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Stefan Tuinenga has more than a decade of dispute resolution and competition law experience: in private practice, as in-house counsel and by working for a competition authority. He is primarily focused on international antitrust litigation and collective actions.


  • Worked eight years for a large first tier firm in Amsterdam, acting in many of the leading antitrust litigation cases such as air cargo, wire steel and gas insulated switchgear;
  • Acted in multiple competiton law investigations by the European Commission and the Dutch competition authority, among others in the air cargo, telecommunications, insulated glass, flour and retail food packaging sector, as well as in internal investigations;
  • Involved in various immunity and leniency applications, settlements, contested cases and discussions about access to documents and confidentiality. Thus has an in-depth understanding of the interplay between public enforcement and private damages actions.


  • Admitted to practice law in The Netherlands


  • University of Groningen, International and European law (LL.B and LL.M, with a LL.M exchange to McGill University), 2008
  • International Business & Management (BSc), 2008

On the basis of the registration it is required  to obtain ten training credits per calendar year in each registered principal legal practice area in accordance with the standards set by the Netherlands Bar.

  • Litigation (Burgerlijk procesrecht, subrechtsgebied litigation)
  • Competition law (Economisch ordeningsrecht, subrechtsgebied mededingingsrecht)
  • Law Firm School (post-graduate law school, with honours)


  • Was on a secondment basis responsible for worldwide competition law and anti-bribery compliance at KLM Royal Dutch Airlines in 2014;
  • Stood at the foundation of the competition authority of Curaçao as director and legal counsel of the Fair Trade Authority Curaçao in 2017-2019, of which he is now a non-governmental advisor;
  • Coordinating lecturer for the competition law course for students and legal professionals of the University of Curaçao in 2018 and 2019;
  • Regularly publishes articles on developments in competition law and (antitrust) litigation, such as the overview articles on actions for damages in the Netherlands, the United Kingdom, and Germany in the Journal of European Competition Law & Practice for the year 2015 and 2017 (coordinating author);
  • Is passionate about triathlons – has completed three Ironman’s (70.3 and 140.6) in the past year.