Mr Patrick Horan > Arthur Cox > Dublin, Ireland > Lawyer Profile

Arthur Cox
D02 T380

Work Department

Competition & Regulated Markets


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.


Law Society of Ireland; Law Society of England & Wales; Irish Society of European Law.


LLM, Trinity College Dublin, 2007; LLB, Trinity College Dublin, 2006; Admitted as a solicitor in Ireland, 2016; Admitted as a solicitor in England & Wales, 2010.

Lawyer Rankings

Ireland > EU and competition

(Next Generation Partners)

Patrick HoranArthur Cox

Arthur Cox has a fully rounded practice with an especially strong record in investigations, state aid and competition litigation. The firm remains at the forefront of merger control matters, including deals driven by private equity buyers. The firm has landed engagements in the vast majority of Ireland’s major competition investigations. Richard Ryan is head of competition and regulated markets at the firm, and has an outstanding reputation in state aid and competition investigations. He leads a team that represents an array of top domestic and international corporates. Patrick Horan is an emerging talent, as is senior associate Simon Breen.

Ireland > Telecoms

Arthur Cox is highly active in handling corporate transactions involving telecoms companies, acting on both the buy-side and sell-side of deals. Elsewhere in this sector, the team advises on the development of telecoms products as well as on regulatory issues. Key figures in the team include competition specialist Patrick Horan and Aaron Boyle, who focuses on infrastructure. The pair frequently work alongside the wider firm’s M&A and finance lawyers on telecoms matters.