Tomaž Ilešič

Tomaž Ilešič

Senior Partner

Fluent in:

English, Serbian, Croatian, French

Tomaž specialises in competition law, M&A, corporate and commercial law and legal practice related to life sciences.

Fluent in:

English, Serbian, Croatian, French

Tomaž has extensive experience in competition law and has advised in that field on several major corporate transactions undertaken by the firm. He has led defence teams in several attention-grabbing competition cases in front of national competition authority and European Commission.

He has developed a broad-based expertise through working with a range of major pharmaceutical companies. He focuses on representing clients in front of regulatory authorities and advises domestic and foreign clients.

Tomaž Ilešič has joined Rojs, Peljhan, Prelesnik & Partners in 2001 after his traineeship at Higher Court in Ljubljana.

Highlights include advising/representing

  • One of the largest retailers in region with respect to drafting and filing the notification for merger clearance
  • A pharmaceutical client in the deference in alleged cartel case before European Commission and in the proceedings in front of the General Court of the European Union by challenging the decision of the EU Commission finding that the client had infringed Article 101 of the TFEU
  • A Client in the competition proceedings and when applying for leniency and obtainment of full immunity given by the Competition Protection Office of Slovenia
  • The international producer of construction aggregates on contractual agreements between one of the client’s subsidiaries and its main customer from the perspective of competition law
  • Company, specialising in ecology, transport and engineering, on the tendering process for construction of the new medical unit in Slovenia
  • Two pharmaceutical companies in the proceedings related to the alleged participation in a cartel with respect to price fixing and market sharing, when supplying medical products for human use to public pharmacies
  • A company specialising in international electricity trading on drafting and filing a notification for obtaining merger clearance in the acquisition of an energy company
  • One of the largest tobacco companies in Eastern Europe on the copyright infringement and a trademark cancellation claim


  • State Bar Exam, 2001
  • Master of Arts in European Studies, College of Europe, 1998
  • Bachelor of Laws, University of Ljubljana, 1997


  • Rojs, Peljhan, Prelesnik & Partners, Partner since 2005
  • Rojs, Peljhan, Prelesnik & Partners, Associate and Senior Associate, 2001 – 2005
  • Higher Court in Ljubljana, Judicial Trainee, 2000 – 2001
  • Government of Slovenia, Office of Legislation, 1999 – 2000
  • Deloitte & Touche Ljubljana, 1998 – 1999


  • Co-author of the leading handbook on EU Law in Slovene language, Cankarjeva založba, 2002.
  • Co-author of the handbook “Legal aspects of association status of Slovenia”, Gospodarski vestnik, 2000.
  • Co-author of the Handbook on European Enlargement, T.M.C. Asser Institute, The Hague, 2003.
  • Co-author of the Lobbying in the European Union, Palgrave, 2002.
  • Co-author of the Guide to European Company Laws, 3rd edition, Sweet & Maxwell, 2007.
  • Numerous articles in the Slovenian law journals.


  • "The Best Young Lawyer of the year 2002 Award" awarded by the Slovene Lawyers’ Association