Lukas Šimas advises large corporations and individuals on all aspects of EU competition and antitrust laws and related EU regulatory matters.

Mr. Šimas represents clients across a broad range of industries—electronics, energy, investment management, medical devices, pharmaceuticals and transportation—before the European Commission in complex merger proceedings and advises in global cartel proceedings (adverse and settlement procedures). He also advises on internal and government investigations.

Before joining Arnold & Porter in 2021, Mr. Šimas was an associate at another major US law firm in Brussels. Prior to that, he worked as a summer associate in a capital markets and derivatives department at an international law firm in London, and in a corporate and M&A department at a pan-Baltic legal boutique in Vilnius, Lithuania. He also worked as an in-house lawyer in the legal department of a medical devices distributor, where his work covered public procurement and antitrust issues.

While in law school, Mr. Šimas served as an associate editor for the Berkeley Technology Law Journal and earned the Berkeley Center for Law & Technology Certificate.


  • Pfizer in its $ 6.7 billion acquisition of Arena Pharmaceuticals before competition authorities worldwide.


  • MSc, Taxation, University of Oxford, Christ Church, 2022, Law Faculty Prize in Transfer Pricing
  • LLM, University of California, Berkeley, 2016, Best Written Brief Award
  • LLM, University College London, 2015
  • LLB, University of Exeter, 2014
  • Brussels, Belgium (EU-list)
  • New York
  • Roll of Solicitors in England and Wales
  • Roll of Solicitors in Ireland

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