Weyer VerLoren van Themaat

Weyer VerLoren van Themaat

Advocaat | Partner


+31 20 605 61 83
+31 6 5365 5833



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Weyer specialises in competition law and leads Houthoff’s Competition practice group. He is also head of Houthoff’s Healthcare sector group. Weyer focuses in particular on merger notifications and cartel defence litigation. His work involves issues relating to regulation and competition in healthcare, and advising and assisting healthcare institutions in the context of partnerships.

Weyer represented T-Mobile Nederland in the ‘mobile operators case’ brought by the Netherlands Competition Authority, which eventually resulted in the seminal ‘T-Mobile case’ at the European Court of Justice on the definitions of object and effect in the context of internal market restriction. He also represented Accell Groep, the second largest bicycle manufacturer in Europe, in an appeal against a decision of the Netherlands Competition Authority regarding alleged mutually agreed concerted practices in the form of information exchange. In relation to merger control, he was involved in the EU notification of TomTom’s takeover of TeleAtlas. In relation to healthcare, he assisted the mergers of the ErasmusMC and Havenziekenhuis, the St. Elisabeth Hospital and TweeSteden Hospital, the Kennemer Gasthuis and Spaarne Hospital, and the AMC and VUmc.

  • “He is practical and has so much experience he is on top of the subject. He always approaches difficult topics in a positive manner and we have very open communication with each other.”
    Chambers Europe, Competition / European Law (2019 Edition)
  • “According to interviewees, ‘he is an authority in the field’ who gives ‘trustworthy advice.’”
    Chambers Europe, Healthcare (2019 Edition)
  • Recommended
    Legal 500, EU and Competition (2019 Edition)
  • Recommended
    Legal 500, Healthcare and Life Sciences (2019 Edition)
  • "Sources are impressed with his 'strategic and technical knowledge'."
    Chambers Europe, Healthcare (2018 Edition)
  • "He draws praise from sources, who describe him as an 'excellent boardroom adviser' who 'builds a genuine team relationship' with the client. Clients also appreciate his 'personal touch and sense of humour'."
    Chambers Europe, Competition/ European Law (2018 Edition)
  • Recommended
    Legal 500, Healthcare and Life Sciences (2018 Edition)
  • Recommended
    Legal 500, EU and Competition (2018 Edition)
  • "Department head Weyer VerLoren van Themaat is 'Well-respected'." 
    Legal 500, EU and Competition (2018 Edition)
  • "‘Steadfast, well-connected’ competition expert Weyer VerLoren van Themaat has ‘extensive sector knowledge’."
    Legal 500, Healthcare and Life Sciences (2018 Edition)
  • "He's very experienced in the Dutch competition sphere and has a good relationship with the Dutch competition authorities. We have been very happy with his advice so far; he's very insightful in meetings." 
    Chambers Europe, Competition/European Law (2017 Edition)
  • "Weyer VerLoren van Themaat is a highly regarded practitioner handling cartel defence litigation and merger control proceedings for multi-jurisdictional clients."
    Chambers Europe, Competition/European Law (2017 Edition)
  • "The ‘smart, strategic’ Weyer VerLoren van Themaat heads Houthoff Buruma’s multidisciplinary practice."
    Legal 500, Healthcare and Life Sciences (2017 Edition)
  • "Weyer VerLoren van Themaat is ‘smart and strategic’."
    Legal 500, EU and Competition (2017 Edition)

Weyer was a resident partner of the Brussels office from 1997 to 2005. He is a member of the International Bar Association, the ABA, the Dutch Competition Law Association and the Dutch Association for European Law. He is also Chair-Emeritus of Lex Mundi's Antitrust, Competition and Trade group; non-governmental advisor of the Dutch Authority for Consumers and Markets; and chair of the advisory committee of the Netherlands Bar Association. Weyer is the founder and a board member of the competition law foundation Stichting Ontwikkelingen Mededingingsrecht, and has authored and co-authored various books on competition law, including European Competition Law (Edward Elgar) and Nederlands Mededingingsrecht (Kluwer). 

  • Houthoff assisted the AMC and VUmc hospitals in obtaining the required approval from the Netherlands Authority for Consumers & Markets (ACM) for an administrative merger. The approval enables the two Amsterdam-based university medical centres to cooperate on patient care, research, education and training without limitation. This will create the biggest university medical centre in the Netherlands.
  • Houthoff is representing Singapore Airlines Singapore Cargo in various Dutch private enforcement proceedings before the Amsterdam courts. These proceedings were initiated by claim vehicles Equilib, EWD and Stichting Cartel Compensation (SCC) following the EC's decisions in the air cargo case. The first action was initiated in 2010 and all the cases are ongoing. In the past seven years, many procedural issues have been raised: a suspension until a final EU judgment has been given, the disclosure of the EU decision (which was rejected in March 2014), the disclosure of air waybills, the assignment of claims, and applicable law. More substantive issues are likely to be discussed in Q4 of 2017 or in the course 2018.
  • Advising on the governance of Martini Ziekenhuis and its Medical Specialists, including advice on the legal structure and setting up cooperation agreements between the Medical Specialists and the Board of the Hospital.
  • Representing Total in a follow-on damage claim.
  • Medical Centers of Amsterdam, Academisch Medisch Centrum and VUmc, in an unprecedented merger case, to obtain merger clearances from the Dutch competition authority and the Dutch health care authority. The merger would combine a total of ~15.000 health care practitioners, researchers and teachers into the largest academic medical centre of the Netherlands, and one of the largest in Europe. The merger inter alia requires the split off of Vumc from the Free University of Amsterdam.
    A particular feature of the merger is that it is based on an integration of the boards of the public legal entity AMC and the private legal entity VUmc. As the Minister of Education, Culture & Science appoints the supervisory board of AMC, an unprecedented governance structure was designed to guarantee both an integrated supervisory and executive between AMC and VUmc and sufficient independence from the Minister for the medical centers.
  • Assisted the two Amsterdam university hospitals, AMC and VUmc, in obtaining regulatory approval for their anticipated merger from the Dutch health care authority, NZa. The NZa granted its approval on July 14. Following this approval from the NZa, the university hospitals will notify their intended transaction to the Dutch competition authority ACM.

Qualifications & Experience

  • Law (University of Amsterdam)