Marleen van den Horst

Marleen joined LGGA in 2023 as partner Intellectual Property & Technology and member of the Healthcare & Life Sciences sector group. Marleen has more than 25 years of experience in conducting complex (cross-border) proceedings on intellectual property. Specialised in patent law, she handles cases involving mechanical engineering, telecoms, electrical engineering, chemistry and life sciences. For example relating to ship shutters, floating solar panels, LTE & 4G/5G SEPs and FRAND issues. Marleen has achieved international recognition in the field of life sciences. In recent years, she has litigated and advised on patent/SPC and regulatory issues concerning medicinal products with active ingredients such as (es)omeprazole, alendronate, escitalopram, glatiramer acetate, trastuzumab, zoledronate, rivastigmine, ezetimibe+simvastatin, pemetrexed, sitagliptin, deferasirox, DMF, fingolimod and on CRISPR-Cas9 technology. Marleen advises clients in negotiating and drawing up e.g. licences and cooperation agreements.


  • Patent litigation in all fields of technology and strategic advice (national and UPC) 
  • Regulatory disputes and advice regarding medicinal products and medical devices

Professional activities

  • Marleen is a board member of the NeoKidney Foundation that focuses on the development of a portable artificial kidney (medical device). She provides pro bono advice on patent and other legal issues.
  • Marleen is a member of several professional organisations and trade associations, such as EPLAW, AIPPI, APAA, LES, VF&R and VIEPA.
  • She is frequently asked as a speaker at international conferences, such as ERA’s Annual EU Pharmaceutical law Conference, Fordham University’s Annual IP Conference, World IP Forum, LESI and EPLAW.


  • IP Stars from managing IP, Patent IP Star from Netherland 2023.
  • IAM Patent 1000, 2023: as patent litigator ranked in tier Gold: "Marleen is a stand-out practioner who dispenses sound legal knowledge backed up by solid commercial acumen. Her dedication and creativity are crucial to her clients achieving their dreams, and she truly goes above and beyond to help realise those goals." 
  • Legal 500, 2022: “With enthusiasm and skill, Marleen van den Horst clearly shows why she rightly belongs at the top in the Netherlands.”
  • Legal 500, 2022: “Working with Marleen van den Horst is a pleasant experience.”
  • Legal 500, 2022: “Marleen van den Horst is very pragmatic and strong on regulatory issues.”
  • Chambers Europe, 2022: “Clients appreciates that she is ‘straight to the point in addressing client needs’ and expands that she ‘doesn’t get lost in non-relevant things’.”


  • 2023, ‘Patents and Regulatory Data Exclusivity for Medicinal products’, Chapter 6 in: ‘Overlapping Intellectual Property Rights’, Oxford University Press, 2nd edition. (co-author Dr. Duncan Curley); 
  • 1989: Dissertation: 'Compensation for Improvements', VU University Press, Amsterdam. 
Contact details
M. (Marleen) van den Horst

Specialist Intellectual Property

Call: +31 172 530 250