Home / People / Patrick Horan

Patrick is a partner in the Competition and Regulated Markets Group. His practice covers the full range of EU and Irish competition law.

Patrick advises clients on a wide range of competition and regulatory matters, including including merger control, investigations, State aid, competition law aspects of agreements, implementation of compliance programmes, and competition litigation. Prior to joining Arthur Cox in 2016, Patrick worked in the London and Brussels offices of Slaughter and May. Patrick is co-author of the Ireland chapters of the International Comparative Legal Guide to Competition Litigation and Merger Control, and in 2017 was named as one of the future leaders in competition law by Who’s Who Legal.

Relevant Experience

  • Advising AIB and First Data Corporation on the EU merger control aspects of their joint acquisition of Payzone Ireland
  • Advising Mediahuis NV in securing approval from the CCPC and the Minister for Communication for its €145.6 million acquisition of Independent News & Media plc
  • Advising Cognziant Technology Solutions Corporation on the Irish merger control aspects of its acquisition of Zenith Technologies
  • Advising LacPatrick Cooperative Society on its merger with Lakeland Dairies
  • Advising eir on the EU and Irish merger control and regulatory aspects of its acquisition by Xavier Niel
  • Advising undertakings in the motor insurance sector in connection with the ongoing investigations by the CCPC and the European Commission
  • Advising Accenture on the Irish merger control aspects of its acquisition of the Rothco Group
  • Advising Greenergy International on the EU merger control aspects of its acquisition of Inver Energy
  • Advising Volvo Trucks and Renault Trucks on its defence of follow-on damages actions in the Irish High Court arising from the European Commission’s decision in the Trucks cartel
  • Advising CRH plc in relation to the CCPC’s investigation in to the bagged cement sector in Ireland, as well as advising CRH in relation to its successful defence of the CCPC’s Supreme Court appeal against the decision of the High Court concerning a dawn raid conducted in May 2015


+353 1 920 1063

Ten Earlsfort Terrace
Dublin 2
D02 T380

  • LLM, 2007, Trinity College Dublin
  • LLB, 2006, Trinity College Dublin
  • Admitted as a solicitor in Ireland, 2016
  • Admitted as a solicitor in England & Wales, 2010
  • Member of the Law Society of Ireland
  • Member of the Law Society of England & Wales
  • Member of the Irish Society of European Law

“Patrick Horan is very impressive.”

The Legal 500: Europe, Middle East & Africa, 2021

Patrick Horan “understands the commercial context in which the advice is sought and is approachable, available and clear.”

Chambers Europe: Europe’s Leading Lawyers for Business, 2021

“Patrick Horan is tremendous to work with and the best competition lawyer we have worked with across Europe. His grasp of niche economic business matters with the law made us feel very comfortable.”

The Legal 500: Europe, Middle East & Africa, 2020

“Patrick Horan is exceptionally organised, hugely articulate and possesses the deep domain experience required to untangle the critical issues in a complex merger case. With Patrick, you get far more wisdom and experience than should make sense for his age.”

The Legal 500: Europe, Middle East & Africa, 2020