Marc specialises in EU law and competition law (merger control, anti-trust and state aid). He has broad experience in proceedings before the European and Dutch courts, the European Commission and the Dutch Competition Authority. He has also assisted clients in complex cartel damages proceedings and has been involved in various important state aid matters. Marc is editor of the Tijdschrift voor Staatssteun (a State aid journal). 

Marc is a member of the Loyens & Loeff Competition Litigation Team. He also is a member of the Netherlands Association for European Law and the Netherlands Association for Competition Law. He has published various articles on competition law and is a regular speaker at conferences.

Sectors & Markets
Branding icon


French language and literature, Radboud University Nijmegen, 1987
Studies in the field of international and EU law, LUISS University Rome, 1991/1992
Dutch law, Radboud University Nijmegen, 1992
Grotius Academy corporate law, 1996

What others say

Quote icon
"Marc Custers understands our business, advice is practical, concrete and to the point."
Legal 500 (2021)
Quote icon
Marc Custers assists with merger clearances before the ACM and state aid issues. Clients endorse his user-friendly style, one saying that "it is always a pleasure to work with him," and adding: "He is a very amicable person." His client list encompasses municipalities, insurers and private equity firms.
Chambers Europe (2021)
Quote icon
"Marc Custers is best known for representing clients in cartel cases. He also regularly advises clients on all aspects of merger control in the energy and healthcare sectors."
Chambers Europe (2020)
Quote icon
"Marc Custers is 'highly experienced in competition law, and especially in merger control.' Further praised for his 'business-oriented' approach, he is also experienced in plaintiff cartel damages claims".
Chambers Europe (2019)
Quote icon
"Marc Custers impresses clients with his commercial approach. One interviewee notes: "He understands our business and provides us with pragmatic advice. He is smart and quick and his advice is always very helpful." His scope of expertise includes merger control notifications and cartel investigations and litigation."
Chambers Europe (2018)
Return to previous slide
Go to next slide