clients in multiple cases before the European and Belgian authorities and courts. During a 10-month secondment in our Washington, DC office Amaryllis gained insights into US merger control. She also expanded her experience of in-house priorities and challenges during a client secondment.

Amaryllis' experience crosses a range of industry sectors with a focus on telecommunications, media and technology. She serves as lead antitrust associate for the Brussels TMT sector group.

Amaryllis speaks Dutch, English, French and German.

Recent work

  • CK Hutchison on its attempted acquisition of O2 UK and the subsequent landmark appeal before Europe’s General Court, which overturned the European Commission’s prohibition decision.
  • Tech clients on confidential antitrust mandates, as well as industrial clients on the antitrust aspects of digital transformation.
  • Anheuser-Busch InBev in its defence of a high-profile investigation by the European Commission into alleged abuse of dominance on the Belgian beer market relating to parallel trade with neighbouring countries, which resulted in a novel cooperation decision.
  • ThyssenKrupp in the damages litigation brought by the European Commission following the Commission’s decision imposing fines on four elevator companies for bid-rigging. 
  • Cengage Learning on the global merger control process, including a US DoJ Second Request, of its proposed merger with McGraw-Hill Education, Inc.
  • Novartis on its joint venture with GlaxoSmithKline Consumer Health and on the $5bn auction sale of its Animal Health business to Eli Lilly.
  • Holcim Belgium in its successful appeal before Belgium’s Court of Appeal challenging the Belgian Competition Authority’s cartel decision in the cement sector, which led to a significant ruling quashing all cartel allegations.


  • Harvard Law School, US (LLM): 2019
  • Member of the Brussels Bar: 2013
  • LL.M., College of Europe, Bruges (mention très bien): 2013
  • Master of Law, University of Leuven (summa cum laude): 2012
  • Visiting student, Humboldt University Berlin: 2011