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Portrait ofMarie Vandenneucker

Marie Vandenneucker


CMS DeBacker
Chaussée de La Hulpe 178
1170 Brussels
Languages French, Dutch, English

Marie specializes in European and Belgian competition law (abuse of dominant position, cartels and merger control), as well as European State aid rules. During her studies, she developed a high interest in competition law in the digital age and she wrote her thesis on the impacts of pricing algorithms on collusion.

Her practice includes the preparation and submission of notifications to the European Commission of public interventions, aid schemes (energy, SGEI, etc.) and merger projects, the representation of companies before the European Commission and the Belgian Competition Authority and advising public authorities on the compliance of their actions with applicable European law.

She is particularly active in the telecom and energy sectors.

Marie graduated with a Bachelor’s degree in law from UNamur (2016), a Master’s degree in law from KU Leuven (2018) and an LL.M. in European competition law from the University of Edinburgh (2019). 

She handles cases in French, Dutch and English.

She joined CMS in 2019.

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  • M. VANDENNEUCKER & A. LEPIECE, « State aid in the energy sector », CMS Expert Guide for State Aid, 29 June 2023, available here;
  • M. VANDENNEUCKER & A. LEPIECE, « Arrêt Sumal : responsabilité civile d’une filiale en raison des pratiques anticoncurrentielles de sa société mère », JDE, February 2022, n° 286, p. 60;
  • M. VANDENNEUCKER & A. LEPIECE, « Arrêt « Volvo » : compétence en matière d’action en réparation du dommage causé par une infraction à l’article 101 TFUE », JDE, December 2021, n° 284, p. 468;
  • M. VANDENNEUCKER & A. LEPIECE, « Le cadre européen applicable aux aides d’Etat dans le contexte de la crise du COVID-19 », Revue de Droit commercial, December 2020; 
  • M. VANDENNEUCKER & A. LEPIECE, « Arrêt Otis : l’action en réparation pour toute personne ayant subi un préjudice indirect à la suite d’un cartel », JDE,  April 2020, n° 268, p. 167;
  • M. VANDENNEUCKER & R. ALDERWEIRELDT, « Google: the record fine », Competition Law Insight, 19 November 2019.
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Lectures list

  • « New state aid rules to support the Green Deal – the EU’s answer to the IRA», CMS EU Competition Law Briefing, 28 April 2023.
  • « Guide pratique des règles d'aides d'État applicables aux investissements de décarbonation des aéroports – Cadre juridique », with Annabelle Lepièce, UAF&FA and Oxera, 23 January 2023.
  • « Exchange of strategic information between competitors: do’s and don’ts », CMS training, with Annabelle Lepièce, 24 March 2022.
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  • 2019 - Bar Admission (Brussels, Belgium)
  • 2019 - The University of Edinburgh, UoE - Scotland (LL.M. in Law focusing on European Competition Law)
  • 2018 - The University of Sheffield - United Kingdom (Erasmus)
  • 2018 - Katholieke Universiteit Leuven, KU Leuven - Belgium (Master of Laws)
  • 2016 - Universiteit Antwerpen, UA (Erasmus Belgica)
  • 2016 - Université de Namur, UNamur (Bachelor in Laws) 
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