Amaryllis Müller
Counsel
Amaryllis Müller’s practice covers all aspects of European and Belgian competition law, with a focus on the Digital Markets Act, cross-border merger control, abuse of dominance proceedings, cartel investigations and antitrust 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.
Her experience crosses a range of industry sectors with a focus on technology and telecommunications.
Amaryllis joined the firm as counsel in 2025 after serving as senior antitrust counsel in the Brussels office of a major social media company for two years. During this time, she gained significant in-house experience advising on global antitrust matters, including compliance with digital regulation and day-to-day product counseling. Previously she worked at another international law firm in Brussels for nearly 10 years, including a 10-month secondment to their Washington, D.C. office.
Notable Experience
Prior to joining Cleary, Amaryllis’ notable experience included:
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ByteDance on its Digital Markets Act notifications, compliance measures and appeals to the General Court and Court of Justice (as in-house counsel).
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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, and the further appeal to the Court of Justice.
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Tech clients on confidential antitrust mandates, as well as industrial clients on the antitrust aspects of digital transformation.
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Anheuser-Busch InBev in its defense of a high-profile investigation by the European Commission into alleged abuse of dominance on the Belgian beer market relating to parallel trade with neighboring countries, which resulted in a novel cooperation decision.
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ThyssenKrupp in the damages litigation brought by the European Commission before Belgian Courts following the Commission’s decision imposing fines on four elevator companies for bid-rigging, which led to successful rulings denying all damages claims.
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Cengage Learning on the global merger control process, including a U.S. DOJ Second Request of its proposed merger with McGraw-Hill Education, Inc.
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Novartis on its joint venture with GlaxoSmithKline Consumer Health and on the $5 billion auction sale of its Animal Health business to Eli Lilly.
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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.
Publications
Standing still or jumping the gun: lessons from the Altice Judgment, IJEL 2022
The Telenor Case: The (In)compatibility of Zero-rating with the Net Neutrality Principle (C-807/18 and C-39/19 Telenor Magyarország), CoRe 2021
Wat verandert er met de omzetting van de richtlijn schadevorderingen in België? - Een blik uit de praktijk, Competitio 2018
Morningstar v Commission – Setting the Bar High for Third Parties Challenging EU Commitment Decisions, CPI 2016
‘Umbrella claims’ voortaan onder paraplu Europees mededingingsrecht, Juristenkrant 2014
Events
July 9, 2024
GCR Live: Law Leaders Europe 2024
June 19, 2024
The Real Impact of the DMA
May 22, 2024
ByteDance DMA Compliance Workshop
March 5, 2024
ABA International Women’s Day Event