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Stefan Tuinenga is a founding partner of the firm. He has more than fifteen years of antitrust litigation experience. He primarily focuses on international antitrust litigation and collective actions.

Before starting the firm, Stefan founded the Dutch office of another leading international plaintiff firm. Stefan previously worked for a large tier 1 defence firm in Amsterdam, acting in many of the leading antitrust litigation cases in Europe. He also helped to establish the Fair Trade Authority of Curaçao, where he served as a director, and he worked as in-house legal counsel for a major airline, where he was responsible for worldwide competition and anti-bribery compliance.

Stefan regularly publishes articles on developments in competition law and litigation in the Journal of European Competition Law & Practice and the Dutch competition journals Markt & Mededinging and Mededingingsrecht in de Praktijk. Stefan is a non-governmental advisor to Curaçao in the International Competition Network.

Representative cases

Represented a foundation in an abuse of dominance claim on behalf of European consumers against a major technology company, with a damages claim of almost EUR 5 billion.

Represented the Take Back Your Privacy Foundation in a class action claim against TikTok for infringement of privacy rights of Dutch children.

Represented eight multinational companies in cartel damages claims against truck manufacturers.

Represented four utility companies in a cartel damages claim involving the worldwide power cables cartel.

Represented corporate clients in pursuing a cartel damages claim in connection with a cardboard and paper cartel.

Represented a multinational airline in the air cargo follow-on civil damages cases.

Representing the Fair Trade Authority of Curaçao (FTAC) in their first-ever competition law fine case.

Represented corporate clients in multiple competition law investigations by the European Commission and the Dutch competition authority, including in the air cargo, telecommunications, insulated glass, flour, and retail food packaging sector, as well as in internal investigations.

Represented immunity and leniency applicants in various cartel investigations and led discussions with authorities concerning access to documents and confidentiality.

Stefan Tuinenga has registered the following principal (and secondary) legal practice areas in the Netherlands Bar’s register of legal practice areas (rechtsgebiedenregister):

– Litigation (Burgerlijk procesrecht, subrechtsgebied litigation)
– Competition law (Economisch ordeningsrecht, subrechtsgebied mededingingsrecht)

Based on this registration, he/she 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.