Catriona Hatton is Co-Chair of the firm's Global Antitrust and Competition Law Group and a member of the firm's Executive Committee. She has over three decades of experience advising on EU and international merger control aspects of high-stakes global transactions, representing parties in many of the most high-profile, market-leading cases. Catriona is Senior Vice-Chair of the International Bar Association's Antitrust Section and co-editor of the leading IBA/Concurrences book on Gun Jumping in Merger Control, a multi-jurisdictional guide.

Outside of the merger area, Catriona has broad experience in advising clients on general compliance in their day-to-day business activities and representing defendants and complainants in investigations by the European Commission and national authorities including in connection with alleged infringements resulting from parallel imports, no poach and abuse of dominance. She advises clients in a number of sectors from mining, oilfield services and chemicals, to media and technology.

Recognised as one of the leading EU competition lawyers, she has been consistently ranked in Chambers Global and Chambers Europe since 2014 and 2013 respectively. She is named a Global Elite Thought Leader (2019) by Who's Who Legal and is recommended in the recent edition of Chambers Europe 2025 as a business-oriented practitioner and in Chambers Global 2025 where she is particularly praised for her commercial acumen and her work in international merger control.

The Legal 500 EMEA 2025 recognises Catriona as a Hall of Fame lawyer, a recognition extended to "lawyers at the very top of the profession, widely known and respected by peers and clients for their longstanding involvement in market-leading work."

She was named one of the leading "100 Women in Antitrust" by Global Competition Review in 2009, 2013, 2016, 2021 and 2025.

Catriona speaks English, Dutch, French and Italian.