William has extensive experience in a wide range of competition and regulatory matters.
He has been involved in several major cartel and other behavioural cases, including global antitrust investigations. He has also acted on several high-profile merger cases (including at Phase II) before the EU and UK competition authorities. In addition, he has significant experience in the field of competition litigation, including in appeals before the EU and UK courts.
Highlights include advising:
- FNZ on its acquisition of GBST
- Daily Mail and General Trust on its acquisition of the ‘i’, the UK national newspaper, and its print joint venture with News UK
- Diageo on its acquisition of Chase Distillery
- Redrow on its proposed combination with Barratt Developments
- Trafigura on its proposed acquisition of Greenergy
- Vodafone on various transactions, including its proposed joint venture with Three UK, the mergers of its Dutch business with that of Liberty Global, and its Indian business with that of Idea
- Compagnie Financière Richemont on the merger of Net-A-Porter and Yoox, and on its global strategic partnership with Alibaba and Farfetch
- Deutsche Bank in the context of the multiple investigations into the setting of interbank offered benchmark rates and associated competition litigation
William is ranked by Chambers for Competition Law and is recognised as a ‘Global Elite Thought Leader’ by Who’s Who Legal: Competition. He was shortlisted in the ‘Lawyer of the Year – Under 40’ category in the Global Competition Review awards in 2019 and 2022 and for Dealmaker of the Year in 2024.
William is the contributing editor of the Legal 500 cartels guide and has published numerous articles on a wide range of competition matters.
William is based in London, but spends a significant amount of his time in Brussels. He is a member of the Brussels Bar (A list), as well as being qualified as a solicitor (England and Wales).
Client testimonials:
"William Turtle is very client-friendly and in the details of what we do." Chambers UK 2025
"He can connect his knowledge to the realities and make the authorities understand." Chambers UK 2025
"He is the total package of being incredibly smart, very well-mannered and with strong strategic sense." Chambers UK 2024