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Pat Treacy


Pat Treacy

+44 (0)20 7400 8000

Pat has specialised in EU law and competition law for almost 30 years and has been involved in landmark cases at EU and national level.  In addition to her expertise across the range of competition law, she has particular strengths in advising on the complex legal and policy issues arising where competition law and intellectual property law intersect.  Consequently, clients in high technology sectors including life sciences and TMT seek her advice regularly.

Pat represents clients before the competition authorities and the courts, whilst also advising on competition law issues in complex agreements (including settlement, R&D and licensing agreements).  Pat advises many of the Firm's clients on the competition law responsibilities affecting dominant companies. She and her team assist clients with competition compliance programmes and preparation for "dawn raids", having supported clients through such dawn raids and their aftermath.  Pat is also a frequent commentator on the intersection of competition and IP law as featured in the blog The CLIP Board.

Pat is a member of the Competition Law Association; the UK Association of European Lawyers; and the Competition Section of the Law Society.  She is on the editorial board of the Journal of Intellectual Property Law and Practice and Competition Law Insight. Pat lectures and writes widely on topical issues. She also teaches the competition law module on the University of Oxford Postgraduate Diploma in Intellectual Property Law and Practice course.


  • MA Law, University of Cambridge
  • Qualified 1986
  • Admitted in Republic of Ireland (non-practising)
  • Partner 1996

Recommended for

  • Competition/ European Law: Non-contentious - Chambers and Partners (2017/2016/2015)
  • EU and Competition - Legal 500 (2016/2015/2014)
  • Competition litigation - Legal 500 (2016/2015/2014)
  • Pharmaceuticals and Biotechnology - Legal 500 (2016)
  • Media and entertainment - Legal 500 (2014)
  • Competition – Who’s Who Legal (2015/2014) 
  • Non IP Litigation / Competition & Antitrust - LMG UK Life Science Stars (2015/2014)
  • Competition & Antitrust - Women in Business Law (2015)
  • 6th and 4th Edition of Best Lawyers in the United Kingdom for Competition/Information Technology Law (2017/2015)
  • Competition & Antitrust - Super Lawyers UK (2014)

"Pat Treacy is described by clients as 'a fantastic lawyer: she has a good understanding of business dynamics, is always calm and collected and provides advice in a digestible way.' She acts on a broad range of competition law mandates, with particular expertise in matters at the intersect of IP and competition law." - Chambers and Partner 2017

"...competition expert Pat Treacy." Legal 500 2016

"Practice head Pat Treacy, who ‘skilfully translates the complexities of competition law into pragmatic legal advice’, advised Kimberly-Clark during an investigation launched by the Groceries Code Adjudicator." - Legal 500 2016

"Pat Treacy is the head of department at Bristows LLP and has particular knowledge of cases which span competition law and IP law. She has sector-specific knowledge within the life sciences and TMT sectors." - Chambers and Partners 2016

"Pat Treacy
 leads the practice at Bristows LLP, and wins praise for her ‘energetic and pragmatic approach’... Key clients include Google, Capgemini and Sony Computer Entertainment Europe." - Legal 500 2015

"Pat Treacy of Bristows LLP is 'particularly good at the very complicated overlap between intellectual property and competition.' She recently advised Google on High Court actions alleging search results discrimination."  - Chambers and Partners 2015

"Bristows LLP handles contentious issues at the interface of IP and competition law. Pat Treacy is commended for her ‘good strategic judgement'." - Legal 500 2014

"The ‘unflappable’ Pat Treacy leads the competition practice at Bristows LLP." - Legal 500 2014

"Peers say Pat Treacy of Bristows is 'extremely precise and very responsive'. Her knowledge of the technology sector means she continues to provide a significant amount of competition advice to Sony Computer Entertainment Europe." - Chambers and Partners 2014

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