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Global Leader

Competition 2019

Professional Biography

WWL Ranking: Recommended

WWL says

Philip Mansfield is a seasoned expert in competition law who is highly respected for his profound ability in merger and behavioural issues.


Philip Mansfield is a UK-qualified partner in Allen & Overy LLP's London antitrust group, who advises on EU and UK competition law matters and splits his time between the London and Brussels offices. He has led meetings with agencies around the world on merger, cartel and behavioural matters for various clients, including with the European Commission (EC), UK agencies, the US Department of Justice, the US Federal Trade Commission, the US Court of North California, the Korea Fair Trade Commission, the Japan Fair Trade Commission and China's Ministry of Commerce.

Philip regularly obtains approval for complex mergers and joint venture arrangements, particularly in the high-tech sector, and was a winner of the Global Competition Review Matter of the Year award in both 2011 and 2012 for merger-related cases. His experience includes advising Sun Microsystems on its acquisition by Oracle; Symantec Corporation on the antitrust issues of its US$13 billion merger with Veritas Software Corporation and its acquisition of Verisign; Micron on the acquisition of a joint controlling interest in Inotera and various other acquisitions; and Seagate on its acquisition of Samsung HDD and Xyratex. He has recently advised HP on its acquisition of Apogee, Cisco on the sale of its NDS business and GitHub on its sale to Microsoft.

Philip has extensive cartel experience and is a regular speaker at the signature IBA/ABA cartel conference. In 2016, Philip won the Global Competition Review Behavioural Matter of the Year award for the firm’s role on the European Commission’s credit defaults swap investigation. Matters include advising a party in the first EU settlement case (DRAM); as well as advising parties in each of the FX, Auto Parts, LCDCRT  Rubber ChemicalsEPDMHeat StabilisersGIS, and Power Transformer investigations. UK cases include the criminal and civil truck manufacturers’ investigation.  Over the past 5 years, Philip has also developed extensive experience in advising financial institutions on a number of cartel investigations and Financial Conduct Authority (FCA) market studies, including strategies surrounding the merits of making immunity/leniency applications to the UK Competition and Markets Authority and the EC, and engaging in settlement discussions with the EC. Philip recently successfully guided a major financial institution through the FCA’s first ever investigation brought using its competition enforcement powers. He is also currently advising clients on their defences to several separate follow-on damages actions before the English and German courts and has represented claimants in the English courts.

He has an established track record of representing companies in successfully raising and defending behavioural complaints before the EC and the UK courts relating to interoperability (Sun Microsystems/MicrosoftPSI/IBM), bundling (Microsoft/OperaMicrosoft/Vista), patent pools (PremaithaDVD6C/iODRA) and patent ambush (Micron/Rambus).

Allen & Overy's antitrust and competition practice comprises over 120 specialists operating across Asia, Australia, Europe and North America. The practice advises corporate clients and financial institutions on their global antitrust policies, litigation and regulatory strategies and has acted on some of the highest-profile and most complex cases in recent years.

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